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HomeMy WebLinkAboutTIMBERVINE - FDP - FDP140017 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER MANAGEMENT PLANSTORMWATER MANAGEMENT PLAN (SWMP) EROSION CONTROL REPORT Timbervine Fort Collins, Colorado Project Number SPHLV0001.01 Prepared for: Summerpark Holdings, LLC 1218 West Ash Street, Suite A Windsor, Colorado 80550 July 23, 2014 July 23, 2014 City of Fort Collins Stormwater Utility 700 Wood Street Fort Collins, CO 80521 Re: Stormwater Management Plan/Erosion Control Report - Timbervine Dear Staff, Galloway is pleased to submit this Stormwater Management Plan and Erosion Control Report for Timbervine. This report outlines Best Management Practices (BMPs) to be implemented with the proposed construction in order to minimize potential pollutants in stormwater discharges. This report is prepared to accompany the Colorado Department of Public Health and Environment (CDPHE) General Permit for Stormwater Discharge Associated with Construction Activities (i.e., Stormwater Discharge Permit or SDP). A copy of the issuance cover letter can be found in Appendix D of this document. The Stormwater Management Plan is not a static document - it is a dynamic device that should be kept current and logged as construction takes place. This initial plan was prepared to facilitate approvals and permitting, and may not reflect the final version, or the transitions throughout the construction process. The contractor is expected and encouraged to make changes while the site develops and changes, to allow the Stormwater Management Plan (SWMP) to work as effectively and efficiently as possible. It shall be the responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure the plan is properly maintained and followed. If you should have any questions or comments as you review this report, please contact Galloway at your convenience. Sincerely, Galloway James Prelog, PE Senior Civil Project Engineer JamesPrelog@gallowayUS.com Stormwater Management Plan/Erosion Control Report TABLE OF CONTENTS Vicinity Map 1.0 General Requirements ................................................................................................. 1 1.1 Objectives ...................................................................................................................... 1 1.2 SWMP Availability .......................................................................................................... 1 1.3 Definitions ...................................................................................................................... 1 1.4 Additional Permitting ....................................................................................................... 1 2.0 Narrative Site Description ............................................................................................ 2 2.1 Existing Site Description ................................................................................................. 2 2.2 Wind and Rainfall Erodibility | Sediment Migration Patterns ............................................. 2 2.3 Nature of Construction Activity ........................................................................................ 2 2.4 Sequence of Major Activities ........................................................................................... 2 2.5 Site Disturbance ............................................................................................................. 2 2.6 Existing Data .................................................................................................................. 3 2.7 Existing Vegetation ......................................................................................................... 3 2.8 Potential Pollution Sources ............................................................................................. 3 2.9 Non-Stormwater Discharges ........................................................................................... 4 2.10 Receiving Waters ........................................................................................................... 4 3.0 Stormwater Management Controls .............................................................................. 5 3.1 SWMP Administrator ...................................................................................................... 5 3.2 Best Management Practices (BMPs) for Stormwater Pollution Prevention ....................... 5 3.3 Structural Practices for Erosion and Sediment Control .................................................... 5 3.4 Non-Structural Practices for Erosion and Sediment Control ............................................. 7 3.5 Phased BMP Installation ............................................................................................... 10 3.6 Material Handling and Spill Prevention .......................................................................... 10 3.7 Vehicle Tracking Control ............................................................................................... 10 3.8 Waste Management and Disposal ................................................................................ 11 3.9 Groundwater and Stormwater Dewatering .................................................................... 11 4.0 Final Stabilization and Long-Term Stormwater Management................................... 12 4.1 Final Stabilization ......................................................................................................... 12 4.2 Long-Term Stormwater Management ............................................................................ 12 5.0 Inspection, Maintenance and Record Keeping.......................................................... 13 5.1 BMP Inspection ............................................................................................................ 13 5.2 BMP Maintenance ........................................................................................................ 13 5.3 Record Keeping ............................................................................................................ 13 6.0 Additional SWMP and BMP Resources ................................................................... 155 References 155 Stormwater Management Plan/Erosion Control Report APPENDICES: APPENDIX A – Site Maps APPENDIX B – Erosion Control Details APPENDIX C – Landscape Plan APPENDIX D – Copies of Permits/Applications APPENDIX E – Stormwater Management Plan Inspection Log APPENDIX F – Contractor Inserts (as needed) APPENDIX G – Erosion Control Cost Estimate Timbervine Stormwater Management Plan/Erosion Control Report 1 1.0 General Requirements 1.1 Objectives The objective of a Stormwater Management Plan (SWMP) is to identify the potential sources of pollution that result from construction activity, and describe the practices that will be used to reduce the pollutants in stormwater discharges from the site. The SWMP must be completed and implemented at the time the project breaks ground. The SWMP is a living document and must be revised as necessary during construction to accurately reflect the conditions and practices at the site. This report summarizes the Stormwater Management Plan for the construction activity that will occur with Timbervine (project site). This plan has been prepared according to regulations of the Colorado Department of Public Health and Environment (CDPHE), Water Quality Control Division. 1.2 SWMP Availability The report shall remain at the construction site to allow for maintenance and inspection updates and for review during inspection. 1.3 Definitions Best Management Practices (BMPs) – BMPs encompass a wide range of erosion and sediment control practices, both structural and non-structural in nature. BMPs are intended to remove or reduce potential water quality impacts from stormwater runoff. Erosion Control BMPs – The practices are intended to prevent the erosion of soil. Examples include: temporary stabilization, preserving existing vegetation and minimizing the amount of disturbed area through phasing. Sediment Control BMPs – These practices are designed to remove and reduce sediment from runoff. Examples include: straw wattles, silt fence and inlet protection. Non-structural BMPs – These BMPs prevent or limit the entry of pollutants into stormwater at their source through operational or managerial techniques. Examples include: preservation of natural vegetation, preventive maintenance and spill response procedures. Structural BMPs – Structural practices are designed to control on-site erosion and prevent sediment from migrating within the project site as well as off-site during construction. Examples include: diversion structures, inlet protection and silt fence. 1.4 Additional Permitting The Stormwater Management Plan is associated with the Colorado Department of Public Health and Environment (CDPHE) Stormwater Permit that is issued by the Water Quality Control Division of the CDPHE. Environmental permitting not described within this report would likely be required through separate documentation. Examples include the Construction Dewatering Permit for groundwater, and the Air Pollution Emission Notice (APEN). The CDPHE website contains links for these permits, along with many other potential permits. It is the contractors responsibility to ensuring that the proper permits are acquired. Timbervine Stormwater Management Plan/Erosion Control Report 2 2.0 Narrative Site Description 2.1 Existing Site Description The project site is located in the Northeast quarter of Section 7 and the Northwest quarter of Section 8, Township 7 North, Range 68 West of the 6th Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado. Timbervine is bordered to the north by the Burlington Northern Railroad, To the east by irrigation ditches; to the south by Industrial Business Park International P.U.D., and to the west by Dry Creek Minor Subdivision. 2.2 Wind and Rainfall Erodibility | Sediment Migration Patterns The project site is located within a Moderate Risk Wind Erodibility Zone per the City of Fort Collins Wind Erodibility Map. According to the Natural Resources Conservation Service website (www.websoilsurvey.nrcs.usda.gov), the applicable soil erodibility factor (K) is 0.20. This value is indicative of soils moderately susceptible to rainfall erosion. The long-term likelihood of erosion and sediment problems occurring on-site is minimal due to the landscaping and placement of impervious areas that will permanently stabilize the project site disturbed by proposed construction activity. During construction, the BMPs used onsite as described herein have been selected to prevent erosion and limit sediment migration. 2.3 Nature of Construction Activity The proposed Timbervine project will strip and grade the site to prepare the lots, swales roads and ponds. The proposed development will consist of single family units of varying size. Other proposed improvements include: a new asphalt and permeable Modular Block Paver (MBP) parking areas, a park, trails and landscaping. 2.4 Sequence of Major Activities To complete the project, basic construction activities will take place. The project will begin by stripping the site of topsoil and removing existing site improvements, followed by site grading where needed. The installation of utilities will occur next and includes: domestic water, sanitary sewer, storm sewer and underdrain systems. Upon completion of site grading and utility installation the expectation is that construction of some of the building foundations will begin along with concrete barrier curbs throughout the current phase of the project. Vertical construction of the building is expected to commence once the public infrastructure has been inspected by the City of Fort Collins (City). Permeable paver installation and fine grading of the areas around the buildings as well as landscaping throughout the project will mark the completion of construction activities on the site. 2.5 Site Disturbance The total area of the project site is 39.191 acres. The total area of the project to undergo disturbance is 37.275 acres. Site disturbance is expected to be uniform. At this time, the construction schedule of land disturbing activities is not available from the contractor. Timbervine Stormwater Management Plan/Erosion Control Report 3 2.6 Existing Data In order to complete the associated construction plans, a topographical survey of the site was completed by King Surveyors Inc. More site-specific exploration was performed by CTL Thompson, Inc. Detailed results from the site investigation is contained in the Geologic and Preliminary Geotechnical Investigation, Timberline Subdivision, Fort Collins, Colorado, (Project No. FC06508-115) dated April 28, 2014. 2.7 Existing Vegetation The existing ground cover consists of native grasses and a few scattered trees. The existing on- site runoff generally drains north-to-south across flat grades (e.g., <1.00%) to the Industrial park to the south and eventually to the swales in International Blvd. The pre-disturbance individual plant density is over 75 percent. The existing vegetative cover is consistent with a wet meadow environment. Final stabilization will include an individual plant density of at least 70 percent of pre-disturbance levels, or equivalent permanent, physical erosion reduction methods. Most of the total disturbed area will be permanently stabilized with asphalt, concrete, permeable Modular Block Pavers (MBPs) or roof area. The remaining area will be stabilized with landscaping such as sod and planting beds. It is highly recommended that pre- construction photos be taken to clearly document vegetative conditions prior any disturbance activities. 2.8 Potential Pollution Sources On most construction sites, there are a number of potential pollution sources which could affect water quality. It is not possible for this report to identify all materials that will be used or stored on the construction site. It is the sole responsibility of the contractor to identify and properly handle all materials that are potential pollution sources. The following are some common examples of potential pollution sources: x All disturbed and stored soils x Vehicle tracking of sediments x Management of contaminated soils x Loading and unloading operations x Outdoor storage activities (e.g., building materials, fertilizers, chemicals, etc.) x Vehicle and equipment maintenance and fueling x Significant dust or particulate generating processes x Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc. x On-site waste disposal practices (e.g., waste piles, liquid wastes, dumpsters, etc.) x Concrete truck/equipment washing, including the concrete truck chute and associated fixtures and equipment x Dedicated asphalt and concrete batch plants x Non-industrial waste sources such as worker trash and portable toilets x Other areas or procedures where potential spills can occur Management of Contaminated Soils: We are not aware of on-site contaminated soils. However, the contractor should conduct a thorough, pre-construction environmental site assessment. If contaminated soils are discovered, the contractor will identify appropriate practices and procedures for the specific contaminants discovered on-site. Timbervine Stormwater Management Plan/Erosion Control Report 4 Loading and Unloading Operations: During site demolition, material loading and unloading will occur on-site. As site development and building construction progresses, space constraints will limit the number of on-site locations for loading and unloading activities. The contractor will be responsible for the proper handling and management of pollution sources during loading and unloading operations. Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt or concrete batch plant will be constructed on-site. 2.9 Non-Stormwater Discharges The Stormwater Construction Permit only covers discharges composed entirely of stormwater. Emergency firefighting water is the only authorized exception. Concrete Washout water can NOT be discharged to surface waters or to storm sewer systems without separate permit coverage. The discharge of Concrete Washout water to the ground, under specific conditions, may be allowed by the Stormwater Construction Permit when appropriate BMPs are implemented. Construction Dewatering water can NOT be discharged to surface waters or to storm sewer systems without separate permit coverage. The discharge of Construction Dewatering water to the ground, under specific conditions, may be allowed by the Stormwater Construction Permit when appropriate BMPs are implemented. The discharge of pumped stormwater, ONLY, from excavations, ponds, depressions, etc., to surface waters, or to a municipal separate storm-sewer system (MS4) is allowed by the Stormwater Construction Permit, as long as the dewatering activity and associated BMPs are identified in the SWMP (including location of the activity), and BMPs are implemented in accordance with the SWMP. 2.10 Receiving Waters Stormwater runoff from the project area will generally sheet flow into a system of roof drains and swales and roadways that are connected to swales (grass to the west and a PLD swale to the east) ending up in the 2 connected detention ponds to the south. The outlet will release into a storm system that runs to the existing detention within International Blvd. That detention will be released to an off-site swale that runs to Dry Creek and eventually ends up in the Poudre River. The proposed drainage patterns are generally consistent with existing drainage patterns. Timbervine Stormwater Management Plan/Erosion Control Report 5 3.0 Stormwater Management Controls 3.1 SWMP Administrator A SWMP Administrator must be designated in conjunction with the Stormwater Permit. This person shall be responsible for developing, implementing, maintaining and revising the SWMP. The SWMP Administrator will also be the contact for all SWMP-related issues and will be the person responsible for the accuracy, completeness and implementation of the SWMP. The Administrator should be a person with authority to adequately manage and direct day-to-day stormwater quality management activities at the site. The SWMP Administrator for this site is: Name: Company: Phone: E-mail: 3.2 Best Management Practices (BMPs) for Stormwater Pollution Prevention Best Management Practices (BMPs) are defined as a method, activity, maintenance procedure or other management practice for reducing the amount of pollution entering a water body. The term originated from rules and regulations in Section 208 of the Clean Water Act. Beginning with mobilization, and throughout the entire construction of the buildings, erosion control devices shall be installed and maintained to minimize pollutant migration. The BMPs may be installed or implemented in phases, or not at all, depending on actual conditions encountered at the site. It is the responsibility of the contractor to make the determination as to what practices should be employed and when. In the event that a review agency deems BMPs to be insufficient, it shall be the responsibility of the contractor to implement modifications as directed. The Erosion Control Exhibit (Refer to sheet EC1 in Appendix A) illustrates the initial placement and assumed location for each of the BMPs. Details for recommended BMPs are included in Appendix A. The details should be used for additional information on installation and maintenance of BMPs described herein. Details for Structural and Non-Structural BMPs have been included in Appendix B. These details should be used for additional information on installation and maintenance of BMPs specified in this report. It is also intended to serve as a resource for additional BMPs that may be appropriate for the site that have not specifically been mentioned in the report. 3.3 Structural Practices for Erosion and Sediment Control Structural BMPs are physical devices that prevent or minimize water quality impacts associated with construction site stormwater runoff. These devices can be temporary or permanent, and the installation of individual components will vary depending on the stage of construction. A table depicting the construction sequence and BMPs been placed on the Erosion Control Plan to help document the implementation of these BMPs. Refer to the Erosion Control Plan in the Appendix A for the assumed location of all BMPs. Construction Details for Temporary BMPs are located in Appendix A for reference. Again, the final determination of which BMPs will be installed, where they will be located and when they will be installed shall be made by the contractor, along with all documentation throughout the construction process. Timbervine Stormwater Management Plan/Erosion Control Report 6 Silt Fencing (Phases I - IV) Silt fencing shall be provided to prevent migration of sediment off-site into the public right- of-way or onto adjacent properties. All silt fencing shall be installed prior to any land disturbing activity (i.e., stockpiling, stripping, grading, excavation, earthwork activities, etc.). The silt fence inspections should identify tears or holes in the material as well as check for slumping fence or undercut areas that allow flows to bypass the fencing. The damaged sections of fencing should be repaired or replaced. Sediment accumulations equal to or greater than 6 inches behind the silt fence should be removed to maintain BMP effectiveness. At a minimum, it is suggested that silt fencing shall be located along the south property line and east along the irrigation ditch and down the easement boundary of Mexico Way to prevent sediment from leaving the site and entering the neighboring property and adjacent irrigation ditch. Sediment Control Log – aka “Straw Wattles” (Phases I - IV) A Sediment Control Log (SW) is a linear roll made of natural materials, such as straw, coconut fiber or other fibrous material trenched into the ground and anchored with a wooden stake. Sediment Control Logs can be used as perimeter control for stockpiles, as check dams in small drainage ways (e.g., swales) or on disturbed slopes to shorten flow lengths. If the wattles are weighted, they can be used as part of an inlet protection design. Sediment Control Logs should be inspected for excess sediment accumulation. The sediment should be removed prior to reaching half the height of the log. At a minimum, Sediment Control Logs should be used around soil stockpiles and within the proposed swales along the east and west sides of the site. Vehicle Tracking Control Pad (Phases I - II) A Vehicle Tracking Control (VTC) pad shall be provided to minimize tracking of mud and sediment onto paved surfaces and neighboring roadways. The vehicle tracking control pad shall be installed prior to any land disturbing activity (e.g., stockpiling, stripping, grading, etc.). The vehicle tracking control pad should be located at any and all existing and future vehicle accesses being used during any of the construction phases. These locations will primarily be dictated by gates or openings in the temporary construction fencing. Vehicle tracking pads should be inspected for degradation. The aggregate material should remain rough and be replaced if the area becomes clogged with water and/or excess sediment. The current plan shows a two vehicle tracking control pads at Mackinac Street and Mexico Way. Curb Inlet Protection (Phases I - IV) Curb inlet protection shall be provided to prevent sediment transport from adjacent earthwork disturbance. If pavement is constructed adjacent to the inlets or if the area adjacent to the inlet is changed such that the wattle type filter is no longer effective, it shall be the responsibility of the contractor to ensure that an appropriate method is used Timbervine Stormwater Management Plan/Erosion Control Report 7 instead. For example, the wattle filter could be reused, or a gravel-block inlet filter may be installed. Area Inlet Protection (Phases I - IV) Inlet protection (IP) should be inspected regularly for tears that can result in sediment entering an inlet. Inlet protection should also be inspected for sediment accumulation upstream of the inlet. Area inlet protection is proposed at each of the alley inlets. Rock Socks (Phases I - IV) Rock socks are proposed along the north and south curbline of Mackinac Street to reduce the velocity of water leaving the project site and introduce another opportunity for sediment removal. Rock sock heights should allow for pools to develop upstream, creating minor backwaters to both reduce velocities and to allow sediment deposition. The rock socks should be spaced so that the top of each dam is equal in elevation to the toe of the next upstream rock sock. Rock socks should be inspected regularly for gaps or holes which would allow water to pass through. Concrete Washout Area (Phases II - III) A concrete washout area should be provided on the site. The washout can be a lined or unlined excavated pit in the ground, a commercially manufactured prefabricated container or an aboveground holding area. The concrete washout area must be located a minimum of 400 feet from any natural drainage way or body of water and at least 1000 feet from any wells or drinking water sources. If not lined, the concrete washout area should not be located in an area where shallow groundwater may be present. The contractor shall clearly show the desired location and access to the Concrete Washout Area on the Stormwater Management Plan - Dynamic Site Plan. The contractor shall place a Vehicle Tracking Pad if the selected location for the Concrete Washout Area is detached from pavement. Clear signage identifying the concrete washout should also be provided. The Concrete Washout Area should be inspected regularly with particular attention being paid to signage to ensure that the area is clearly marked. Confirmation that the washout is being used should also be noted to ensure that other undesignated areas of the site are not being used incorrectly as a concrete washout. Permanent/Established Vegetation (Phase IV) Permanent or established vegetation and landscaping is considered a permanent form of sediment and erosion control. Areas where the previous conditions apply will contain sufficient permanent BMPs such as sod or landscape material (e.g., smooth river rock/cobble and wood mulch). 3.4 Non-Structural Practices for Erosion and Sediment Control Non-Structural BMPs are practices or activities that are implemented to prevent erosion from happening or to limit erosion once it occurs. These BMPs can be a practice resulting in a physical change to the site, such as mulching or slope stabilization. They can also result in behavioral changes on the site, such as changes to construction phasing to minimize exposure to weather elements or increased employee awareness gained through training. Timbervine Stormwater Management Plan/Erosion Control Report 8 Protection of Existing Vegetation (Phases I - IV) Protection of existing vegetation on a construction site can be accomplished through installation of a construction fence around the area requiring protection. In cases where upgradient areas are disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas such as wetlands. Trees that are to remain after construction is complete must also be protected. Most tree roots grow within the top 12”-18” of soil, and soil compaction is a significant threat to tree health. As such, particular care should be taken to avoid activities within the drip-line of the tree. Direct equipment damage should also be prevented. The most effective way to ensure the health of trees is to establish a protection zone at the drip-line of the tree. Fencing should be inspected and repaired as needed. If damage occurs to a tree, an arborist should be consulted. If a tree is damage beyond repair, the City Forester should be consulted on remediation measures. Stockpile Management (Phases I - IV) Stockpile management should be utilized to minimize erosion and sediment transport BMPs should be placed around the perimeter of the stockpile, and a designated from soil stockpiles. In general, soil stockpiles should be located a minimum of 100 feet from any drainage way and 50 feet from any storm sewer inlets. Where practical, choose a stockpile location that will remain undisturbed for the longest period of time as the phases of construction progress. Sediment control access point on the upstream side of the stockpile should be identified. BMPs such as surface roughening, temporary seeding, mulching, erosion control blankets or soil binders should be used to stabilize the stockpile surface. As a part of stockpile management, regular inspections of the perimeter controls should be completed. If BMPs have been utilized to stabilize the surface of the stockpile, which is usually true for stockpiles that sit longer than 30 days, they should be inspected and repaired as needed. Mulching (Phases I - IV) Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration and reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it can also be used for temporary stabilization of areas that cannot be reseeded due to seasonal constraints. The most common type of mulch used is hay or grass that is crimped into the soil to keep it secure. The Contractor shall mulch all planted areas within twenty-four (24) hours after planting. Only weed-free and seed-free straw mulch may be used. Straw mulch should be applied at two (2) tons per acre, and shall be adequately secured by crimping, tackifier, netting or blankets. Hydraulic mulching may also be used on steep slopes or where access is limited. In the case that hydraulic mulching is utilized, the contractor shall use wood cellulose fibers mixed with water at two thousand to two thousand five hundred (2,000- 2,500) pounds per acre and organic tackifier at one hundred to four hundred (100-400) pounds per acre. Wind Erosion/Dust Control (Phases I - IV) Wind Erosion and Dust Control BMPs help to keep soil particles from entering the air as a result of land disturbing construction activities. Examples include the use of a water truck Timbervine Stormwater Management Plan/Erosion Control Report 9 or irrigation/sprinkler system to wet the top layer of disturbed soil, seeding and mulching, soil binders or wind fences. If a water truck or irrigation/sprinkler system is utilized, then monitoring for sufficient water application is crucial to ensuring soil particles don’t become airborne. Equally important is monitoring for overwatering, as too much water can lead to increased erosion and sediment laden construction site runoff. Good Housekeeping Practices (Phases I - IV) Good housekeeping practices that will prevent pollution associated with solid, liquid and hazardous construction-related materials and wastes should be implemented throughout the project. Examples of good housekeeping include providing an appropriate location for waste management containers, establishing proper building material staging areas, designating paint and concrete washout areas and establishing proper equipment/vehicle fueling and maintenance practices. Development of a spill prevention and response plan is another example of Good Housekeeping practices that should be used on the project. Street Sweeping and Vacuuming – Street sweeping and vacuuming should be used to remove sediment that has been tracked onto adjacent roadways. Roadways should be inspected at least once a day, and sediment should be removed as needed. A check of inlet protection should be completed after sweeping to ensure nothing was displaced during sweeping operations. Waste Management – Designate trash and bulk waste collection areas on-site. When possible, materials should be recycled. Hazardous material waste should be segregated from other solid waste. Waste collection areas should be located away from streets, gutters, watercourses and storm drains. Dumpsters should be located near site entrances to minimize traffic on disturbed soils, and they should be placed on a level soil surface. Establish Proper Building Material Handling and Staging areas – Clearly designate site areas for staging and storage of building materials. Provide appropriate BMPs to ensure that spills or leaks are contained. Establish Proper Equipment/Vehicle Fueling and Maintenance Practices – If needed, create a clearly designated on-site fueling and maintenance area that is clean and dry. Provide appropriate BMPs to ensure that spills or leaks are contained. Saw Cutting Pollution Prevention (Phase II) The following protocol is recommended to prevent dust and slurry from asphalt and concrete saw cutting activities from migrating into the existing storm drain system. - Slurry and cuttings shall be vacuumed during cutting and surfacing operations - Slurry and cuttings shall not remain on permanent concrete or asphalt pavement overnight - Slurry and cuttings shall not drain to any natural or constructed drainage conveyance - Collected slurry and cuttings shall be disposed of in a manner that does not violate groundwater or surface water standards Timbervine Stormwater Management Plan/Erosion Control Report 10 3.5 Phased BMP Installation It is important to recognize the four (4) major Development Phases as defined by the State of Colorado’s Stormwater Discharge Permit (SDP). These four development phases, which are referred to as sequencing by the City of Fort Collins, have been distinguished to aid in the appropriate timing of installation/implementation of BMPs at different stages of the construction process. These phases are described as follows: Phase I – Grading Stage; BMPs for initial installation of perimeter controls Phase II – Infrastructure Stage; BMPs for utility, paving and curb installation Phase III – Vertical Construction Stage; BMPs for individual building construction. Phase IV – Permanent BMPs and final site stabilization. 3.6 Material Handling and Spill Prevention Potential pollution sources, as discussed in earlier sections, are to be to be identified by the contractor. Spill prevention procedures are to be determined and put in place prior to construction by the contractor. A spill and flooding response procedure must also be determined and put in place prior to construction by the contractor. Additionally, steps should be taken to reduce the potential for leaks and spills coming into contact with stormwater runoff. A notification procedure must be put in place by the contractor, by which workers would first notify the site construction superintendent, who would then notify the SWMP Administrator. Depending on the severity of the spill, the site construction superintendent and SWMP Administrator would possibly notify the Colorado Department of Public Health and Environment - Water Quality Control Division, downstream water users or other appropriate agencies. The release of any chemical, oil, petroleum product, sewage, etc., which enter waters of the State of Colorado (which include surface water, ground water, and dry gullies or storm sewers leading to surface water) must be reported immediately to the Division’s emergency spill reporting line at (877) 518-5608. All spills that will require cleanup, even if the spill is minor and does not need to be reported to the state, should still be reported to the City Utilities office at 970-221- 6700. While not expected with this project, it will be the responsibility of the contractor to designate a fueling area and take the necessary precautions to ensure that no stormwater pollution occurs in the event that a fueling area is needed. Fueling areas shall be located a minimum 100 feet from all drainage courses. A 12-inch high compacted earthen berm capable of retaining potential spills shall enclose fueling areas. Other secondary containment devices can be used instead of the earthen berm. The area shall be covered with a non-porous lining to prevent soil contamination. Printed instructions for cleanup procedures shall be posted in the fueling area and appropriate fuel absorbents shall be available along with containers for used absorbents. 3.7 Vehicle Tracking Control In addition to the vehicle tracking pads discussed previously, additional measures can be taken to minimize and control sediment discharges from the site due to vehicle tracking. These measures can include fencing around the site to control access points. Regular street sweeping can also be used to minimize the transmission of sediment from the site due to vehicles leaving the site. The use of gravel parking areas and wash racks can also be implemented to ensure minimal vehicle tracking from the site. Minimizing or limiting the number of vehicles accessing the site by Timbervine Stormwater Management Plan/Erosion Control Report 11 providing designated delivery areas, or by restricting deliveries when the site is muddy is also encouraged. 3.8 Waste Management and Disposal It will be the responsibility of the contractor to designate a concrete truck chute washout area and to clearly identify that area. Detailed information about the design and maintenance of the Concrete Washout can be found under the Structural Practices section of this report. At no time should untreated wash water be allowed to discharge from the site or to enter a storm drain system or stream. Upon completion of construction activities the concrete washout material shall be removed and properly disposed of prior to the area being restored. Any waste material that currently exists on the site or that is generated by construction will be disposed of in such a manner as to not cause pollutants in stormwater discharges. If waste is to be stored on-site, it shall be in an area located a minimum of 100 feet from all drainage courses. Whenever waste is not stored in a non-porous container, it shall be in an area enclosed by a 12- inch high compacted earthen berm or some other approved secondary containment device. The area shall be covered with a non-porous lining to prevent soil contamination. Whenever precipitation is predicted, the waste shall be covered with a non-porous cover and anchored on all sides to prevent its removal by wind. On-site waste disposal practices, such as dumpsters, should be covered or otherwise contained as to prevent dispersion of waste materials by wind. It shall also be the responsibility of the contractor to maintain a clean jobsite and to prevent the dispersion of waste material and potential pollutants into adjacent properties or waterways. The location of, and protective measures for, temporary restroom facilities shall be the responsibility of the SWMP Administrator. 3.9 Groundwater and Stormwater Dewatering The BMPs selected for construction dewatering vary depending on the site-specific features, such as soils, topography, discharge quantities and discharge location. Typically, dewatering involves pumping water from an inundated area to a BMP, prior to the water being released downstream into a receiving waterway, sediment basin, or well-vegetated area. Acceptable BMPs included discharging water into a sediment trap or basin, using a dewatering filter bag or using a series of sediment logs. A settlement tank or an active treatment system can also be utilized as long as it is not a chemically induced treatment system. Another commonly used method to handle the pumped water is the “sprinkler method,” which involves applying the water to vegetated areas through a perforated discharge hose. Dispersal from a water truck for dust control can also be used to disperse the pumped water. Timbervine Stormwater Management Plan/Erosion Control Report 12 4.0 Final Stabilization and Long-Term Stormwater Management 4.1 Final Stabilization All disturbed areas will be seeded, crimped and mulched. Soil amendments such as compost, peat, aged manure, or other similar materials, shall also be utilized. Soil amendments shall be tilled into the soil to a minimum depth of 6”, and should comply with the requirements found in City Code Section 12-132 (refer also to Land Use Code 3.8.21). As defined by the Colorado Department of Public Health and Environment (CDPHE) in the General Permit Application for Stormwater Discharges, “Final stabilization is reached when all soil disturbing activities at the site have been completed, and uniform vegetative cover has been established with a density of at least 70 percent of pre-disturbance levels or equivalent permanent, physical erosion reduction methods have been employed.” Table 1 – Native Grass Seed Mix Preferred Varieties Seeded Rate (lbs. per acre, drilled) PLS Seeded/acre Leymus Cinereus Great Basin Wilrye Mangar 3 285,000 Nassella Viridula Green Needlegrass Lodorm 2 362,000 Chnatherum Hymenoides Indian Ricegrass Paloma, Nezpar 1 188,000 Elymus Trachycaulus Slender Wheatgrass Primar, Revenue 2 320,000 Elymus Lanceolatus Thickspike Wheatgrass Critana 3 580,500 Pascopyrum Smithii Western Wheatgrass Arriba, Barton 4 504,000 Totals 15 2,239,500 Species 4.2 Long-Term Stormwater Management The primary method of long-term stormwater management will be a developed site mostly comprised of rooftops roads and drives. Landscaping will also occur within the ponds, swales and parks. Timbervine Stormwater Management Plan/Erosion Control Report 13 5.0 Inspection, Maintenance and Record Keeping 5.1 BMP Inspection All temporary erosion control facilities shall be inspected at a minimum of once every two (2) weeks and after each significant storm event or snowmelt. Repairs or reconstruction of BMPs, as necessary, shall occur as soon as possible in order to ensure the continued performance of their intended function. It is the responsibility of the SWMP Administrator to conduct bi-weekly inspections, maintain BMPs if needed, keep records of site conditions and inspections and to update the SWMP as necessary. The construction site perimeter, disturbed areas, all applicable/installed erosion and sediment control measures and areas used for material storage that are exposed to precipitation shall be inspected for evidence of, or the potential for, pollutants entering the drainage system. Erosion and sediment control measures identified in the SWMP shall be observed to ensure that they are operating correctly. Particular attention should be paid to areas that have a significant potential for stormwater pollution, such as demolition areas, concrete washout locations and vehicle entries to the site. The inspection must be documented to ensure compliance with the permit requirements. 5.2 BMP Maintenance BMPs not operating in accordance with the SWMP must be addressed as soon as possible to prevent the discharge of pollutants. If modifications are necessary, such modifications shall be documented so that the SWMP accurately reflects on-site conditions. The SWMP needs to accurately represent field conditions at all times. Uncontrolled releases of mud, muddy water or measurable amounts of sediment found off-site will be recorded with a brief explanation of the measures taken to clean-up the sediment that has left the site, as well as the measures taken to prevent future releases. This record shall be made available to the appropriate public agencies (Colorado Department of Public Health and Environment, Water Quality Control Division; Environmental Protection Agency; City of Fort Collins; etc.) upon request. Preventative maintenance of all temporary and permanent erosion control BMPs shall be provided in order to ensure the continued performance of their intended function. Temporary erosion control measures are to be removed after the site has been sufficiently stabilized as determined by the City of Fort Collins. Maintenance activities and actions to correct problems shall be noted and recorded during inspections. Inspection and maintenance procedures specific to each BMP identified with this SWMP are discussed in Section 3. Details have also been included with Appendix B. 5.3 Record Keeping Documentation of site inspections must be maintained. The following items are to be recorded and kept with the SWMP: x Date of Inspection x Name(s) and title(s) of personnel making the inspection x Location(s) of sediment discharges or other pollutants from the site x Location(s) of BMP’s that need to be maintained x Location(s) of BMP’s that failed to operate as designed or proved inadequate x Locations(s) where additional BMP’s are needed that were not in place at the time of inspection Timbervine Stormwater Management Plan/Erosion Control Report 14 x Deviations from the minimum inspection schedule x Descriptions of corrective action taken to remedy deficiencies that have been identified x The report shall contain a signed statement indicating the site is in compliance with the permit to the best of the signer’s knowledge and belief after corrective actions have been taken. Provided within Appendix E of this SWMP is an Example Inspection Log to aid in the record keeping of BMP inspections and maintenance. Photographs, field notebooks, drawings and maps should be included when appropriate. In addition to the Inspection Log, records should be kept documenting: x BMP maintenance and operation x Stormwater contamination x Contacts with suppliers x Notes on the need for and performance of preventive maintenance and other repairs x Implementation of specific items in the SWMP x Training events (given or attended) x Events involving materials handling and storage x Contacts with regulatory agencies and personnel x Notes of employee activities, contact, notifications, etc. Records of spills, leaks or overflows that result in the discharge of pollutants must be documented and maintained. A record of other spills that are responded to, even if they do not result in a discharge of pollutants, should be made. Information that should be recorded for all occurrences includes the time and date, weather conditions, reasons for the spill, etc. Some spills may need to be reported to authorities immediately. Specifically, a release of any chemical, oil, petroleum product, sewage, etc., which may enter waters of the State of Colorado (which include surface water, ground water and dry gullies or storm sewers leading to surface water) must be reported to the CDPHE. Additionally, the “Dynamic Site Plan” is intended to be a “living document” where the SWMP Administrator can hand write the location of BMPs as they are installed to accurately reflect the current site conditions. Also on the “Dynamic Site Plan” should be a “Table of Construction Sequence and BMP Application/Removal” that the SWMP Administrator can use to document when BMPs were installed or removed in conjunction with construction activities. These items will be included as an aid to the SWMP Administrator, and other methods of record keeping are at his or her discretion. The Stormwater Management Plan (both the text and map) is not a static document, it is a dynamic device intended to be kept current and logged as construction takes place. It shall be the responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure the plan is properly maintained and followed. Diligent administration is critical, including processing the Notice to Proceed and noting on the Stormwater Management Plan the dates that various construction activities occur and respective BMPs are installed and/or removed. Timbervine Stormwater Management Plan/Erosion Control Report 15 6.0 Additional SWMP and BMP Resources Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual - Volume 3 “Best Management Practices” Colorado Department of Transportation Erosion Control and Stormwater Quality Guide BMP Field Academy EPA Menu of BMP’s Construction Site Storm Water Runoff Control International Stormwater Best Management (BMP) Database Rocky Mountain Education Center Rocky Mountain Education Center Red Rocks Community College, Lakewood Keep It Clean Partnership Boulder References 1. Final Drainage Report for The Carriage House Apartments, Northern Engineering Services, May 29, 2013 (NES Project No. 620-002) 2. Geotechnical Engineering Study and Pavement Thickness Design Proposed Student Apartment Development 1305 and 1319 South Shields Avenue Fort Collins, Colorado, December 13, 2012, Kumar and Associates, Inc. (Project No. 12-1-517). 3. Soil Resource Report for Larimer County Area, Colorado, Natural Resources Conservation Service, United States Department of Agriculture. 4. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood Control District, Water Resources Publications, LLC., Denver, Colorado, Updated November 2010. Appendix A (Site Maps) Appendix B (Erosion Control Details) Chapter 7 Construction BMPs November 2010 Urban Drainage and Flood Control District 7-13 Urban Storm Drainage Criteria Manual Volume 3 Final Stabilization ▪ Revegetate Site ▪ Activate Post Construction BMPs (e.g., convert sediment basin to extended detention basin) ▪ Remove Temporary BMPs ▪ Closeout State and Local Stormwater Permits Construction Phase Representative Phases: ▪ Clearing and Grubbing ▪ Rough Grading ▪ Road Construction ▪ Utility and Infrastructure Installation ▪ Vertical Construction (Buildings) ▪ Final Grading Management Practices: ▪ Phase Construction Activities to Minimize Disturbed Area at a Given Time ▪ Sequence Contruction within Phases to Avoid Idle Disturbed Areas ▪ Install, Inspect and Proactively Maintain BMPs Appropriate for Each Phase of Construction ▪ Maintain and Update SWMP as Construction Progresses Pre-Construction ▪ Develop Site Plan ▪ Obtain Site Survey, Hydrology and Soils Information ▪ Prepare SWMP ▪ Obtain Stormwater Construction Permits (State and Local) ▪ Obtain Other Relevant Permits (e.g., 404 , Floodplain, Dewatering) Figure 7-2. Construction Stormwater Management Construction BMPs Construction BMPs 7-14 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Functions Erosion Control Sediment Control Site/Material Management Surface Roughening Yes No No Temporary/Permanent Seeding Yes No No Soil Binders Yes No Moderate Mulching Yes Moderate No Compost Blankets and Filter Berms Yes Moderate No Rolled Erosion Control Products Yes No No Temporary Slope Drains Yes No No Temporary Outlet Protection Yes Moderate No Rough Cut Street Control Yes Moderate No Earth Dikes / Drainage Swales Yes Moderate No Terracing Yes Moderate No Check Dams Yes Moderate No Streambank Stabilization Yes No No Wind Erosion / Dust Control Yes No Moderate Silt Fence No Yes No Sediment Control Log Moderate Yes No Straw Bale Barrier No Moderate No Brush Barrier Moderate Moderate No Rock Sock (perimeter control) No Yes No Inlet Protection (various forms) No Yes No Sediment Basins No Yes No Sediment Traps No Yes No Vegetative Buffers Moderate Yes Yes Chemical Treatment Moderate Yes No Concrete Washout Area No No Yes Stockpile Management Yes Yes Yes Good Houskeeping (multiple practices) No No Yes Construction Phasing Moderate Moderate Yes Protection of Existing Vegetation Yes Moderate Yes Construction Fence No No Yes Vehicle Tracking Control Moderate Yes Yes Stabilized Construction Roadway Yes Moderate Yes Stabilized Staging Area Yes Moderate Yes Street Sweeping / Vacuuming No Yes Yes Temporary Diversion Channel Yes No No Dewatering Operations Moderate Yes Yes Temporary Stream Crossing Yes Yes No Temporary Batch Plants No No Yes Paving and Grinding Operations No No Yes Site Management and Other Specific Practices Sediment Control BMPs Erosion Control BMPs Materials Management Table 7-2. Overview of Construction BMPs Surface Roughening (SR) EC-1 November 2010 Urban Drainage and Flood Control District SR-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SR-1. Surface roughening via imprinting for temporary stabilization. Description Surface roughening is an erosion control practice that involves tracking, scarifying, imprinting, or tilling a disturbed area to provide temporary stabilization of disturbed areas. Surface roughening creates variations in the soil surface that help to minimize wind and water erosion. Depending on the technique used, surface roughening may also help establish conditions favorable to establishment of vegetation. Appropriate Uses Surface roughening can be used to provide temporary stabilization of disturbed areas, such as when revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls. Surface roughening is often implemented in conjunction with grading and is typically performed using heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are better surface roughening techniques in locations where revegetation is planned. Roughening is not effective in very sandy soils and cannot be effectively performed in rocky soil. Design and Installation Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and SR-2, respectively. Surface roughening should be performed either after final grading or to temporarily stabilize an area during active construction that may be inactive for a short time period. Surface roughening should create depressions 2 to 6 inches deep and approximately 6 inches apart. The surface of exposed soil can be roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or tilling. Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be roughened as a subsequent operation. Roughening should follow along the contours of the slope. The tracks left by truck mounted equipment working perpendicular to the contour can leave acceptable horizontal depressions; however, the equipment will also compact the soil. Surface Roughening Functions Erosion Control Yes Sediment Control No Site/Material Management No EC-1 Surface Roughening (SR) SR-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Maintenance and Removal Care should be taken not to drive vehicles or equipment over areas that have been surface roughened. Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies. Because surface roughening is only a temporary control, additional treatments may be necessary to maintain the soil surface in a roughened condition. Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not provide long-term erosion control. Surface Roughening (SR) EC-1 November 2010 Urban Drainage and Flood Control District SR-3 Urban Storm Drainage Criteria Manual Volume 3 EC-1 Surface Roughening (SR) SR-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Temporary and Permanent Seeding (TS/PS) EC-2 November 2010 Urban Drainage and Flood Control District TS/PS-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of Douglas County. Description Temporary seeding can be used to stabilize disturbed areas that will be inactive for an extended period. Permanent seeding should be used to stabilize areas at final grade that will not be otherwise stabilized. Effective seeding includes preparation of a seedbed, selection of an appropriate seed mixture, proper planting techniques, and protection of the seeded area with mulch, geotextiles, or other appropriate measures. Appropriate Uses When the soil surface is disturbed and will remain inactive for an extended period (typically 30 days or longer), proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order of two weeks), techniques such as surface roughening may be appropriate. For longer periods of inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding should be used on finished areas that have not been otherwise stabilized. Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional requirements for seeding and temporary stabilization. Design and Installation Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric until plants are established. The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding and mulching recommendations that may be referenced to supplement this Fact Sheet. Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching. Seedbed Preparation Prior to seeding, ensure that areas to be revegetated have soil conditions capable of supporting vegetation. Overlot grading can result in loss of topsoil, resulting in poor quality subsoils at the ground surface that have low nutrient value, little organic matter content, few soil microorganisms, rooting restrictions, and conditions less conducive to infiltration of precipitation. As a result, it is typically necessary to provide stockpiled topsoil, compost, or other Temporary and Permanent Seeding Functions Erosion Control Yes Sediment Control No Site/Material Management No EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 soil amendments and rototill them into the soil to a depth of 6 inches or more. Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later. Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content. The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across areas that will be revegetated. Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth medium. Organic matter, such as well digested compost, can be added to improve soil characteristics conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil testing, which is typically inexpensive, should be completed to determine and optimize the types and amounts of amendments that are required. If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth. Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth and conducive to plant growth. Seed-to-soil contact is the key to good germination. Seed Mix for Temporary Vegetation To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully landscaped or worked for an extended period (typically 30 days or more), plant an annual grass appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver metropolitan area are listed in Table TS/PS-1. These are to be considered only as general recommendations when specific design guidance for a particular site is not available. Local governments typically specify seed mixes appropriate for their jurisdiction. Seed Mix for Permanent Revegetation To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should be established. Permanent seeding should be performed promptly (typically within 14 days) after reaching final grade. Each site will have different characteristics and a landscape professional or the local jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding equipment. If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones, planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii), plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen for perennial grasses. Temporary and Permanent Seeding (TS/PS) EC-2 November 2010 Urban Drainage and Flood Control District TS/PS-3 Urban Storm Drainage Criteria Manual Volume 3 Seeding dates for the highest success probability of perennial species along the Front Range are generally in the spring from April through early May and in the fall after the first of September until the ground freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for appropriate seeding dates. Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses Speciesa (Common name) Growth Seasonb Pounds of Pure Live Seed (PLS)/acrec Planting Depth (inches) 1. Oats Cool 35 - 50 1 - 2 2. Spring wheat Cool 25 - 35 1 - 2 3. Spring barley Cool 25 - 35 1 - 2 4. Annual ryegrass Cool 10 - 15 ½ 5. Millet Warm 3 - 15 ½ - ¾ 6. Sudangrass Warm 5–10 ½ - ¾ 7. Sorghum Warm 5–10 ½ - ¾ 8. Winter wheat Cool 20–35 1 - 2 9. Winter barley Cool 20–35 1 - 2 10. Winter rye Cool 20–35 1 - 2 11. Triticale Cool 25–40 1 - 2 a Successful seeding of annual grass resulting in adequate plant growth will usually produce enough dead-plant residue to provide protection from wind and water erosion for an additional year. This assumes that the cover is not disturbed or mowed closer than 8 inches. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1 or where access limitations exist. When hydraulic seeding is used, hydraulic mulching should be applied as a separate operation, when practical, to prevent the seeds from being encapsulated in the mulch. b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied, may extend the use of cool season species during the summer months. c Seeding rates should be doubled if seed is broadcast, or increased by 50 percent if done using a Brillion Drill or by hydraulic seeding. EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses Common a Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre Alakali Soil Seed Mix Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25 Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5 Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5 Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 17.75 Fertile Loamy Soil Seed Mix Ephriam crested wheatgrass Agropyron cristatum 'Ephriam' Cool Sod 175,000 2.0 Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0 Total 15.5 High Water Table Soil Seed Mix Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5 Redtop Agrostis alba Warm Open sod 5,000,000 0.25 Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Pathfinder switchgrass Panicum virgatum 'Pathfinder' Warm Sod 389,000 1.0 Alkar tall wheatgrass Agropyron elongatum 'Alkar' Cool Bunch 79,000 5.5 Total 10.75 Transition Turf Seed Mixc Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5 Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0 Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Total 7.5 Temporary and Permanent Seeding (TS/PS) EC-2 November 2010 Urban Drainage and Flood Control District TS/PS-5 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.) Common Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre Sandy Soil Seed Mix Blue grama Bouteloua gracilis Warm Sod-forming bunchgrass 825,000 0.5 Camper little bluestem Schizachyrium scoparium 'Camper' Warm Bunch 240,000 1.0 Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0 Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25 Vaughn sideoats grama Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 10.25 Heavy Clay, Rocky Foothill Seed Mix Ephriam crested wheatgrass d Agropyron cristatum 'Ephriam' Cool Sod 175,000 1.5 Oahe Intermediate wheatgrass Agropyron intermedium 'Oahe' Cool Sod 115,000 5.5 Vaughn sideoats grama e Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 17.5 a All of the above seeding mixes and rates are based on drill seeding followed by crimped hay or straw mulch. These rates should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1. If hydraulic seeding is used, hydraulic mulching should be done as a separate operation. b See Table TS/PS-3 for seeding dates. c If site is to be irrigated, the transition turf seed rates should be doubled. d Crested wheatgrass should not be used on slopes steeper than 6H to 1V. e Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama. EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses Annual Grasses (Numbers in table reference species in Table TS/PS-1) Perennial Grasses Seeding Dates Warm Cool Warm Cool January 1–March 15   March 16–April 30 4 1,2,3   May 1–May 15 4  May 16–June 30 4,5,6,7 July 1–July 15 5,6,7 July 16–August 31 September 1–September 30 8,9,10,11 October 1–December 31   Mulch Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP Fact Sheet for additional guidance. Maintenance and Removal Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed and mulch these areas, as needed. An area that has been permanently seeded should have a good stand of vegetation within one growing season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of the site that fail to germinate or remain bare after the first growing season. Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may also be necessary. Protect seeded areas from construction equipment and vehicle access. Mulching (MU) EC-4 November 2010 Urban Drainage and Flood Control District MU-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph MU-1. An area that was recently seeded, mulched, and crimped. Description Mulching consists of evenly applying straw, hay, shredded wood mulch, bark or compost to disturbed soils and securing the mulch by crimping, tackifiers, netting or other measures. Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration, and reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it can also be used for temporary stabilization of areas that cannot be reseeded due to seasonal constraints. Mulch can be applied either using standard mechanical dry application methods or using hydromulching equipment that hydraulically applies a slurry of water, wood fiber mulch, and often a tackifier. Appropriate Uses Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer than 14 days) on portions of the site not otherwise permanently stabilized. Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed in certain jurisdictions or may not be allowed near waterways. Do not apply mulch during windy conditions. Design and Installation Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track walking. Track walking should only be used where other methods are impractical because track walking with heavy equipment typically compacts the soil. A variety of mulches can be used effectively at construction sites, including the following types: Mulch Functions Erosion Control Yes Sediment Control Moderate Site/Material Management No EC-4 Mulching (MU) MU-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3  Clean, weed- and seed-free, long-stemmed grass hay (preferred) or cereal grain straw. Hay is preferred because it is less susceptible to removal by wind. Mulch should be applied evenly at a rate of 2 tons per acre and must be tacked or fastened by an approved method suitable for the type of mulch used. At least 50 percent of the grass hay mulch, by weight, should be 10 inches or more in length.  Grass hay mulch must be anchored and not merely placed on the surface. This can be accomplished mechanically by crimping or with the aid of tackifiers or nets. Anchoring with a crimping implement is preferred, and is the recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long mulch fibers into the soil to a depth of 3 inches without cutting them. An agricultural disk, while not an ideal substitute, may work if the disk blades are dull or blunted and set vertically; however, the frame may have to be weighted to afford proper soil penetration.  On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory for holding it in place. For steep slopes and special situations where greater control is needed, erosion control blankets anchored with stakes should be used instead of mulch.  Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation should be avoided.  Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass or straw mulch. Normally, use of these products will be restricted to relatively small areas. Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead of mulch. (See the ECM/TRM BMP for more information.)  Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP for more information on general types of tackifiers.)  Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full coverage of exposed soil on the area it is applied. Maintenance and Removal After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as needed, to cover bare areas. Wind Erosion/Dust Control (DC) EC-14 November 2010 Urban Drainage and Flood Control District DC-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph DC-1. Water truck used for dust suppression. Photo courtesy of Douglas County. Description Wind erosion and dust control BMPs help to keep soil particles from entering the air as a result of land disturbing construction activities. These BMPs include a variety of practices generally focused on either graded disturbed areas or construction roadways. For graded areas, practices such as seeding and mulching, use of soil binders, site watering, or other practices that provide prompt surface cover should be used. For construction roadways, road watering and stabilized surfaces should be considered. Appropriate Uses Dust control measures should be used on any site where dust poses a problem to air quality. Dust control is important to control for the health of construction workers and surrounding waterbodies. Design and Installation The following construction BMPs can be used for dust control:  An irrigation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil particles from becoming airborne.  Seeding and mulching can be used to stabilize disturbed surfaces and reduce dust emissions.  Protecting existing vegetation can help to slow wind velocities across the ground surface, thereby limiting the likelihood of soil particles to become airborne.  Spray-on soil binders form a bond between soil particles keeping them grounded. Chemical treatments may require additional permitting requirements. Potential impacts to surrounding waterways and habitat must be considered prior to use.  Placing rock on construction roadways and entrances will help keep dust to a minimum across the construction site.  Wind fences can be installed on site to reduce wind speeds. Install fences perpendicular to the prevailing wind direction for maximum effectiveness. Maintenance and Removal When using an irrigation/sprinkler control system to aid in dust control, be careful not to overwater. Overwatering will cause construction vehicles to track mud off-site. Wind Erosion Control/ Dust Control Functions Erosion Control Yes Sediment Control No Site/Material Management Moderate Concrete Washout Area (CWA) MM-1 November 2010 Urban Drainage and Flood Control District CWA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CWA-1. Example of concrete washout area. Note gravel tracking pad for access and sign. Description Concrete waste management involves designating and properly managing a specific area of the construction site as a concrete washout area. A concrete washout area can be created using one of several approaches designed to receive wash water from washing of tools and concrete mixer chutes, liquid concrete waste from dump trucks, mobile batch mixers, or pump trucks. Three basic approaches are available: excavation of a pit in the ground, use of an above ground storage area, or use of prefabricated haul- away concrete washout containers. Surface discharges of concrete washout water from construction sites are prohibited. Appropriate Uses Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid concrete waste from onsite concrete mixing or concrete delivery. Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete washout, the soil must have adequate buffering capacity to result in protection of state groundwater standards; otherwise, a liner/containment must be used. The following management practices are recommended to prevent an impact from unlined pits to groundwater:  The use of the washout site should be temporary (less than 1 year), and  The washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands. Design and Installation Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the ground, commercially manufactured prefabricated washout containers, or aboveground holding areas constructed of berms, sandbags or straw bales with a plastic liner. Although unlined washout areas may be used, lined pits may be required to protect groundwater under certain conditions. Do not locate an unlined washout area within 400 feet of any natural drainage pathway or waterbody or within 1,000 feet of any wells or drinking water sources. Even for lined concrete washouts, it is advisable to locate the facility away from waterbodies and drainage paths. If site constraints make these Concrete Washout Area Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-1 Concrete Washout Area (CWA) CWA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated concrete washout devices or a lined aboveground storage area should be used. Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage areas. Pre-fabricated concrete washout container information can be obtained from vendors. Maintenance and Removal A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that adequate signage is provided and in good repair and that the washout area is being used, as opposed to washout in non-designated areas of the site. Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal location. Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash water is allowed to evaporate and the concrete hardens, it may be recycled. Photograph CWA-3. Earthen concrete washout. Photo courtesy of CDOT. Photograph CWA-2. Prefabricated concrete washout. Photo courtesy of CDOT. Concrete Washout Area (CWA) MM-1 November 2010 Urban Drainage and Flood Control District CWA-3 Urban Storm Drainage Criteria Manual Volume 3 MM-1 Concrete Washout Area (CWA) CWA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SP-1. A topsoil stockpile that has been partially revegetated and is protected by silt fence perimeter control. Description Stockpile management includes measures to minimize erosion and sediment transport from soil stockpiles. Appropriate Uses Stockpile management should be used when soils or other erodible materials are stored at the construction site. Special attention should be given to stockpiles in close proximity to natural or manmade storm systems. Design and Installation Locate stockpiles away from all drainage system components including storm sewer inlets. Where practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a stabilized designated access point on the upgradient side of the stockpile. Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14 days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are "typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that may be more prescriptive. Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be protected. Maintenance and Removal Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets. Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be necessary. When temporary removal of a perimeter BMP is necessary to access a stockpile, ensure BMPs are reinstalled in accordance with their respective design detail section. Stockpile Management Functions Erosion Control Yes Sediment Control Yes Site/Material Management Yes MM-2 Stockpile Management (SM) SP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise stabilize the ground surface where the stockpile was located. Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-3 Urban Storm Drainage Criteria Manual Volume 3 MM-2 Stockpile Management (SM) SP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-5 Urban Storm Drainage Criteria Manual Volume 3 MM-2 Stockpile Management (SM) SP-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-1 Urban Storm Drainage Criteria Manual Volume 3 Photographs GH-1 and GH-2. Proper materials storage and secondary containment for fuel tanks are important good housekeeping practices. Photos courtesy of CDOT and City of Aurora. Description Implement construction site good housekeeping practices to prevent pollution associated with solid, liquid and hazardous construction-related materials and wastes. Stormwater Management Plans (SWMPs) should clearly specify BMPs including these good housekeeping practices:  Provide for waste management.  Establish proper building material staging areas.  Designate paint and concrete washout areas.  Establish proper equipment/vehicle fueling and maintenance practices.  Control equipment/vehicle washing and allowable non- stormwater discharges.  Develop a spill prevention and response plan. Acknowledgement: This Fact Sheet is based directly on EPA guidance provided in Developing Your Stormwater Pollution Prevent Plan (EPA 2007). Appropriate Uses Good housekeeping practices are necessary at all construction sites. Design and Installation The following principles and actions should be addressed in SWMPs:  Provide for Waste Management. Implement management procedures and practices to prevent or reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes that will be generated at the site. Practices such as trash disposal, recycling, proper material handling, and cleanup measures can reduce the potential for stormwater runoff to pick up construction site wastes and discharge them to surface waters. Implement a comprehensive set of waste-management practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides, wood preservatives, acids, roofing tar, and other materials. Practices should include storage, handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be considered include: Solid or Construction Waste o Designate trash and bulk waste-collection areas on- site. Good Housekeeping Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-3 Good Housekeeping Practices (GH) GH-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph GH-3. Locate portable toilet facilities on level surfaces away from waterways and storm drains. Photo courtesy of WWE. o Recycle materials whenever possible (e.g., paper, wood, concrete, oil). o Segregate and provide proper disposal options for hazardous material wastes. o Clean up litter and debris from the construction site daily. o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste- collection areas (dumpsters, and such) are often best located near construction site entrances to minimize traffic on disturbed soils. Consider secondary containment around waste collection areas to minimize the likelihood of contaminated discharges. o Empty waste containers before they are full and overflowing. Sanitary and Septic Waste o Provide convenient, well-maintained, and properly located toilet facilities on-site. o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills and contamination of stormwater. o Maintain clean restroom facilities and empty portable toilets regularly. o Where possible, provide secondary containment pans under portable toilets. o Provide tie-downs or stake-downs for portable toilets. o Educate employees, subcontractors, and suppliers on locations of facilities. o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not discharge or bury wastewater at the construction site. o Inspect facilities for leaks. If found, repair or replace immediately. o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are not spilled on the ground. Hazardous Materials and Wastes o Develop and implement employee and subcontractor education, as needed, on hazardous and toxic waste handling, storage, disposal, and cleanup. o Designate hazardous waste-collection areas on-site. o Place all hazardous and toxic material wastes in secondary containment. Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-3 Urban Storm Drainage Criteria Manual Volume 3 o Hazardous waste containers should be inspected to ensure that all containers are labeled properly and that no leaks are present.  Establish Proper Building Material Handling and Staging Areas. The SWMP should include comprehensive handling and management procedures for building materials, especially those that are hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building materials that have the potential to contaminate stormwater should be stored indoors or under cover whenever possible or in areas with secondary containment. Secondary containment measures prevent a spill from spreading across the site and may include dikes, berms, curbing, or other containment methods. Secondary containment techniques should also ensure the protection of groundwater. Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and other potential pollutants. Designated staging areas enable easier monitoring of the use of materials and clean up of spills. Training employees and subcontractors is essential to the success of this pollution prevention principle. Consider the following specific materials handling and staging practices: o Train employees and subcontractors in proper handling and storage practices. o Clearly designate site areas for staging and storage with signs and on construction drawings. Staging areas should be located in areas central to the construction site. Segment the staging area into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle tracking controls (See Vehicle Tracking Control Fact Sheet). o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC) requirements and plans and provide cover and impermeable perimeter control, as necessary, for hazardous materials and contaminated soils that must be stored on site. o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation failure, or other signs of deterioration and tested for soundness. o Reuse and recycle construction materials when possible.  Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout facilities at their own plants or dispatch facilities when feasible; however, concrete washout commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on- site, designate specific washout areas and design facilities to handle anticipated washout water. Washout areas should also be provided for paint and stucco operations. Because washout areas can be a source of pollutants from leaks or spills, care must be taken with regard to their placement and proper use. See the Concrete Washout Area Fact Sheet for detailed guidance. Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint, and stucco work are occurring on large portions of the site. Be sure to check for evidence that contractors are using the washout areas and not dumping materials onto the ground or into drainage facilities. If the washout areas are not being used regularly, consider posting additional signage, relocating the facilities to more convenient locations, or providing training to workers and contractors. When concrete, paint, or stucco is part of the construction process, consider these practices which will help prevent contamination of stormwater. Include the locations of these areas and the maintenance and inspection procedures in the SWMP. MM-3 Good Housekeeping Practices (GH) GH-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained areas, or streams. Only use designated washout areas. o Establish washout areas and advertise their locations with signs. Ensure that signage remains in good repair. o Provide adequate containment for the amount of wash water that will be used. o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be removed. o Dispose of materials properly. The preferred method is to allow the water to evaporate and to recycle the hardened concrete. Full service companies may provide dewatering services and should dispose of wastewater properly. Concrete wash water can be highly polluted. It should not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer system without first receiving written permission from the system operator.  Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and maintenance activities in a covered area. Consider the following practices to help prevent the discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the locations of designated fueling and maintenance areas and inspection and maintenance procedures in the SWMP. o Train employees and subcontractors in proper fueling procedures (stay with vehicles during fueling, proper use of pumps, emergency shutoff valves, etc.). o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service problems. o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses to prevent stormwater run-on and runoff. o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids. o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and recycle fluids whenever possible.  Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement practices to prevent contamination of surface and groundwater from equipment and vehicle wash water. Representative practices include: o Educate employees and subcontractors on proper washing procedures. o Use off-site washing facilities, when available. o Clearly mark the washing areas and inform workers that all washing must occur in this area. o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain separation from drainage paths and waterbodies. Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-5 Urban Storm Drainage Criteria Manual Volume 3 o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can remove most dirt adequately. o Do not conduct other activities, such as vehicle repairs, in the wash area. o Include the location of the washing facilities and the inspection and maintenance procedures in the SWMP.  Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be identified in the SWMP. Representative procedures include identifying ways to reduce the chance of spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by spills, and train personnel responsible for spill prevention and response. The plan should also specify material handling procedures and storage requirements and ensure that clear and concise spill cleanup procedures are provided and posted for areas in which spills may potentially occur. When developing a spill prevention plan, include the following: o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface waterbodies on or near the site, and measures to stop spills from leaving the site. o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data Sheets (MSDSs) for chemical used on site with the SWMP. o Establish an education program for employees and subcontractors on the potential hazards to humans and the environment from spills and leaks. o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or municipal sewage treatment facilities to request assistance. Emergency procedures and contact numbers should be provided in the SWMP and posted at storage locations. o Describe the procedures, equipment and materials for immediate cleanup of spills and proper disposal. o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill prevention plan and clean up materials as changes occur to the types of chemicals stored and used at the facility. MM-3 Good Housekeeping Practices (GH) GH-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Spill Prevention, Control, and Countermeasure (SPCC) Plan Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks. The facility is subject to this rule if it is a non-transportation-related facility that:  Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity greater than 42,000 gallons.  Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters of the United States and adjoining shorelines. Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan. To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm. Reporting Oil Spills In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for assistance, or for more details, visit their website: www.nrc.uscg.mil. Maintenance and Removal Effective implementation of good housekeeping practices is dependent on clear designation of personnel responsible for supervising and implementing good housekeeping programs, such as site cleanup and disposal of trash and debris, hazardous material management and disposal, vehicle and equipment maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness. Checklists may be helpful in good housekeeping efforts. Staging and storage areas require permanent stabilization when the areas are no longer being used for construction-related activities. Construction-related materials, debris and waste must be removed from the construction site once construction is complete. Design Details See the following Fact Sheets for related Design Details: MM-1 Concrete Washout Area MM-2 Stockpile Management SM-4 Vehicle Tracking Control Design details are not necessary for other good housekeeping practices; however, be sure to designate where specific practices will occur on the appropriate construction drawings. Silt Fence (SF) SC-1 November 2010 Urban Drainage and Flood Control District SF-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SF-1. Silt fence creates a sediment barrier, forcing sheet flow runoff to evaporate or infiltrate. Description A silt fence is a woven geotextile fabric attached to wooden posts and trenched into the ground. It is designed as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses A silt fence can be used where runoff is conveyed from a disturbed area as sheet flow. Silt fence is not designed to receive concentrated flow or to be used as a filter fabric. Typical uses include:  Down slope of a disturbed area to accept sheet flow.  Along the perimeter of a receiving water such as a stream, pond or wetland.  At the perimeter of a construction site. Design and Installation Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the silt fence. See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled out by hand and there should be no gaps between the ground and the fabric. Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and other specifications in the design details. Improper installation of silt fence is a common reason for silt fence failure; however, when properly installed and used for the appropriate purposes, it can be highly effective. Silt Fence Functions Erosion Control No Sediment Control Yes Site/Material Management No SC-1 Silt Fence (SF) SF-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph SF-2. When silt fence is not installed along the contour, a "J-hook" installation may be appropriate to ensure that the BMP does not create concentrated flow parallel to the silt fence. Photo courtesy of Tom Gore. Maintenance and Removal Inspection of silt fence includes observing the material for tears or holes and checking for slumping fence and undercut areas bypassing flows. Repair of silt fence typically involves replacing the damaged section with a new section. Sediment accumulated behind silt fence should be removed, as needed to maintain BMP effectiveness, typically before it reaches a depth of 6 inches. Silt fence may be removed when the upstream area has reached final stabilization. Silt Fence (SF) SC-1 November 2010 Urban Drainage and Flood Control District SF-3 Urban Storm Drainage Criteria Manual Volume 3 SC-1 Silt Fence (SF) SF-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Sediment Control Log (SCL) SC-2 November 2010 Urban Drainage and Flood Control District SCL-1 Urban Storm Drainage Criteria Manual Volume 3 Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a perimeter control around a soil stockpile; and, 2) as a "J-hook" perimeter control at the corner of a construction site. Description A sediment control log is a linear roll made of natural materials such as straw, coconut fiber, or other fibrous material trenched into the ground and held with a wooden stake. Sediment control logs are also often referred to as "straw wattles." They are used as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses Sediment control logs can be used in the following applications to trap sediment:  As perimeter control for stockpiles and the site.  As part of inlet protection designs.  As check dams in small drainage ditches. (Sediment control logs are not intended for use in channels with high flow velocities.)  On disturbed slopes to shorten flow lengths (as an erosion control).  As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland. Sediment control logs work well in combination with other layers of erosion and sediment controls. Design and Installation Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to sediment control logs installed along the contour. When installed for other uses, such as perimeter control, it should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the BMP. Sediment Control Log Functions Erosion Control Moderate Sediment Control Yes Site/Material Management No SC-2 Sediment Control Log (SCL) SCL-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become a barrier and should be installed is if they are impermeable. Design details and notes for sediment control logs are provided in Detail SCL-1. Sediment logs must be properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to flow). Improper installation can lead to poor performance. Be sure that sediment control logs are properly trenched, anchored and tightly jointed. Maintenance and Removal Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the depth is one-half the height of the sediment log and repair damage to the sediment log, typically by replacing the damaged section. Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as permanent slope breaks). However, removal of sediment control logs after final stabilization is typically recommended when used in perimeter control, inlet protection and check dam applications. Sediment Control Log (SCL) SC-2 November 2010 Urban Drainage and Flood Control District SCL-3 Urban Storm Drainage Criteria Manual Volume 3 SC-2 Sediment Control Log (SCL) SCL-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Sediment Control Log (SCL) SC-2 November 2010 Urban Drainage and Flood Control District SCL-5 Urban Storm Drainage Criteria Manual Volume 3 Rock Sock (RS) SC-5 November 2010 Urban Drainage and Flood Control District RS-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph RS-1. Rock socks placed at regular intervals in a curb line can help reduce sediment loading to storm sewer inlets. Rock socks can also be used as perimeter controls. Description A rock sock is constructed of gravel that has been wrapped by wire mesh or a geotextile to form an elongated cylindrical filter. Rock socks are typically used either as a perimeter control or as part of inlet protection. When placed at angles in the curb line, rock socks are typically referred to as curb socks. Rock socks are intended to trap sediment from stormwater runoff that flows onto roadways as a result of construction activities. Appropriate Uses Rock socks can be used at the perimeter of a disturbed area to control localized sediment loading. A benefit of rock socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the ground; therefore, they are often used on roadway construction projects where paved surfaces are present. Use rock socks in inlet protection applications when the construction of a roadway is substantially complete and the roadway has been directly connected to a receiving storm system. Design and Installation When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per 100 lineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are used for inlet protection and in the curb line. When placed in the gutter adjacent to a curb, rock socks should protrude no more than two feet from the curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert drivers and street maintenance workers of their presence. Maintenance and Removal Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to maintain the functionality of the BMP, typically when sediment has accumulated behind the rock sock to one-half of the sock's height. Once upstream stabilization is complete, rock socks and accumulated sediment should be removed and properly disposed. Rock Sock Functions Erosion Control No Sediment Control Yes Site/Material Management No SC-5 Rock Sock (RS) RS-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Rock Sock (RS) SC-5 November 2010 Urban Drainage and Flood Control District RS-3 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph IP-1. Inlet protection for a curb opening inlet. Description Inlet protection consists of permeable barriers installed around an inlet to filter runoff and remove sediment prior to entering a storm drain inlet. Inlet protection can be constructed from rock socks, sediment control logs, silt fence, block and rock socks, or other materials approved by the local jurisdiction. Area inlets can also be protected by over-excavating around the inlet to form a sediment trap. Appropriate Uses Install protection at storm sewer inlets that are operable during construction. Consider the potential for tracked-out sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets must be protected. This may include inlets in the general proximity of the construction area, not limited to downgradient inlets. Inlet protection is not Design and Installation a stand-alone BMP and should be used in conjunction with other upgradient BMPs. To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet to function without completely blocking flows into the inlet in a manner that causes localized flooding. When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a curb and gutter setting, but are effective area inlet protection measures. Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary products are available for inlet protection that may be approved for use by local governments. If proprietary products are used, design details and installation procedures from the manufacturer must be followed. Regardless of the type of inlet protection selected, inlet protection is most effective when combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier before runoff enters the storm sewer or receiving water. Design details with notes are provided for these forms of inlet protection: IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade Inlets IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade Inlets Inlet Protection (various forms) Functions Erosion Control No Sediment Control Yes Site/Material Management No SC-6 Inlet Protection (IP) IP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 IP-3. Rock Sock Inlet Protection for Sump/Area Inlet IP-4. Silt Fence Inlet Protection for Sump/Area Inlet IP-5. Over-excavation Inlet Protection IP-6. Straw Bale Inlet Protection for Sump/Area Inlet CIP-1. Culvert Inlet Protection Propriety inlet protection devices should be installed in accordance with manufacturer specifications. More information is provided below on selecting inlet protection for sump and on-grade locations. Inlets Located in a Sump When applying inlet protection in sump conditions, it is important that the inlet continue to function during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower than the top of the curb opening to allow overflow into the inlet during larger storms without excessive localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing localized flooding, public safety issues, and downstream erosion and damage from bypassed flows. Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary products providing equivalent functions. Inlets Located on a Slope For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads, also see the Check Dam Fact Sheet. Maintenance and Removal Inspect inlet protection frequently. Inspection and maintenance guidance includes:  Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents of the BMP (e.g., gravel) washing into the inlet.  Check for improper installation resulting in untreated flows bypassing the BMP and directly entering the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been properly trenched around the inlet can result in flows under the silt fence and directly into the inlet.  Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also crush or displace the BMP.  Monitor sediment accumulation upgradient of the inlet protection. Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-3 Urban Storm Drainage Criteria Manual Volume 3  Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches. Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain the functionality of the BMP.  Propriety inlet protection devices should be inspected and maintained in accordance with manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed in a timely manner to prevent devices from breaking and spilling sediment into the storm drain. Inlet protection must be removed and properly disposed of when the drainage area for the inlet has reached final stabilization. SC-6 Inlet Protection (IP) IP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-5 Urban Storm Drainage Criteria Manual Volume 3 SC-6 Inlet Protection (IP) IP-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-7 Urban Storm Drainage Criteria Manual Volume 3 Vegetated Buffers (VB) SC-9 November 2010 Urban Drainage and Flood Control District VB-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph VB-1. A vegetated buffer is maintained between the area of active construction and the drainage swale. Photo courtesy of WWE. Description Buffer strips of preserved natural vegetation or grass help protect waterways and wetlands from land disturbing activities. Vegetated buffers improve stormwater runoff quality by straining sediment, promoting infiltration, and slowing runoff velocities. Appropriate Uses Vegetated buffers can be used to separate land disturbing activities and natural surface waters or conveyances. In many jurisdictions, local governments require some type of setback from natural waterways. Concentrated flow should not be directed through a buffer; instead, runoff should be in the form of sheet flow. Vegetated buffers are typically used in combination with other perimeter control BMPs such as sediment control logs or silt fence for multi- layered protection. Design and Installation Minimum buffer widths may vary based on local regulations. Clearly delineate the boundary of the natural buffer area using construction fencing, silt fence, or a comparable technique. In areas that have been cleared and graded, vegetated buffers such as sod can also be installed to create or restore a vegetated buffer around the perimeter of the site. Maintenance and Removal Inspect buffer areas for signs of erosion such as gullies or rills. Stabilize eroding areas, as needed. If erosion is due to concentrated flow conditions, it may be necessary to install a level spreader or other technique to restore sheet flow conditions. Inspect perimeter controls delineating the vegetative buffer and repair or replace as needed. Vegetated Buffers Functions Erosion Control Moderate Sediment Control Yes Site/Material Management Yes Protection of Existing Vegetation (PV) SM-2 November 2010 Urban Drainage and Flood Control District PV-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph PV-1. Protection of existing vegetation and a sensitive area. Photo courtesy of CDOT. Description Protection of existing vegetation on a construction site can be accomplished through installation of a construction fence around the area requiring protection. In cases where upgradient areas are disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas such as wetlands. Existing vegetation may be designated for protection to maintain a stable surface cover as part of construction phasing, or vegetation may be protected in areas designated to remain in natural condition under post-development conditions (e.g., wetlands, mature trees, riparian areas, open space). Appropriate Uses Existing vegetation should be preserved for the maximum practical duration on a construction site through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and can reduce revegetation costs following construction. Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas. If trees are to be protected as part of post-development landscaping, care must be taken to avoid several types of damage, some of which may not be apparent at the time of injury. Potential sources of injury include soil compaction during grading or due to construction traffic, direct equipment-related injury such as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be developed during site design, implemented at the beginning of a construction project, as well as continued during active construction. Design and Installation General Once an area has been designated as a preservation area, there should be no construction activity allowed within a set distance of the area. Clearly mark the area with construction fencing. Do not allow stockpiles, equipment, trailers or parking within the protected area. Guidelines to protect various types of existing vegetation follow. Protection of Existing Vegetation Functions Erosion Control Yes Sediment Control Moderate Site/Material Management Yes SM-2 Protection of Existing Vegetation (PV) PV-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Surface Cover During Phased Construction Install construction fencing or other perimeter controls around areas to be protected from clearing and grading as part of construction phasing. Maintaining surface cover on steep slopes for the maximum practical duration during construction is recommended. Open Space Preservation Where natural open space areas will be preserved as part of a development, it is important to install construction fencing around these areas to protect them from compaction. This is particularly important when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open space areas should not be used for staging and equipment storage. Wetlands and Riparian Areas Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland. Tree Protection 1  Before beginning construction operations, establish a tree protection zone around trees to be preserved by installing construction fences. Allow enough space from the trunk to protect the root zone from soil compaction and mechanical damage, and the branches from mechanical damage (see Table PV-1). If low branches will be kept, place the fence outside of the drip line. Where this is not possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be aware that about 60 percent of the tree's root zone extends beyond the drip line. Table PV-1 Guidelines for Determining the Tree Protection Zone (Source: Matheny and Clark, 1998; as cited in GreenCO and WWE 2008) Distance from Trunk (ft) per inch of DBH Species Tolerance to Damage Young Mature Over mature Good 0.5' 0.75' 1.0' Moderate 0.75' 1.0' 1.25' Poor 1.0' 1.25' 1.5' Notes: DBH = diameter at breast height (4.5 ft above grade); Young = <20% of life expectancy; Mature = 20%-80% of life expectancy; Over mature =>80% of life expectancy  Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection zone should be avoided where possible because seemingly minor grade changes can either smother 1 Tree Protection guidelines adapted from GreenCO and WWE (2008). Green Industry Best Management Practices (BMPs) for the Conservation and Protection of Water Resources in Colorado: Moving Toward Sustainability, Third Release. See www.greenco.org for more detailed guidance on tree preservation. Protection of Existing Vegetation (PV) SM-2 November 2010 Urban Drainage and Flood Control District PV-3 Urban Storm Drainage Criteria Manual Volume 3 roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to avoid grade changes in the tree protection zone.  Place and maintain a layer of mulch 4 to 6-inch thick from the tree trunk to the fencing, keeping a 6-inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil compaction if construction traffic is unavoidable. When planting operations are completed, the mulch may be reused throughout planting areas.  Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals to be dumped, or construction activities to take place except fine grading, irrigation system installation, and planting operations. These activities should be conducted in consultation with a landscaping professional, following Green Industry BMPs.  Be aware that soil compaction can cause extreme damage to tree health that may appear gradually over a period of years. Soil compaction is easier to prevent than repair. Maintenance and Removal Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area. If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a designated preservation area is damaged beyond repair, remove and replace with a 2-inch diameter tree of the same or similar species. Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require notification of the USACE. If damage to vegetation occurs in a protected area, reseed the area with the same or similar species, following the recommendations in the USDCM Revegetation chapter. Construction Fence (CF) SM-3 November 2010 Urban Drainage and Flood Control District CF-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CF-1. A construction fence helps delineate areas where existing vegetation is being protected. Photo courtesy of Douglas County. Description A construction fence restricts site access to designated entrances and exits, delineates construction site boundaries, and keeps construction out of sensitive areas such as natural areas to be preserved as open space, wetlands and riparian areas. Appropriate Uses A construction fence can be used to delineate the site perimeter and locations within the site where access is restricted to protect natural resources such as wetlands, waterbodies, trees, and other natural areas of the site that should not be disturbed. If natural resource protection is an objective, then the construction fencing should be used in combination with other perimeter control BMPs such as silt fence, sediment control logs or similar measures. Design and Installation Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s recommendations. See Detail CF-1 for typical installations. Do not place construction fencing in areas within work limits of machinery. Maintenance and Removal  Inspect fences for damage; repair or replace as necessary.  Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.  Fencing should be removed once construction is complete. Construction Fence Functions Erosion Control No Sediment Control No Site/Material Management Yes SM-3 Construction Fence (CF) CF-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM-3 November 2010 Urban Drainage and Flood Control District CF-3 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking. Description Vehicle tracking controls provide stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto the paved surface. Appropriate Uses Implement a stabilized construction entrance or vehicle tracking control where frequent heavy vehicle traffic exits the construction site onto a paved roadway. An effective vehicle tracking control is particularly important during the following conditions:  Wet weather periods when mud is easily tracked off site.  During dry weather periods where dust is a concern.  When poorly drained, clayey soils are present on site. Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at particularly muddy sites. Design and Installation Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including: VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires. VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance. Vehicle Tracking Control Functions Erosion Control Moderate Sediment Control Yes Site/Material Management Yes SM-4 Vehicle Tracking Control (VTC) VTC-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-2. A vehicle tracking control pad with wheel wash facility. Photo courtesy of Tom Gore. VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as hand-held power washing equipment to more advance proprietary systems. When a wheel wash is provided, it is important to direct wash water to a sediment trap prior to discharge from the site. Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff. Maintenance and Removal Inspect the area for degradation and replace aggregate or material used for a stabilized entrance/exit as needed. If the area becomes clogged and ponds water, remove and dispose of excess sediment or replace material with a fresh layer of aggregate as necessary. With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way. Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment in the roadway indicates that the stabilized construction entrance needs maintenance. Ensure that drainage ditches at the entrance/exit area remain clear. A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to occur. This is typically after the site has been stabilized. When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to discharge. Also inspect channels conveying the water from the wash area to the sediment trap and stabilize areas that may be eroding. When a construction entrance/exit is removed, excess sediment from the aggregate should be removed and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface following removal, typically by paving. Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-3 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-5 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stabilized Staging Area (SSA) SM-6 November 2010 Urban Drainage and Flood Control District SSA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SSA-1. Example of a staging area with a gravel surface to prevent mud tracking and reduce runoff. Photo courtesy of Douglas County. Description A stabilized staging area is a clearly designated area where construction equipment and vehicles, stockpiles, waste bins, and other construction-related materials are stored. The contractor office trailer may also be located in this area. Depending on the size of the construction site, more than one staging area may be necessary. Appropriate Uses Most construction sites will require a staging area, which should be clearly designated in SWMP drawings. The layout of the staging area may vary depending on the type of construction activity. Staging areas located in roadways due to space constraints require special measures to avoid materials being washed into storm inlets. Design and Installation Stabilized staging areas should be completed prior to other construction activities beginning on the site. Major components of a stabilized staging area include:  Appropriate space to contain storage and provide for loading/unloading operations, as well as parking if necessary.  A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.  Perimeter controls such as silt fence, sediment control logs, or other measures.  Construction fencing to prevent unauthorized access to construction materials.  Provisions for Good Housekeeping practices related to materials storage and disposal, as described in the Good Housekeeping BMP Fact Sheet.  A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet, to accommodate traffic associated with material delivery and waste disposal vehicles. Over-sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that required for the project. This increases costs, as well as requirements for long-term stabilization following the construction period. When designing the stabilized staging area, minimize the area of disturbance to the extent practical. Stabilized Staging Area Functions Erosion Control Yes Sediment Control Moderate Site/Material Yes SM-6 Stabilized Staging Area (SSA) SSA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when materials staging in roadways is required. Maintenance and Removal Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing perimeter controls, and following good housekeeping practices. When construction is complete, debris, unused stockpiles and materials should be recycled or properly disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface cover planned for the development. Minimizing Long-Term Stabilization Requirements  Utilize off-site parking and restrict vehicle access to the site.  Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed otherwise.  Consider use of a bermed contained area for materials and equipment that do not require a stabilized surface.  Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise disturbed. Stabilized Staging Area (SSA) SM-6 November 2010 Urban Drainage and Flood Control District SSA-3 Urban Storm Drainage Criteria Manual Volume 3 SM-6 Stabilized Staging Area (SSA) SSA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Street Sweeping and Vacuuming (SS) SM-7 November 2010 Urban Drainage and Flood Control District SS-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SS-1. A street sweeper removes sediment and potential pollutants along the curb line at a construction site. Photo courtesy of Tom Gore. Description Street sweeping and vacuuming remove sediment that has been tracked onto roadways to reduce sediment transport into storm drain systems or a surface waterway. Appropriate Uses Use this practice at construction sites where vehicles may track sediment offsite onto paved roadways. Design and Installation Street sweeping or vacuuming should be conducted when there is noticeable sediment accumulation on roadways adjacent to the construction site. Typically, this will be concentrated at the entrance/exit to the construction site. Well-maintained stabilized construction entrances, vehicle tracking controls and tire wash facilities can help reduce the necessary frequency of street sweeping and vacuuming. On smaller construction sites, street sweeping can be conducted manually using a shovel and broom. Never wash accumulated sediment on roadways into storm drains. Maintenance and Removal  Inspect paved roads around the perimeter of the construction site on a daily basis and more frequently, as needed. Remove accumulated sediment, as needed.  Following street sweeping, check inlet protection that may have been displaced during street sweeping.  Inspect area to be swept for materials that may be hazardous prior to beginning sweeping operations. Street Sweeping/ Vacuuming Functions Erosion Control No Sediment Control Yes Site/Material Management Yes Paving and Grinding Operations (PGO) SM-12 November 2010 Urban Drainage and Flood Control District PGO-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph PGO-1. Paving operations on a Colorado highway. Photo courtesy of CDOT. Description Manage runoff from paving and grinding operations to reduce pollutants entering storm drainage systems and natural drainageways. Appropriate Uses Use runoff management practices during all paving and grinding operations such as surfacing, resurfacing, and saw cutting. Design and Installation There are a variety of management strategies that can be used to manage runoff from paving and grinding operations:  Establish inlet protection for all inlets that could potentially receive runoff.  Schedule paving operations when dry weather is forecasted.  Keep spill kits onsite for equipment spills and keep drip pans onsite for stored equipment.  Install perimeter controls when asphalt material is used on embankments or shoulders near waterways, drainages, or inlets.  Do not wash any paved surface into receiving storm drain inlets or natural drainageways. Instead, loose material should be swept or vacuumed following paving and grinding operations.  Store materials away from drainages or waterways.  Recycle asphalt and pavement material when feasible. Material that cannot be recycled must be disposed of in accordance with applicable regulations. See BMP Fact Sheets for Inlet Protection, Silt Fence and other perimeter controls selected for use during paving and grinding operations. Maintenance and Removal Perform maintenance and removal of inlet protection and perimeter controls in accordance with their respective fact sheets. Promptly respond to spills in accordance with the spill prevention and control plan. Paving and Grinding Operations Functions Erosion Control No Sediment Control No Site/Material Management Yes Appendix C (Landscape Plan) Appendix D (Copies of Permits/Applications) For Agency Use Only Permit Number Assigned COR03- Date Received /_ /_ Month Day Year COLORADO DISCHARGE PERMIT SYSTEM (CDPS) STORMWATER DISCHARGE ASSOCIATED WITH CONSTRUCTION ACTIVITIES APPLICATION PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED. Please print or type. Original signatures are required. All items must be completed accurately and in their entirety for the application to be deemed complete. Incomplete applications will not be processed until all information is received which will ultimately delay the issuance of a permit. If more space is required to answer any question, please attach additional sheets to the application form. Applications must be submitted by mail or hand delivered to: Colorado Department of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Drive South WQCD-P-B2 Denver, Colorado 80246-1530 Any additional information that you would like the Division to consider in developing the permit should be provided with the application. Examples include effluent data and/or modeling and planned pollutant removal strategies. PERMIT INFORMATION Reason for Application: NEW CERT RENEW CERT EXISTING CERT # Applicant is: Property Owner Contractor/Operator A. CONTACT INFORMATION - NOT ALL CONTACT TYPES MAY APPLY * indicates required *PERMITTEE (If more than one please add additional pages) *ORGANIZATION FORMAL NAME: 1) *PERMITTEE the person authorized to sign and certify the permit application. This person receives all permit correspondences and is legally responsible for compliance with the permit. Responsible Position (Title): Currently Held By (Person): Telephone No:_ email address Organization: Mailing Address: City:_ State: Zip: This form must be signed by the Permittee (listed in item 1) to be considered complete. Per Regulation 61 In all cases, it shall be signed as follows: a) In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the application originates. b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. d) In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official page 1 of 5 revised April 2011 2) DMR COGNIZANT OFFICIAL (i.e. authorized agent) the person or position authorized to sign and certify reports required by the Division including Discharge Monitoring Reports *DMR’s, Annual Reports, Compliance Schedule submittals, and other information requested by the Division. The Division will transmit pre-printed reports (ie. DMR’s) to this person. If more than one, please add additional pages. Same As 1) Permittee Responsible Position (Title): Currently Held By (Person): Telephone No:_ email address Organization: Mailing Address: City:_ State: Zip: Per Regulation 61 : All reports required by permits, and other information requested by the Division shall be signed by the permittee or by a duly authorized representative of that person. A person is a duly authorized representative only if: (i) The authorization is made in writing by the permittee (ii) The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and (iii) The written authorization is submitted to the Division 3) *SITE CONTACT local contact for questions relating to the facility & discharge authorized by this permit for the facility. Same As 1) Permittee Responsible Position (Title): Currently Held By (Person): Telephone No:_ email address Organization: Mailing Address: City:_ State: Zip: 4) * BILLING CONTACT if different than the permittee Responsible Position (Title): Currently Held By (Person): Telephone No:_ email address Organization: Mailing Address: City:_ State: Zip: Page 2 of 5 revised April 2011 5) OTHER CONTACT TYPES (check below) Add pages if necessary: ResponsiblePosition (Title): Currently Held By (Person): Telephone No:_ email address Organization: Mailing Address: City:_ State: Zip: o Pretreatment Coordinator o Environmental Contact o Biosolids Responsible Party o Property Owner Inspection Facility Contact Consultant Compliance Contact Stormwater MS4 Responsible Person Stormwater Authorized Representative Other B. Permitted Project/Facility Information Project/Facility Name Street Address or cross streets (e.g., “S. of Park St. between 5th Ave. and 10th Ave.”, or “W. side of C.R. 21, 3.25 miles N. of Hwy 10”; A street name without an address, intersection, mile marker, or other identifying information describing the location of the project is not adequate. For linear projects, the route of the project should be described as best as possible with the location more accurately indicated by a map.) City, Zip Code County Facility Latitude/Longitude— (approximate center of site to nearest 15 seconds using one of following formats 001A Latitude . Longitude . (e.g., 39.703°, 104.933°’) degrees (to 3 decimal places) degrees (to 3 decimal places) or 001A Latitude º ’ " Longitude º ’ " (e.g., 39°46'11"N, 104°53'11"W) degrees minutes seconds degrees minutes seconds For the approximate center point of the property, to the nearest 15 seconds. The latitude and longitude must be provided as either degrees, minutes, and seconds, or in decimal degrees with three decimal places. This information may be obtained from a variety of sources, including: o Surveyors or engineers for the project should have, or be able to calculate, this information. o EPA maintains a web-based siting tool as part of their Toxic Release Inventory program that uses interactive maps and aerial photography to help users get latitude and longitude. The siting tool can be accessed at www.epa.gov/tri/report/siting_tool/index.htm o U.S. Geological Survey topographical map(s), available at area map stores. o Using a Global Positioning System (GPS) unit to obtain a direct reading. Note: the latitude/longitude required above is not the directional degrees, minutes, and seconds provided on a site legal description to define property boundaries. C. MAP (Attachment) If no map is submitted, the permit will not be issued. Map: Attach a map that indicates the site location and that CLEARLY shows the boundaries of the area that will be disturbed. Maps must be no larger than 11x17 inches. D. LEGAL DESCRIPTION Legal description: If subdivided, provide the legal description below, or indicate that it is not applicable (do not supply Township/Range/Section or metes and bounds description of site) Subdivision(s): Lot(s): Block(s): OR Not applicable (site has not been subdivided) page 3 of 5 revised April 2011 E. AREA OF CONSTRUCTION SITE Total area of project site (acres): Area of project site to undergo disturbance (acres): Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover Total disturbed area of Larger Common Plan of Development or Sale, if applicable: (i.e., total, including all phases, filings, lots, and infrastructure not covered by this application) Provide both the total area of the construction site, and the area that will undergo disturbance, in acres. Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover (see construction activity description under the APPLICABILITY section on page 1). If the project is part of a larger common plan of development or sale (see the definition under the APPLICABILITY section on page 1), the disturbed area of the total plan must also be included. F. NATURE OF CONSTRUCTION ACTIVITY Check the appropriate box(s) or provide a brief description that indicates the general nature of the construction activities. (The full description of activities must be included in the Stormwater Management Plan.) Single Family Residential Development Multi-Family Residential Development Commercial Development Oil and Gas Production and/or Exploration (including pad sites and associated infrastructure) Highway/Road Development (not including roadways associated with commercial or residential development) Other – Description: G. ANTICIPATED CONSTRUCTION SCHEDULE Construction Start Date: ___________________________ Final Stabilization Date: _____________________________ Construction Start Date - This is the day you expect to begin ground disturbing activities, including grubbing, stockpiling, excavating, demolition, and grading activities. Final Stabilization Date - in terms of permit coverage, this is when the site is finally stabilized. This means that all ground surface disturbing activities at the site have been completed, and all disturbed areas have been either built on, paved, or a uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre-disturbance levels. Permit coverage must be maintained until the site is finally stabilized. Even if you are only doing one part of the project, the estimated final stabilization date must be for the overall project. If permit coverage is still required once your part is completed, the permit certification may be transferred or reassigned to a new responsible entity(s). H. RECEIVING WATERS (If discharge is to a ditch or storm sewer, include the name of the ultimate receiving waters) Immediate Receiving Water(s): Ultimate Receiving Water(s): Identify the receiving water of the stormwater from your site. Receiving waters are any waters of the State of Colorado. This includes all water courses, even if they are usually dry. If stormwater from the construction site enters a ditch or storm sewer system, identify that system and indicate the ultimate receiving water for the ditch or storm sewer. Note: a stormwater discharge permit does not allow a discharge into a ditch or storm sewer system without the approval of the owner/operator of that system. page 4 of 5 revised April 2011 I. REQUIRED SIGNATURES (Both parts i. and ii. must be signed) Signature of Applicant: The applicant must be either the owner and/or operator of the construction site. Refer to Part B of the instructions for additional information. The application must be signed by the applicant to be considered complete. In all cases, it shall be signed as follows: (Regulation 61.4 (1ei) a) In the case of corporations, by the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the form originates b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. d) In the case of a municipal, state, or other public facility, by either a principal executive officer, ranking elected official, (a principal executive officer has responsibility for the overall operation of the facility from which the discharge originates). STOP!: A Stormwater Management Plan must be completed prior to signing the following certifications! i. STORMWATER MANAGEMENT PLAN CERTIFICATION “I certify under penalty of law that a complete Stormwater Management Plan, has been prepared for my activity. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the Stormwater Management Plan is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for falsely certifying the completion of said SWMP, including the possibility of fine and imprisonment for knowing violations.” XX Signature of Legally Responsible Person or Authorized Agent (submission must include original signature) Date Signed Name (printed) Title ii. SIGNATURE OF PERMIT LEGAL CONTACT "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." “I understand that submittal of this application is for coverage under the State of Colorado General Permit for Stormwater Discharges Associated with Construction Activity for the entirety of the construction site/project described and applied for, until such time as the application is amended or the certification is transferred, inactivated, or expired.” XX Signature of Legally Responsible Person (submission must include original signature) Date Signed Name (printed Title DO NOT INCLUDE A COPY OF THE STORMWATER MANAGEMENT PLAN DO NOT INCLUDE PAYMENT – AN INVOICE WILL BE SENT AFTER THE CERTIFICATION IS ISSUED. page 5 of 5 revised April 2011 COLORADO DISCHARGE PERMIT SYSTEM (CDPS) For Agency Use Only Permit Number Assigned COG07-______________ Date Received ____/____/____ Month Day Year CONSTRUCTION DEWATERING INDUSTRIAL WASTEWATER DISCHARGE APPLICATION PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED. Please print or type. Original signatures are required. All items must be completed accurately and in their entirety for the application to be deemed complete. Incomplete applications will not be processed until all information is received which will ultimately delay the issuance of a permit. If more space is required to answer any question, please attach additional sheets to the application form. Applications must be submitted by mail or hand delivered to: Colorado Department of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Drive South WQCD-P-B2 Denver, Colorado 80246-1530 Any additional information that you would like the Division to consider in developing the permit should be provided with the application. Examples include effluent data and/or modeling and planned pollutant removal strategies. PERMIT INFORMATION Reason for Application: NEW CERT RENEW CERT EXISTING CERT #____________________ Applicant is: Property Owner Contractor/Operator A. Contact Information Permittee (If more than one please add additional pages) Organization Formal Name: ___________________________________________________________ 1. Permittee the person authorized to sign and certify the permit application. This person receives all permit correspondences and is legally responsible for compliance with the permit. Responsible Position (Title): ______________________________________________________________ Currently Held By (Person): _______________________________________________________________ Telephone No:__________________________________________________________________________ email address__________________________________________________________________________ Organization: ___________________________________________________________________________ Mailing Address: ________________________________________________________________________ City:_______________________________ State: ______________________ Zip: ____________________ This form must be signed by the Permittee to be considered complete. Per Regulation 61: In all cases the permit application shall be signed as follows: a) In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the application originates. b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. d) In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official Page 1 of 6 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com 2. DMR Cognizant Official (i.e. authorized agent)—the person or position authorized to sign and certify reports required by permits including Discharge Monitoring Reports [DMR’s], Annual Reports, Compliance Schedule submittals, and other information requested by the Division. The Division will send pre-printed reports (e.g. DMR’s) to this person. If more than one, please add additional pages. Same as 1) Permittee Responsible Position (Title): _______________________________________________________ Currently Held By (Person): ________________________________________________________ Telephone No:___________________________________________________________________ Email address____________________________________________________________________ Organization: ____________________________________________________________________ Mailing Address: _________________________________________________________________ City:______________________________ State: ______________ Zip: ______________________ Per Regulation 61: All reports required by permits, and other information requested by the Division shall be signed by the permittee or by a duly authorized representative of that person. A person is a duly authorized representative only if: (i) The authorization is made in writing by the permittee; (ii) The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and (iii) The written authorization is submitted to the Division. 3. Site/Local Contact—contact for questions regarding the facility & discharges authorized by this permit Same as Permittee—Item 1 Responsible Position (Title): ________________________________________________________ Currently Held By (Person): _________________________________________________________ Telephone No:____________________________________________________________________ Email address_____________________________________________________________________ Organization: _____________________________________________________________________ Mailing Address: __________________________________________________________________ City:______________________________ State: ______________ Zip: _______________________ 4. Operator in Responsible Charge Same as Permittee—Item 1 Responsible Position (Title): __________________________________________________________ Currently Held By (Person): ___________________________________________________________ Telephone No:______________________________________________________________________ Email address______________________________________________________________________ Organization: _______________________________________________________________________ Mailing Address: ____________________________________________________________________ City:_______________________________ State: ______________ Zip: ________________________ Certification Type____________________Certification Number________________________________ Page 2 of 6 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com 5. Billing Contact (if different than the permittee) Responsible Position (Title): _____________________________________________________________ Currently Held By (Person): ______________________________________________________________ Telephone No:_________________________________________________________________________ Email address_________________________________________________________________________ Organization: __________________________________________________________________________ Mailing Address: _______________________________________________________________________ City:______________________________ State: ______________ Zip: ____________________________ 6. Other Contact Types (check below) Add pages if necessary: Responsible Position (Title): ______________________________________________________________ Currently Held By (Person): _______________________________________________________________ Telephone No:__________________________________________________________________________ Email address__________________________________________________________________________ Organization: ___________________________________________________________________________ Mailing Address: ________________________________________________________________________ City:______________________________________ State: ______________ Zip: _____________________ Pretreatment Coordinator Environmental Contact Biosolids Responsible Party Property Owner Inspection Facility Contact Consultant Compliance Contact Stormwater MS4 Responsible Person Stormwater Authorized Representative Other ____________________ B. Permitted Project/Facility Information 1. Project/Facility Name ____________________________________________________________________________ Street Address or cross streets_____________________________________________________________________ City, State and Zip Code _____________________________________________County _____________________ Type of Facility Ownership City Government Corporation Private Municipal or Water District State Government Mixed Ownership _________________________________ 2. Facility Latitude/Longitude—List the latitude and longitude of the excavation(s) resulting in the discharge(s). If the exact excavation location(s) are not known, list the latitude and longitude of the center point of the construction project. If using the center point, be sure to specify that it is the center point of construction activity. 001A Latitude __________ . _________ Longitude ___________ . _____________ (e.g., 39.703°, 104.933°’) degrees (to 3 decimal places) degrees (to 3 decimal places) or 001A Latitude _____ º _____’ _____" Longitude _____ º _____’ _____" (e.g., 39°46'11"N, 104°53'11"W) degrees minutes seconds degrees minutes seconds Horizontal Collection Method: GPS Unspecified Interpolation Map – Map Scale Number__________ Reference Point: Project/Facility Entrance Project/Facility Center/Centroid Horizontal Accuracy Measure (WQCD Requires use of NAD83 Datum for all references)___________________ (add additional pages if necessary) Page 3 of 6 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com B. Permitted Project/Facility Information Continued… 3. Facility Activity and Anticipated Schedule Dewatering will begin (date) _______________ Estimate how long dewatering will last: Years____________Months_______________Days_________________ Describe Activity e.g., highway bridge and tunnel construction, storm drain expansion, etc. and a description of activities being performed, including construction schedule and months of operation. Specify source(s) of wastewater to be discharged (i.e.well, foundation excavation, trenching, etc). 4. Will the discharge go to a ditch or storm sewer? YES NO If YES, in the appropriate table below include the name of the ultimate receiving waters where the ditch or storm sewer discharges. If YES, applicant must contact the owner of the ditch or storm sewer system (prior to discharging) to verify local ordinances and to determine whether or not additional requirements are going to be imposed by the owner. 5. What type of discharge will this be? Defined Discharge Undefined Discharge A Defined Discharge is a discharge where the dewatering discharge locations and number of outfalls are known at the time of permit application. If discharge is Defined – enter information in table C for Defined Discharges An Undefined Discharge is a discharge where the exact dewatering discharge locations are unknown at the time of permit application. The permit applicant must request the maximum number of potential outfalls (discharges) for the permitted facility. If discharge is Undefined – enter information in table D for Undefined Discharges Note: For undefined discharges, the site specific sampling and monitoring parameters will be selected based on the potential pollutant sources found within the entire permitted project area and will be applied to all outfall(s). The most stringent of the surface water limitations for each identified site specific parameter will be applied to each permitted outfall. C. Information for Defined Discharge Location(s): 1. In the following table, include the following information for the discharge: Include the number of discharge points (outfalls); Include the name of the receiving stream for each Outfall Number. If the discharge is to groundwater fill out discharge information located next to G001A, G002A, etc.—Please review the Division’s Low Risk Discharge Guidance for Discharges of Uncontaminated Groundwater to Land to determine if discharges to groundwater can be allowed under the Guidance in lieu of obtaining a Construction Dewatering Permit.; Include the approximate location of the discharge (e.g. ―discharge will occur between 5th Avenue and 20th Avenue‖, or ―the discharge will enter the storm sewer located at the corner of Speer Blvd and 8th Ave., which eventually flows to Cherry Creek‖ ; Include the maximum anticipated flow rate of the discharge; this can be based on pump capacity or other applicable measure. OUTFALL NUMBER RECEIVING STREAM(S) APPROXIMATE LOCATION OF DISCHARGE MAXIMUM FLOW RATE LATITUDE/LONGITUDE OF EACH DISCHARGE OUTFALL 001A 002A OUTFALL NUMBER GROUNDWATER APPROXIMATE LOCATION OF DISCHARGE MAXIMUM FLOW RATE LATITUDE/LONGITUDE OF EACH DISCHARGE OUTFALL G001A G002A Add more pages if necessary Page 4 of 6 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com D. Information for Undefined Discharge Location(s): 1. In the following table include the following information for the discharge: Include the maximum number of potential outfalls (discharges) for the permitted facility/project; Include the maximum anticipated flow rate of the discharge; this can be based on pump capacity or other applicable measure; Include the name of all potential receiving streams for the entire project. If the discharge is to groundwater fill out discharge information located next to G001A, G002A, etc.—Please review the Division’s Low Risk Discharge Guidance for Discharges of Uncontaminated Groundwater to Land to determine if discharges to groundwater can be allowed under the Guidance in lieu of obtaining a Construction Dewatering Permit. Note: For undefined discharges, the site specific sampling and monitoring parameters will be selected based on the potential pollutant sources found within the entire permitted project area and will be applied to all outfall(s). The most stringent of the surface water limitations for each identified site specific parameter will be applied to each permitted outfall. OUTFALL NUMBER MAXIMUM FLOW RATE (GPM) POTENTIAL RECEIVING STREAM(S) 001A 002A OUTFALL NUMBER MAXIMUM FLOW RATE (GPM) GROUNDWATER G001A GROUNDWATER G002A Add more pages if necessary Sampling and Reporting Requirements for Defined and Undefined Discharges: Sampling must occur at every end-of- pipe dewatering location (after going through your choice of BMP, if necessary). The permittee will be issued Discharge Monitoring Report (DMR) forms for all requested outfall numbers. The permittee will be required to submit the DMR forms for each requested outfall number monthly. For the outfall numbers(s) where no discharge occurred for a given month, the permittee shall mark ―No Discharge‖ on the DMR forms. The sampling results must be maintained by the permittee. E. A Location Map for Defined and Undefined Discharges—designating the location of the project/facility, the location of the discharge point(s)/outfalls—applicable only to defined discharges, and the receiving water(s) listed in Items C & D. A north arrow shall be shown. This map must be on paper that can be folded to 8 ½ x 11 inches. F. A Legible Sketch of the Site 1. For Defined Discharges—A legible site sketch shall be submitted and must include: the location of the end of pipe dewatering discharges at the site (e.g. where the flow will be discharged from the pump or BMP), the BMP(s) that will be used to treat the discharge(s), and the sampling location(s). Refer to the instructions for additional guidance specific to sites with multiple potential dewatering locations. This map must be on paper that can be folded to 8 ½ x 11 inches. OR 2. For Undefined Discharges—A legible site sketch shall be submitted and must include: the limits of the construction site boundary to include street names (if applicable) or landmarks; description of the BMPs to be implemented; and location of all potential receiving waters. This map must be on paper that can be folded to 8 ½ x 11 inches. G. Potential Groundwater Contamination 1. Is this operation located within one mile of a landfill, abandoned landfill or any mine or mill tailings? YES NO 2. Has the dewatering discharge been analyzed for any parameters (pH, Oil and Grease, Metals, Organics, etc.)? YES NO If YES, please attach a copy of the sampling results. Page 5 of 6 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com Note to the applicant: Upon review of the application, the Division may request characterization of the water to be discharged or analysis of certain parameters once the application has been reviewed. If the Division requests a representative analysis of the water to be discharged, the application processing time may be lengthened. 3. Has the dewatering area been checked for possible groundwater contamination, such as plumes from leaking underground storage tanks, mine tailings,etc –or- has a Phase I or Phase II been conducted on the site? YES NO If YES, show location of the landfill, tailings, or possible groundwater contamination on the location map or general sketch map. (Explain the location, extent of contamination, and possible effect on the groundwater pumping from this facility). Or include a copy of the phase I or Phase II report. If the reports are not available, submit a summary of the results of the report. If any sampling results are available, please attach a copy of all data. Note: Contact Water Quality Control Division for the proper water chemistry parameters to report. H. Additional Information 1. Does the applicant have a Stormwater Permit for Construction Activities? YES NO PENDING If Yes, Stormwater Construction Permit Number _________________________________ WATER RIGHTS The State Engineers Office (SEO) has indicated that any discharge that does not return water directly to surface waters (i.e.land application, rapid infiltration basins, etc.) has the potential for material injury to a water right. As a result, the SEO needs to determine that material injury to a water right will not occur from such activities. To make this judgment, the SEO requests that a copy of all documentation demonstrating that the requirements of Colorado water law have been met, be submitted to their office for review. The submittal should be made as soon as possible to the following address: Colorado Division of Water Resources 1313 Sherman Street, Room 818 Denver, Colorado 80203 Should there be any questions on the issue of water rights, the SEO can be contacted at (303) 866-3581. It is important to understand that any CDPS permit issued by the Division does not constitute a water right. The issuance of a CDPS permit does not negate the need to also have the necessary water rights in place. Additionally, if the activity has an existing CDPS permit, there is no guarantee that the proper water rights are in place. I. Required Certification Signature [Reg 61.4(1)(h)] "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." ―I understand that submittal of this application is for coverage under the State of Colorado General Permit for Discharges Associated with Construction Dewatering for the entirety of the construction site/project described and applied for, until such time as the application is amended or the certification is transferred, inactivated, or expired.‖ Signature (Legally Responsible Party)_________________________________________Date ________________ Name (printed) _____________________________________________Title______________________________ Page 6 of 6 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com Construction Dewatering Application Instructions Item A- Contact Information Permit Applicant: Provide the company, corporation, or organization name 1. Permittee—Identify the title and name of the individual who is the legally responsible for the permit. The requirement of who can be listed as the legally responsible party is included in the permit application. Include all requested information such as the legal party‘s phone number, email address and mailing address. The individual identified here must sign the permit application—Part I. 2. DMR Cognizant Official—Identify the title and individual‘s name 3. Site Contact—Identify the title and name of individual who is familiar with the day to day operations of the site. This person will have first-hand information regarding the construction site, discharges occurring on site, and implementation of BMPs. 4. Operator in Responsible Charge— Identify the title and individual‘s name if there is an Operator in Charge (Not required) 5. Billing Contact— Identify the title and individual‘s name 6. Other Contacts – Identify the title and individual‘s name for any of the listed descriptions (Not required) Item B – Permitted Project/Facility Information 1. Name of the project/facility and location; include the name of the project/facility and include a description of the location of the project/facility. The location may be a physical address or if the exact address is not available you may use an approximate address such as: the nearest intersection or boundary streets including directional identifiers (e.g., ―South of 14th Avenue between Sherman St. and Logan St.‖, or ―West side of C.R. 21, 3.25 miles North of Hwy 10‖) or other identifying information. A street name without an address, intersection, mile marker or other identifying information is not adequate. 2. Latitude/Longitude: For each excavation resulting in a discharge/outfall provide the Latitude/Longitude of the excavation. If the exact location of the disturbance resulting in discharge is not known, provide the lat/long of the center point of the construction activity. If identifying the center point of construction activity, make sure to write in ―center point‘ next to lat/long. The lat/long may be provided as decimal degrees or degrees, minutes, seconds format. This information can be obtained from a variety of sources, including:  Various Websites: http://terraserver.microsoft.com, http://geocoder.us/, or www.epa.gov/tri/reports/siting_tool/index.htm  U.S Geological Survey topographical map, available at area map stores  Surveyors or engineers for the construction project should have, or be able to calculate this information using a Global Positioning System (GPS) unit Specify whether the Latitude/Longitude information was collected either by using a GPS unit or through Map interpolation. 3. Facility Activity and Schedule: Include the anticipated start date of construction dewatering and provide the length of time dewatering is anticipated to last. Provide a description of the general nature of the construction activities that are requiring the dewatering. Also describe if the dewatering discharge is from an open excavation, such as a trench or foundation, or from groundwater lowering wells. Examples of activity descriptions may include: ‗open trench excavation for installation of 4,000 linear feet of new water lines‘, or ‗a series of shallow groundwater wells will be installed around the perimeter of the construction site in order to lower the water table for construction of a new 5,000 square foot music shop—all wells will be piped to one manifold resulting in one discharge location as indicated on our site sketch. 4. Discharges to ditches and storm sewers: Indicate by checking yes or no whether or not the immediate effluent will be discharged to a ditch or storm sewer. If yes is marked, the applicant must contact the owner of the ditch or storm sewer system prior to discharge to verify if the owner will allow a discharge to their system. The owner of the ditch/storm sewer system may impose additional requirements. Storm drainage systems are typically owned by the city or county they are located within, and therefore contacting the local city/county is the appropriate place to start. If yes is marked, in Table C or Table D be sure to include the location of the system and the ultimate receiving waters. 5. Defined or Undefined Discharge: Identify whether the applicant is applying for a Defined or Undefined discharge. A Defined Discharge is a discharge where the dewatering discharge locations are known at the time of permit application. If discharge is Defined – enter discharge information in Table C Page 1 of 3—Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com An Undefined Discharge is a discharge where the exact dewatering discharge locations are unknown at the time of permit application. The permit applicant must request the maximum number of potential outfalls (discharges) for the permitted facility/project. If discharge is Undefined – enter discharge information in Table D. The applicant must identify all potential receiving streams for the entire project. If the applicant is requesting undefined discharges, the site specific sampling and monitoring parameters will be selected based on the potential pollutant sources found within the entire permitted project area and will be applied to all outfall(s). The most stringent of the surface water limitations for each identified site specific parameter will be applied to each permitted outfall. For example, if the undefined project includes installation of 8 miles of linear pipeline and leaking underground storage tanks are expected to present in one section of the project, sampling and monitoring for Benzene, Toluene, Ethyl benzene, and Xylenes will be required for all requested outfall(s). Item C- Information for Defined Discharge Location(s). 1. If Defined Discharge was marked in Section B.5 fill out Table C. Table C requires the following information:  Number of discharge(s) (outfalls)—Identify the number of outfalls requested in Table C, this includes discharges to surface water and groundwater. If there are more than two requested discharges to surface water, attach a separate piece of paper including all requested information.  Name of the receiving water(s)—If the discharge is to a ditch, identify the ditch and the ultimate receiving water(s). Receiving waters are any waters of the state of Colorado, even if the natural drainage is usually dry. If discharge is to groundwater, then fill out the appropriate information within Table C next to G001A, G001A. If there are more than two discharges to groundwater, attach a separate piece of paper including all requested information. If the applicant is requesting a discharge to groundwater, please review the Division‘s Low Risk Discharge Guidance for Discharges of Uncontaminated Groundwater to Land. http://www.cdphe.state.co.us/wq/PermitsUnit/policyguidancefactsheets/policyandguidance/lowriskgwdischargeto land.pdf Discharges performed in accordance with the Guidance for Discharges of Uncontaminated Groundwater to Land do not require a separate construction dewatering permit.  Narrative description of the approximate location of the discharge—Include a narrative description of the discharge path. For example, ―the dewatering discharge will enter the storm sewer located at 6th Avenue and Sheridan which flows to Bear Creek‖ or ―the dewatering will discharge to a field located at 66 th and Farmers Road with potential to runoff to Sanders Creek‖. If there is more than one known discharge, include this descriptive information for all known discharges.  Maximum anticipated flow rate of the discharge (in gallons per minute)—Do not leave this section blank. Include the maximum flow rate. You may estimate the flow contribution based on pump capacity if data is not available.  Latitude/Longitude of each discharge location—Include the latitude/longitude of each discharge location. See the instructions B.2 for information on how to obtain latitude/longitude information. Item D- Information for Undefined Discharge Location(s). 1. If Undefined Discharge was marked in Section B.5 fill out Table D. Table D requires the flowing information:  Maximum number of potential outfalls (discharges) for the permitted facility—The applicant must identify the maximum number of discharge locations (outfalls) for the entire construction project. If more than 5 outfalls are requested, attach a separate piece of paper. DMRs will be sent to the permittee for each requested outfall.  Maximum anticipated flow rate of the discharge (in gallons per minute)—Do not leave this section blank. The flow rate may be estimated based on pump capacity if data is not available.  Name(s) of the all potential receiving stream(s)—Identify all potential receiving streams for the entire project. If the discharge is to groundwater then fill out the information in Table D next to G001A, G002A, etc. Page 2 of 3 Revised April 2011 Industrial Wastewater Discharge Permit – Construction Dewatering www.coloradowaterpermits.com Item E – Location Map—A location map is required to be submitted with all applications for both defined and undefined discharges. The location map must include the location of the project/facility, the approximate location of each defined discharge points, and the identified receiving water(s) listed in Items C or D. The map must have a minimum scale of 1:24000 (the scale of a USGS 7.5 minute map). A legible submittal is required on paper that can be folded to8 ½ by 11 inches. Item F- Detailed Sketch of the Site—If a defined discharge is requested please submit a detailed site sketch which includes the information requested in F.1. If an undefined discharge is requested please submit a detailed site sketch which includes the information requested in F.2. 1. Detailed Sketch of the Site for Defined Discharges—Must included a detailed sketch of the site showing the location of end of pipe dewatering discharge(s) at the site—to include the flow line of each requested dewatering discharge. The location and identification of the structural Best Management Practices (BMPs) used to treat the effluent prior to discharge. The map shall also include the sampling locations for each requested outfall. A legible submittal is required on paper that can be folded to 8 ½ by 11 inches. 2. Detailed Sketch of the Site for Undefined Discharges—This map must include the boundary of the construction site where all potential dewatering could occur. The boundaries should include a northern boundary, an eastern boundary, a southern boundary and a western boundary. The map must highlight or call out street names that border the project boundary. If streets are not available, landmarks or mile-markers must be identified. The map must highlight all potential receiving streams. The map must also include the identification of the structural BMPs used to treat the effluent prior to discharge. A legible submittal is required on paper that can be folded to 8 ½ by 11 inches. Item G—Potential Groundwater Contamination 1. Dewatering on/near Landfills, Mines, or Mill Tailings: If the dewatering project is located within one mile of a landfill, abandoned landfill, mine or mill tailings check yes. In addition, provide as much detail as possible regarding the extent of contamination and attach all sampling data. Indicate the location of the landfill, mine, etc. on the Location and Detail Maps.  Contamination plume information can be obtained from the following source: http://www.cdphe.state.co.us/hm/HMSiteCover.htm 2. Sampling Data: If any sampling data is available that is representative of the proposed discharge mark yes. Attach a copy of all sampling results to the application. If the data was collected for another agency or private company include a brief description as to why the data was collected. 3. Additional Sources of Contamination: Mark yes if the proposed construction site resulting in a dewatering discharge has been evaluated for any additional sources of contamination. Additional sources include underground storage tanks, dry cleaners, voluntary clean-up sites, etc. Also mark yes, if a Phase I or Phase II has been conducted on the property or adjacent properties. Attach a copy of all records (phase I, phase II, sampling efforts) that could help characterized the water to be discharged.  Contamination plume information can be obtained from the following source: http://www.cdphe.state.co.us/hm/HMSiteCover.htm Item H—Additional Information 1. Stormwater Permit for Construction Activities: If the applicant holds a stormwater permit for construction related activities (parcels > 1 acre) include the stormwater permit number. If you have applied, or intend to apply but have not yet obtained coverage and your certification number, indicate ―Pending‖ for this item. Item I—Signature Requirements—The permit applicant listed in Part A.1 must sign the permit application. Signatures must meet the requirements established in Regulation 61.4(1)(h). Page 3 of 3—Revised April 2011 Appendix E (Stormwater Management Plan Inspection Log) '3036%(3()4%681)283*86%274368%8-32 (%-0=78361;%8)603+ -REGGSVHERGI[MXLWYFWIGXMSR 7XSVQ[EXIV1EREKIQIRX*MIPH(EMP]-RWTIGXMSR6ITSVX-RWXVYGXMSRW -RWTIGXEPPIVSWMSRERHWIHMQIRXGSRXVSP&14WXLVSYKLSYXXLIIRXMVIGSRWXVYGXMSRWMXIzSFWIVZIVIGSVHERHHIXIVQMRIXLIMV IJJIGXMZIRIWW-JEHHMXMSREP&14WEVIRIIHIHSVER]&14MWRSXSTIVEXMRKIJJIGXMZIP]MXWLEPPFIVIGSVHIHSRXLMWJSVQERH EHHVIWWIHMQQIHMEXIP] 6IGSVHXLIWMXIPSGEXMSR '3036%(3()4%681)283*86%274368%8-32 (%-0=78361;%8)603+%((-8-32%04%+) (EXI 4VSNIGXRYQFIV 7YFEGGSYRXRYQFIV 8LIIRXMVIWMXIWLEPPFIMRWTIGXIHXSHIXIVQMRI[LIXLIV&14WEVIFIMRKMQTPIQIRXIHERHQEMRXEMRIHMREGGSVHERGI[MXLXLI TVSNIGXvWWMXIWTIGMJMG7;14ERHXLI'(477'48LI)VSWMSR'SRXVSP7YTIVZMWSV Appendix F (Contractor Inserts) Appendix G (Erosion Control Cost Estimate) Project Number: SPHLV0001.01 Location: Fort Collins, CO Date: July 23, 2014 Total Acres: 37.28 EROSION CONTROL MEASURE Units Estimated Quantity Unit Price Total Price L.F. 5055 $1.85 $9,351.75 each 16 $20.00 $320.00 each 2 $75.00 $150.00 Curb Inlet Protection (w/o grate) each 6 $75.00 $450.00 Concrete Washout each 1 $200.00 $200.00 Rock Sock each 4 $25.00 $100.00 Vehicle Tracking Contol Pad each 2 $700.00 $1,400.00 L.F. 420 $1.00 $420.00 per hour 40 $70.00 $2,800.00 acre 13.38 $1,325.00 $17,726.46 Sub-Total: $32,918.21 1.5 x Sub-Total: $49,377.32 Amount of security: $49,377.32 Total Acres x $1325/acre: $49,389.38 Cost to Re-seed: $49,389.38 Minimum escrow amount: $3,000.00 Erosion Control Escrow: $49,389.38 NOTE: 'Total Acres' represents total disturbed area. Area Inlet Protection Option 3 | Miniumum Escrow Amount Final Escrow Amount Timbervine Subdivision Erosion Control Cost Estimate Vegetate Landscaped Areas Option 1 | BMP Costs Silt Fence Sawcutting Pollution Prevention Street Sweeping and Cleaning Option 2 | Cost to Re-seed Disturbed acreage Straw Wattles (9" x 10' dimension) 7/23/2014 9:16 H:AM \Summer Park Holdings\CO, Fort Collins - SPHLV0001.01 - Timbervine\3. 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