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HomeMy WebLinkAboutTRAIL HEAD TRACTS F & G TOWNHOMES - FDP - FDP180005 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER MANAGEMENT PLANStormwater Management Plan For Trail Head Cottage Neighborhood February 2018 Prepared for: Trail Head, LLC 5013 Bluestem Court Fort Collins, CO 80525 Prepared by: JR Engineering, LLC 2900 South College Avenue, Suite 3D Fort Collins, Colorado 80525 Contact: Tim Halopoff, P.E. (303) 267-6230 JR Project No. 39145.51 Trail head Cottage Neighborhood Stormwater Management Plan i Project Name and Location: Trail Head Cottage Neighborhood is located in the southwest quarter of section 4, township 7 north, range 68 west of the 6th principal meridian in the city of Fort Collins, Larimer county, Colorado within tracts F & G of the Trail Head Subdivision. Owners’ Name and Address: Trail Head, LLC 5013 Bluestem Court Fort Collins, CO 80525 CERTIFICATION I herby affirm that this Stormwater Management Plan for the Trail Head Cottage neighborhood project was prepared under my direct supervision in accordance with the provisions of the Colorado Water Quality Control Act and the City of Fort Collins Stormwater Criteria Manual. JR Engineering does not and will not assume liability for the implementation of the methods, requirements and standards set forth in this report. Contractor names and Addresses: Contractor to complete this section. _______________________________________________________________________ (Contractor’s Name) _______________________________________________________________________ (Contractor’s Address) _______________________________________________________________________ (Contact) (Position or Title) Trail head Cottage Neighborhood Stormwater Management Plan ii STORMWATER MANAGEMENT PLAN CERTIFICATION “I certify under penalty of law that I have personally examined and am familiar with the information submitted in this application and all attachments and that, based on my inquiry of those individuals immediately responsible for obtaining the information, I believe that the information is true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine or imprisonment. “I understand the submittal of the 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.” "This Stormwater Management Plan fulfills the City of Fort Collins’ technical criteria to the best of my knowledge. I understand that additional erosion and sediment control measures may be needed if unforeseen erosion problems occur or if the submitted Plan does not function as intended. The requirements of this Plan shall run with the land and be the obligation of the land owner or contractor until such time as the plan is properly completed, modified, inactivated or voided." ______________________________________________________________________ Signature of Legally Responsible Person Date Signed ______________________________________________________________________ Name (printed) Title Trail head Cottage Neighborhood Stormwater Management Plan iii TABLE OF CONTENTS 1.0 SITE DESCRIPTION ............................................................................................. 1 1.1. Introduction................................................................................................... 1 1.2. Current Conditions......................................................................................... 1 1.3. Nature and Purpose of Construction .............................................................. 2 1.4. Wetlands and Receiving Waters..................................................................... 2 1.5. Rainfall Erodibility & Erosion Sediment Control Methods............................... 2 1.6. Non-Stormwater Discharge............................................................................ 3 2.0 STORMWATER MANAGEMENT CONTROLS ........................................................ 4 2.1. Controls Overview ......................................................................................... 4 2.2. Erosion and Sediment Controls ...................................................................... 4 2.2.1. Structural Practices (See drawings for locations) ........................................ 5 2.2.2. Non-Structural Practices (See drawings for locations) ................................ 6 2.2.3. Other Controls (See drawings for location) ................................................. 7 2.3. SWMP Administrator ..................................................................................... 8 2.4. Materials Management ................................................................................. 8 2.4.1. Potential Pollution Sources ........................................................................ 8 2.4.2. Pollution Prevention Measures .................................................................. 9 2.5. Spill Management ........................................................................................ 13 3.0 Dry Land Vegetation ........................................................................................ 14 3.1. Soil and Surface Conditions .......................................................................... 14 3.2. Seed Mixes .................................................................................................. 15 3.3. Mulches ....................................................................................................... 15 4.0 Detailed Sequence of Construction Activities .................................................. 15 5.0 Inspection and Maintenance ........................................................................... 16 5.1. Inspection and Maintenance Overview ........................................................ 16 5.2. Final stabilization and long term stormwater management ......................... 17 6.0 CONCLUSION ................................................................................................... 19 7.0 REFERENCES .................................................................................................... 20 APPENDICES Appendix A – Figures Figure 1-Vicinity Map Figure 2-Soil Map Figure 3-ESCROW Appendix B –Erosion Control Plan Trail head Cottage Neighborhood Stormwater Management Plan 1.0 SITE DESCRIPTION 1.1. Introduction This report represents the Stormwater Management Plan for construction of the Trail Head Cottage Neighborhood project. It was prepared to meet the regulatory requirements of the City of Fort Collins Stormwater Criteria Manual as well as the Colorado Department of Health, Water Quality Control Division in compliance with the provisions of the Colorado Water Quality Control Act, and the Federal Water Pollution Control Act. This plan serves as a consolidated document for information on water quality protection for the subject site and areas immediately adjacent. It should also be noted that this plan is a living document that will need to be updated and maintained throughout the construction process. The intent of this plan is to provide the contractor a tool to consolidate records, logs, permits, applications, etc. as well as guidance on water quality protection. The plan incorporates elements that can be found in the contract plans and specifications as well as in the City of Fort Collins Stormwater Criteria Manual. 1.2. Current Conditions Trail Head Cottage Neighborhood is located in the Southwest quarter of Section 4, Township 7 North, Range 68 West of the 6th Principal Meridian in the City of Fort Collins, Larimer County, Colorado within Tracts F & G of the Trail Head Subdivision. The site is bounded on the south by East Vine Drive and is surrounded on every other side by developed portions of the Trail Head Subdivision. A vicinity map is provided in Appendix A. More specifically, the Trail Head Cottage Neighborhood site is composed of approximately 5.19 and 5.54 acres of land within the existing Tracts F and G respectively. Both tracts of land are currently undeveloped, zoned LMN. Tract G generally slopes from the northeast to southwest with slopes ranging from 0.60% to 2.50%. The property is generally covered with sparse native grasses. Tract F generally slopes from the northwest to southeast with slopes ranging from 0.60% to 4.60%. The property is generally covered with sparse native grasses which have taken over the undeveloped site. When the Trail Head Subdivision was developed two large detention ponds with water quality measures were installed to handle the majority of the developments storm water runoff. Tract G utilizes an existing drainage system to convey storm water to the detention pond (Pond A) located on the southwest portion of the Trail Head Subdivision. Tract F utilizes an existing drainage system to convey storm water to the detention pond (Pond B) located on the southeast portion of the Trail Head Subdivision. Both of the existing storm sewer systems were designed to convey runoff from Tracts F & G in the ultimate developed condition. Trail head Cottage Neighborhood Stormwater Management Plan 1.3. Nature and Purpose of Construction The proposed use of the site is for attached single family townhomes. Tract F is 5.19 acres, and will contain 45 units. Tract G is 5.54 acres, and will contain 41 units. The total building coverage over the site will be 116,925 square feet. See Appendix A for a Vicinity Map. 1.4. Wetlands and Receiving Waters Trail Head Cottage Neighborhood lies within the Boxelder Creek/Cooper Slough Basin. The master study for this area is the “Drainage and Erosion Control Report for the Trail Head Property” by JR Engineering, dated October 13, 2004. The site is shown on FEMA FIRM panel 08069C0982F, dated December 19, 2006. The site lies within an area determined to be outside the 500yr floodplain. 1.5. Rainfall Erodibility & Erosion Sediment Control Methods Attached at the end of the this report are a series of drawings that describe the proposed site conditions, as well as the locations of the erosion control Best Management Practices (BMPs). The Erosion Control Plan depicts the anticipated drainage patterns after major grading activities and the anticipated locations for BMPs such as silt fence, inlet protection, and staging areas. It has been assumed that the majority of the surrounding areas will remain in their present state during the construction of this project. The Contractor will be responsible for implementing and maintaining the erosion and sediment control measures described in the document and the accompanying design drawings. The Contractor may designate these tasks to certain subcontractors as he sees fit, but the ultimate responsibility for implementing these controls and their proper function at each phase of the project remains with the Contractor. The order of major activities will be as follows: 1. Install vehicle tracking control and other perimeter soil erosion control measures. 2. Clear and rough grade for improvements. 3. Excavate and install improvements including underground piping, manholes, and drainage structures. 4. Fine grading. 5. Install trails. 6. Final stabilization. 7. Clean up. Trail head Cottage Neighborhood Stormwater Management Plan Construction Sequence Chart Mobilization Demolition Grading Utilities Installation Flat work Installation Vertical Installation Landscape Demobilization Best Management Practices (BMPs) Structural "Installation" Silt Fence Barriers* Vehicle Tracking Pad* Inlet Filter Bags* Any prior inlets that could use protecting Rock Bags* Any prior inlets that could use protecting Rip Rap Collecting Asphalt / Concrete Saw Cutting Waste *All BMPs to be Removed once Construction is Complete. Vegetative Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days. Mulching/Sealant Any time the site will sit dorment longer than 30 Days. Permanent Seeding Planting Sod Installation Rolled Products : Netting/Blankets/Mats Any time the site will sit dorment longer than 30 Days. 1.6. Non-Stormwater Discharge Non-stormwater discharges will be eliminated or reduced to the fullest extent feasible. This plan does not cover construction dewatering. Pumping or draining groundwater that has infiltrated into an excavation requires a general permit for construction dewatering, regardless of the size of the project. Stormwater that mixes with groundwater in an excavation is also subject to the controls in the general permit for Construction Dewatering. No materials shall be discharged in quantities that will have an adverse effect on the receiving waters. The measures listed below will be implemented to achieve these objectives. Trail head Cottage Neighborhood Stormwater Management Plan x Proper and lawful disposal of all waste materials. x Control any spills and leaks that may occur and clean up (mitigate). x Use of designated areas for equipment repair and cleaning. x Careful application of irrigation water. All potential pollutants used during construction other than sediment, will be handled and disposed of in a manner that does not contaminate storm water. All materials used during construction, which have the potential to impact storm water quality will be stored, managed, used and disposed of in a manner that minimizes the potential for releases to the environment, especially storm water. 2.0 STORMWATER MANAGEMENT CONTROLS 2.1. Controls Overview During construction, several controls and measures shall be implemented under the direction of the General Contractor to prevent offsite discharge of contaminated storm water. Controls for this project include erosion, sedimentation, stabilization, and other BMPs. Specifications and engineering drawings for the selected BMPs can be found on the drawing included in the back pocket of this. The contractor shall comply with the attached plans and guidelines as a minimum. Field conditions and unforeseen circumstances will dictate modifications to or additions to this Stormwater Management Plan. Where storm water pollution potential exists, appropriate preventative measures (BMPs) must be utilized and documented, whether such measures are identified in this report or not. 2.2. Erosion and Sediment Controls The objective of erosion control is to limit the amount of erosion occurring on disturbed areas until the site is stabilized. The objective of sediment control is to capture the soil that has been eroded before it leaves the construction site. Despite the use of both erosion and sediment control measures, it is recognized that some sediment could remain in runoff leaving the construction site. This should be minimized to the maximum extent practicable. The BMPs scheduled for use during the construction of this site can be divided into Structural and Non-Structural Practices. Section 2.2.1 of this report discusses the proposed structural BMPs to be utilized. Section 2.2.2 discusses the non-structural practices. Trail head Cottage Neighborhood Stormwater Management Plan 2.2.1. Structural Practices (See drawings for locations) Structural BMPs are structural site management practices that will minimize erosion and sediment transport. Such practices may include straw bales, silt fences, drainage swales, inlet protections, outlet protection, etc. The goal of structural BMPs on this project is to protect areas downstream of the site from turbid water, sediment, oils and other contaminants, which may mobilize during storm water flows. The structural BMPs that may be utilized on the subject site are depicted in the Drainage and Erosion Control Plan and are described in more detail as follows: Silt Fence: x A temporary vertical barrier of filter fabric attached to and supported by posts and entrenched into the ground. x Utilized to intercept sediment from disturbed areas during construction operations. x Used to filter shallow sheet flow. x Typically used along the toe of fills, in transition areas between cut and fills, and adjacent to streams. x Generally installed prior to or immediately following land-disturbance activity. x Shall be inspected periodically and after each rain or snowfall event and repaired when necessary. Sediment shall be removed from behind the fence when it accumulates to one-half the exposed fabric height. Sediments removed must be properly disposed. x Utilized as a temporary feature. Inlet Protection: x A barrier across or around a storm drain drop inlet, a curb inlet, or a culvert inlet. x Utilized to intercept and filter sediment-laden runoff and prevent it from entering storm drainage systems. x Not to be utilized in place of a sediment-trapping device. Used as a secondary control device. x Do not use where ponded water might flow onto the roadway. x Blocking of the inlet should not be watertight. x Generally installed prior to land-disturbance activity on existing inlets and immediately after the construction of new inlets. x Shall be inspected periodically and after each rain or snowfall event and repaired when necessary. Accumulated sediment shall be removed and properly disposed. x Utilized as a temporary feature. Outlet Protection: Trail head Cottage Neighborhood Stormwater Management Plan x A structurally lined apron (generally with riprap, grouted rip rap, or concrete) placed at the outlet of pipes or paved channel sections. x Used as an energy dissipation device to prevent scour and erosion at the outlet by reducing the velocity and energy of concentrated flow. x Shall be installed immediately following the construction of the upstream conveyance element. x Inspection shall be performed after high flows for scour and dislodged stones. Repairs shall be made immediately. x Utilized as a permanent feature. Grading Techniques: x Soil surface roughening, terracing and rounding at tops of cuts, transitions and roadway ditches to facilitate plant establishment and minimize erosion. x Utilized to temporarily stabilize disturbed areas and protect from wind and water erosion immediately after grading activities have ceased. x Used as a temporary practice during construction. x Inspection and maintenance must be provided periodically and after each rain or snowfall event that causes runoff to ensure roughened state is maintained. x Rills developed should be filled and the area re-graded immediately. Erosion control measures are the responsibility of the General Contractor to inspect and maintain. Any existing erosion control devices that are removed in order to complete the construction of the utilities shall be replaced immediately following the construction that required its removal unless directed otherwise by the construction plans. 2.2.2. Non-Structural Practices (See drawings for locations) Non-Structural BMPs are both interim and permanent stabilization practices. Such practices may include temporary seeding, permanent seeding, mulching, geotextiles, sod stabilization, vegetative buffer strips, tree protection, preservation of mature vegetation, etc. The non-structural BMPs that may be utilized on the subject site are described in more detail as follows: Temporary and Permanent Seeding: x Soil preparation, seeding, mulch tackifier and/or mulching shall be required for all disturbed areas that are not surfaced. x Exposed soils, which are not part of the active grading and/or construction activity, shall be stabilized. Trail head Cottage Neighborhood Stormwater Management Plan x Seeded areas shall be inspected frequently. If the seeded areas fail to establish, provide adequate ground coverage. If seeded areas are disturbed, the area should be re-seeded. x Permanent landscaping and vegetative cover is depicted on the Landscaping plans. Mulching: x Application of plant residues to the soil surface. Typical mulching material includes certified weed free hay or straw, certified under the Colorado Department of Agriculture Weed Free Forage Certification Program as regulated by the Weed Free Forage Act, Title 35, Article 27.5, CRS and wood cellulose fiber. x Utilized in combination with mulch tackifier for temporary erosion control (i.e., incomplete slopes, detour slopes, stockpiles). x Utilized in combination with mulch tackifier for temporary erosion control on slopes when seeding is not allowed due to seasonal constraints. x Used to cover permanent or temporary seed areas. Hydromulch shall not be done in the presence of free surface water. x Inspect frequently and reapply mulching in areas where the mulching has been loosened or removed. Mulch tackifier must be applied with additional applications of mulching. Mulch Tackifier: x An organic soluble powder adhesive used as a water slurry to adhere native hay, straw, hydromulch, or seed to a surface and together. x Used to cover disturbances as temporary cover for wind erosion. x Mulch movement indicates poor application and procedure mixture. x Proper application will bond mulch material together and to soil. x Inspect by touching mulch surface to determine if adhesion has occurred. Maintain Existing Vegetation: x Existing vegetation should be preserved where possible to prevent the migration of sediment. x Should be inspected regularly. x Establish and maintain buffers. x Areas beginning to show signs of erosion or soil transport may require additional emergency BMPs. 2.2.3. Other Controls (See drawings for location) Vehicle Tracking Control / Construction Entrance: x A temporary stabilized layer of aggregate underlined with geotextile or gravel located where traffic enters or exits the construction site. Trail head Cottage Neighborhood Stormwater Management Plan x The structure shall be constructed prior to any construction activity and maintained daily. x Stone shall be added and repairs performed as conditions require. x When mud is present and not easily removed by a tracking pad, tire washing should be implemented as needed. Tire washing operations should occur near the construction exit on a stabilized stone pad. Implementation of a tire washing area should include provisions for collecting wash water and directing it to an onsite pond. Tracking of Sediment onto Roads and Streets: x Public and private roadways shall be kept clear of accumulated sediment. Bulk clearing of accumulated sediment shall not include flushing the area with water. Sediment will be shoveled and or swept from the street and disposed of in a manner that prevents contamination of storm water or surface water runoff. 2.3. SWMP Administrator Implementation and management of the environmental aspects of this project under this SWMP Plan are the responsibilities of the General Contractor. The General Contractor shall ensure the all contractors providing services on the project have access to a copy of the SWMP Plan and appropriate training regarding storm water pollution prevention. The General Contractor, Building Contractor, Utility Installations Contractor, Grading Contractor and all other contractors and subcontractors shall be familiar with the SWMP Plan and their responsibilities on the plan. 2.4. Materials Management 2.4.1. Potential Pollution Sources It is anticipated that this construction project will not utilize any abnormal or atypical hazardous materials. The construction site will operate much like other typical construction projects. The following materials or substances are expected to be present onsite during construction: Concrete/Additives/Wastes Cleaning solvents Detergents Petroleum based products Paints/Solvents Pesticides Acids Fertilizers Solid and construction wastes Sanitary wastes Soil stabilization additives Activities on the site that may have an impact on stormwater include the following: Trail head Cottage Neighborhood Stormwater Management Plan x Equipment and/or vehicle washing x Fertilizers, chemicals, or other material storage x Vehicle maintenance or fueling x Waste incineration, treatment, storage or disposal x Off-site vehicle tracking x Loading/unloading areas x Concrete truck washout As construction progresses, specific areas shall be designated for vehicle maintenance and refueling, material and waste storage, construction equipment staging, and bathroom facilities. Management measures and procedures for these facilities are discussed later in the plan. 2.4.2. Pollution Prevention Measures Pollution prevention measures shall be utilized to prevent construction materials with the potential of polluting stormwater, such as those listed above, from coming in contact with runoff. Measures include good housekeeping and proper disposal of construction and demolition debris, equipment fuel, lubricants, paints and solvents, asphalt, concrete, topsoil and other materials, as well as controls which prevent sediments from being tracked off-site by construction vehicles, and proper control of any non-stormwater flows on-site. As previously stated, Best Management Practices (BMPs) are schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce pollution of public waters. BMPs also control site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. With regard to construction, these may include structural controls and nonstructural practices that are designed to prevent pollutants from entering water or direct the flow of water away from potential sources of pollution. For construction sites, there are three main types of BMPs, those that prevent erosion and sediment transport, others that prevent pollutants from construction materials from mixing with stormwater, and those that trap pollutants before they can be discharged. BMPs for most common construction materials and wastes with the greatest potential for adversely affecting stormwater quality are as follows: BMPs for Disturbed and Stored Soils: x Seeding and mulching should be completed for the site Trail head Cottage Neighborhood Stormwater Management Plan x Soil preparation, seeding, mulch tackifier and/or mulching shall be required for all disturbed areas that are not surfaced. x Exposed soils, which are not part of the active grading and/or construction activity, shall be stabilized. x Seeded areas shall be inspected frequently. If the seeded areas fail to establish, provide adequate ground coverage. If seeded areas are disturbed, the area should be re-seeded. x Permanent landscaping and vegetative cover is depicted on the Landscaping plans. BMPs for Vehicle Tracking of Sediment: x Use vehicle tracking pads at the entrances of construction x Public and private roadways shall be kept clear of accumulated sediment. Bulk clearing of accumulated sediment shall not include flushing the area with water. Sediment will be shoveled and or swept from the street and disposed of in a manner that prevents contamination of storm water or surface water runoff. x A temporary stabilized layer of aggregate underlined with geotextile or gravel located where traffic enters or exits the construction site. x The structure shall be constructed prior to any construction activity and maintained daily. x Stone shall be added and repairs performed as conditions require. x When mud is present and not easily removed by a tracking pad, tire washing should be implemented as needed. Tire washing operations should occur near the construction exit on a stabilized stone pad. Implementation of a tire washing area should include provisions for collecting wash water and directing it to an onsite pond BMPs for Management of Contaminated Soils: x Have equipment to contain and clean up spills of hazardous materials in the vicinity of where these materials are to be stored or used. x Contain and clean up spills immediately after they occur. Contact State or Local solid waste regulatory agency concerning information and procedures necessary to treat or dispose of contaminated soils. x Keep materials in a dry covered area and elevated from the ground. BMPs for Loading and Unloading Operations: x Select a loading and unloading area for the site BMPs for Outdoor Storage Activities: x Select an outdoor storage area for the site x When possible store equipment and material in covered areas Trail head Cottage Neighborhood Stormwater Management Plan BMPs for Equipment Maintenance and Fueling: x Fueling operations shall occur in a designated area. x Have equipment to contain and clean up petroleum spills in fuel storage areas or on board maintenance and fueling vehicles. x Where possible, store petroleum products and fuel vehicles in covered areas and construct dikes to contain spills. x Contain and clean up spills immediately. x Use preventive maintenance for onsite equipment such as checking for and fixing gas and oil leaks in construction vehicles on a regular basis. x Follow proper procedure for the handling and application of asphaltic substances. x Oversee all filling operations. x Fueling equipment and area shall be fenced and valving locked to prevent vandalism. BMPs for Significant Particulate Generating: x Use silt fence and inlet protection to protect the areas downstream of the site x Maintain and clean out any sediment that builds up around the inlet protection and silt fence BMPs for On-Site Waste Management: x Select a designated waste collection area onsite. x Provide an adequate number of containers with lids or covers that can be placed over the containers prior to rainfall. x When possible, locate containers in a covered area. x Arrange for waste collection before containers overflow. x If a container does spill, provide cleanup immediately. x Plan for additional containers and more frequent pickups during the demolition phase of construction. x Make sure that construction waste is collected, removed, and disposed of only at authorized disposal areas. x Check with local solid waste management agency for specific guidance. x Trash, debris and spoils shall be properly contained at the END of EACH day. BMPs for residual Concrete disposal: x Emptying or wash out of excess concrete may be allowed on site. Excess concrete and wash water should be disposed of in a manner that prevents contact between these materials and stormwater discharges from the site. x Residual concrete shall be discharged in specifically designated dike areas, which have been prepared to prevent contact between the concrete and/or washout and stormwater discharged from the site and/or ground water. Trail head Cottage Neighborhood Stormwater Management Plan x The hardened residue from the dike areas shall be disposed of in the same manner as other non-hazardous construction waste materials or may be broke up and utilized as deemed appropriate by the contractor. x The use of the washout area shall be temporary (less than one year). x Washing of trucks and masonry equipment is to be performed only at a designated concrete washout. No burying of wastes. BMPs for Sanitary/Septic Wastes: x Sanitary or septic wastes that are generated onsite should be treated or disposed of in accordance with State or local requirements. x If self-contained, temporary facilities are utilized, the domestic waste haulers should be contracted to regularly remove the sanitary and septic wastes and to maintain the facilities in good working order. x Any facilities to be connected to a sanitary sewer system should be properly hooked to the sanitary sewer system to prevent illicit discharges. x Untreated, raw sewage should never be discharged or buried onsite. x Contact local government and State regulatory agencies to ensure the compliance with State or local requirements. x If sewage is being discharged to the sanitary sewer, the local treatment works authority should be contacted. BMPs for pesticides: x Store pesticides in a dry covered area and elevate above the ground. x Provide curbs or dikes to contain possible spills. x Have measures on site to contain and clean up spills. x Strictly follow recommended application rates and recommended application methods. x Only a Certified Applicator shall use pesticides. BMPs for Fertilizers/Detergents: x Limit the application of fertilizers to the minimum area and minimum recommended amounts. x Reduce exposure of nutrients to storm water runoff by working the fertilizer deep into the soil. x Apply fertilizer more frequently, but at lower application rates. x Hydro seeding, where lime and fertilizers are applied to the ground surface in one application should be limited, where possible. x Limit the use of detergents onsite: wash water containing detergents should not be discharged to the storm system. x Implement good erosion and sediment control to help reduce the amount of fertilizers that can leave the site as well as sediments. x Fertilizers and detergents shall be stored in dry and covered area and elevated above the ground. Trail head Cottage Neighborhood Stormwater Management Plan x Berming shall be provided around the storage area to avoid contact with stormwater runoff. BMPs for Hazardous Wastes Disposal: x Check with local waste management authorities to determine what the requirements are for disposing of hazardous materials. x Use the entire product before disposing of the container. x Do not remove the original product label from the container. It contains important information. x Do not mix products together unless specifically recommended by the manufacturer. x The correct disposal of these products varies with the product utilized. Follow the manufacturers recommended method, which is often found on the label. 2.5. Spill Management Construction site supervisors should create and adopt a spill control plan that includes measures and procedures to stop the source of the spill, contain the spill, clean up, and disposal of contaminated materials. Key personnel shall be identified and trained to be responsible for spill prevention and control. The following measures would be appropriate for a spill prevention and response plan: x Store and handle materials to prevent spills. o Tightly seal containers. o Make sure all containers are clearly labeled. o Stack containers neatly and securely o Where possible, store containers on pallets in a covered area. x Reduce stormwater contact if there is a spill. o Have cleanup procedures clearly posted. o Have cleanup materials readily available. o Contain any liquid. o Stop the source of the spill. o Cover spill with absorbent material. x Dispose of contaminated materials according to manufacturer’s instructions or according to State or local requirements. x Identify personnel responsible for responding to a spill of toxic or hazardous materials. o Provide personnel spill response training. o Post names of spill response personnel. x Keep the spill area well ventilated. Additionally, records of spills, leaks, or overflows that result in the discharge of pollutants must be documented and maintained. Information such as the time and date, weather conditions, response procedure taken, response personnel involved, Trail head Cottage Neighborhood Stormwater Management Plan reasons for the spill, etc., shall be recorded for all occurrences in the SWMP Plan and on the map. Spill Categories are as follows: Minor Spills x Any event that involves 5 gallons or more and or involves the following: x Less than the reportable quantity x Stays within the permitted area x Does not threaten any stormwater conveyances Significant Spills x Reportable Quantity (SARA title III List of Lists, available from EPA for reportable quantity) x Any amount leaving the permitted area x And/or threatens any water conveyances. Hazardous Spills x Any substance requiring a MSDS response. x Procedure shall include but limited to: o Secure the area o Provide first aid o Notify emergency response personnel Some spills may need to be reported to the Division of Water Quality and the City of Fort Collins immediately. Specifically significant spills that are, 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), any spill that exceeds the reportable quantity, and any amount that leaves the permitted area must be reported. The Division’s toll- free 24-hour environmental emergency spill reporting line is 1-877-518-5608. Written documentation to both the CDPHE (Division) and the City of Fort Collins of significant spills should be provided within 5 days. 3.0 Dry Land Vegetation 3.1. Soil and Surface Conditions The Trail Head Cottage Neighborhood soils primarily consist of loamy soil, predominately Fort Collins loam. Fort Collins clay loam belongs to hydrologic soils Group C. Group C soils have a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate Trail head Cottage Neighborhood Stormwater Management Plan of water transmission. Runoff is moderately high, and the hazards of wind erosion are moderately low. See Appendix A for soil description and characteristics. 3.2. Seed Mixes A standard City of Fort Collins seed mix should be used for the site. If a standard mix is not used than a request to the City must be submitted of the preferred seed mix with the application rates. 3.3. Mulches Typical mulching material includes certified weed free hay or straw, certified under the Colorado Department of Agriculture Weed Free Forage Certification Program as regulated by the Weed Free Forage Act, Title 35, Article 27.5, CRS and wood cellulose fiber. Mulch should be utilized in combination with mulch tackifier for temporary erosion control (i.e., incomplete slopes, detour slopes, stockpiles) when seeding is not allowed due to seasonal constraints. Mulch is also used to cover permanent or temporary seed areas. The mulch should be inspected frequently and reapplied in areas where the mulch has been loosened or removed. Mulch tackifier must be applied with additional applications of mulching. 4.0 Detailed Sequence of Construction Activities Sequence of Land Disturbing Activity Chart Mobilization Demolition Grading Utilities Installation Flat work Installation Vertical Installation Landscape Demobilization Best Management Practices (BMPs) Structural "Installation" Silt Fence Barriers* Vehicle Tracking Pad* Inlet Filter Bags* Any prior inlets that could use protecting Rock Bags* Any prior inlets that could use protecting Rip Rap Collecting Asphalt / Concrete Saw Cutting Waste *All BMPs to be Removed once Construction is Complete. Vegetative Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days. Trail head Cottage Neighborhood Stormwater Management Plan Mulching/Sealant Any time the site will sit dorment longer than 30 Days. Permanent Seeding Planting Sod Installation Rolled Products : Netting/Blankets/Mats Any time the site will sit dorment longer than 30 Days. 5.0 Inspection and Maintenance 5.1. Inspection and Maintenance Overview A site inspection of all erosion control facilities shall be conducted at least once every two weeks and immediately following any significant precipitation or snowmelt event that could cause surface erosion and every 30 days for inactive construction projects. The inspection must determine if there is evidence of, or the potential for, pollutants entering the drainage system, and BMPs should be reviewed to determine if they still meet the design and operational criteria in the SWMP Plan and that they continue to adequately control pollutants at the site. The construction site perimeter, disturbed areas, discharge points and areas used for material storage that are exposed to precipitation shall be inspected for evidence of, or the potential for, pollutants entering the storm drainage system. Erosion and sediment control measures identified in this SWPM Plan and on the construction plans shall be observed to ensure that they are operating correctly. Any other structural BMPs that may require maintenance, such as secondary containment around fuel tanks or the conditions of spill response kits shall also be inspected. Stormwater items to be inspected include the following: x Condition & failures of structural & non-structural BMPSs x Perimeter and outfall structure x Evidence of spills, upsets & discharges x Maintaining accurate SWMP Plan documentation x Material Handling and storage x Good Housekeeping x Site Stabilization x Meet authorities during inspections x Update permit disturbed acreage x Equipment and vehicle storage area x Maintenance records of equipment, systems & operations The project site and the adjacent streets impacted by the construction shall be kept neat, clean and free of debris. The control measures and facilities need to be Trail head Cottage Neighborhood Stormwater Management Plan maintained in good working order. Any items that are not functioning properly or are inadequate should be promptly repaired or upgraded. The site shall be inspected by responsible personnel who are familiar with the site. Inspection and monitoring will follow the procedures outlined below: Minimum Monitoring (Inspection) Requirements: x Inspections of the construction site shall be conducted by the contractor (or agent) every two weeks and after significant storm events. x The qualified site superintendent familiar with this SWMP Plan /BMP shall perform the inspections. x The contractor shall certify the site is in compliance with the SWMP Plan /BMP and the permit by: o Ensuring that areas contributing significant storm water discharges related to the construction activities have been identified. o Evaluating preventive measures required by the SWMP Plan /BMP to insure they are adequate and has been properly implemented. o Points of discharge from the site will be inspected to check for signs of pollutant discharge. o Certifying the grade elevations and capacity of permanent sedimentation facilities. o Determining if additional control measures will need to be implemented. o Updating this SWMP Plan if new measures are implemented or existing controls are deleted. Based on the results of the inspection, the description of potential pollutant sources, and the pollution prevention and control measures that are identified within this plan shall be revised and modified as appropriate and as soon as practicable after such inspection. Typically corrective action shall commence immediately when a deficiency is observed. In addition to the inspections performed at least every 7 days, several daily inspections will be required. Each day when any type of construction activity has taken place onsite, qualified personnel provided by the General Contractor shall: x Inspect all onsite areas where petroleum products are stored, used or handled for spills and leaks from vehicles and equipment. x Inspect all onsite locations where vehicle enter or exit the site for evidence of offsite sediment tracking. 5.2. Final stabilization and long term stormwater management Permanent stabilization will be achieved by establishing a vegetative cover on all disturbed areas. The vegetative cover will be as specified on the Landscape Plan. Trail head Cottage Neighborhood Stormwater Management Plan Final stabilization shall be considered complete when all paving and landscaping are completed and the vegetative cover has been established with a density of at least 70 percent of pre-disturbance levels (including shrubs and trees). In general spring and fall encouraged whenever possible. Temporary and permanent seeding shall be completed within 14 days after grading has ceased and left to idle for more than 30 days. Care should be taken to complete seeding activities prior to November 1st for disturbed land intending to remain inactive for the winter months. Roughening and scarifying disturbed areas is allowed as a temporary stabilization with the following conditions: x During winter activity x Intended to seeded in the spring fall seasons x Intended to be active within 2-3 months of inactivity (with Stormwater approval) Management of storm water after completion of construction will be accomplished by utilizing the practices listed below: x Upon completion of construction, the site shall be inspected to ensure that all equipment, waste materials, and debris have been removed. x The site will be inspected to make certain that all graded surfaces have been landscaped or seeded with an appropriate ground cover. x Upon acceptance of final stabilization measures, all temporary BMP's shall be removed and proper function of inlets, drainage ways, or other storm water conveyance elements shall be restored. x The storm sewer systems and the detention pond will be returned to full capacity and the outlet structures will be checked to assure they are unclogged and in working order. The General Contractor shall be responsible for maintaining the storm water controls in good working order including removal measures until the Inactivation Notice is filed with the State. The state requires the Inactivation Notice be filed within 3 months of the proposed end of construction. Alternatively, permit responsibilities may be transferred or reassigned by submitting a Notice of Transfer and Acceptance of Terms or a Reassignment of Coverage if control of a portion of the site changes parties. Trail head Cottage Neighborhood Stormwater Management Plan 6.0 CONCLUSION This Stormwater Management Plan has been prepared in accordance with the criteria and methods described in the “State of Colorado General Permit Application and Stormwater Management Plan Guidance for Stormwater Discharges Associated with Construction Activity.” The drainage system has been designed to comply with the regulatory requirements of the City of Fort Collins Stormwater Criteria Manual. All temporary and permanent erosion and sediment control BMPs shall be inspected, maintained and repaired by the General Contractor as needed to ensure continued performance of their intended function. The General Contractor shall remove all temporary erosion and sediment control BMPs after stabilization is achieved or after temporary BMPs are no longer needed. Trapped sediment will be removed by the General Contractor or stabilized onsite. Disturbed soil areas resulting from removal of BMPs or the General Contractor will permanently stabilize vegetation as soon as possible. Trail head Cottage Neighborhood Stormwater Management Plan 7.0 REFERENCES 1. Urban Storm Drainage Criteria Manual (Volumes 1, 2, and 3), Urban Drainage and Flood Control District, (Rev. September 2017) 2. Stormwater Criteria Manual, City of Fort Collins Storm Water Utility, City of Fort Collins, Colorado, Updated January, 2016. 3. “Hydrologic Group Rating for Larimer County Area, Colorado”, USDA-Natural Resources Conservation Service, National Cooperative Soil Survey. Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov. Trail head Cottage Neighborhood Stormwater Management Plan APPENDIX A Figures TRAIL HEAD COTTAGE NEIGHBORHOOD DRAINAGE AND EROSION CONTROL REPORT Project No. 39145.51 FIGURE 1- VICINITY MAP Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/22/2017 Page 1 of 4 4493900 4493920 4493940 4493960 4493980 4494000 4494020 4494040 4494060 4494080 4494100 4493900 4493920 4493940 4493960 4493980 4494000 4494020 4494040 4494060 4494080 4494100 498850 498870 498890 498910 498930 498950 498970 498990 498850 498870 498890 498910 498930 498950 498970 498990 40° 35' 52'' N 105° 0' 49'' W 40° 35' 52'' N 105° 0' 42'' W 40° 35' 44'' N 105° 0' 49'' W 40° 35' 44'' N 105° 0' 42'' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,070 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as Hydrologic Soil Group Hydrologic Soil Group— Summary by Map Unit — Larimer County Area, Colorado (CO644) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 35 Fort Collins loam, 0 to 3 percent slopes C 4.9 95.0% 73 Nunn clay loam, 0 to 1 percent slopes C 0.1 1.7% 95 Satanta loam, 1 to 3 percent slopes B 0.1 2.3% 103 Stoneham loam, 5 to 9 percent slopes B 0.1 1.1% Totals for Area of Interest 5.1 100.0% Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/22/2017 Page 3 of 4 Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/22/2017 Page 4 of 4 Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/31/2018 Page 1 of 4 4493910 4493930 4493950 4493970 4493990 4494010 4494030 4494050 4493910 4493930 4493950 4493970 4493990 4494010 4494030 4494050 498620 498640 498660 498680 498700 498720 498740 498760 498780 498800 498820 498840 498620 498640 498660 498680 498700 498720 498740 498760 498780 498800 498820 498840 40° 35' 50'' N 105° 0' 59'' W 40° 35' 50'' N 105° 0' 48'' W 40° 35' 45'' N 105° 0' 59'' W 40° 35' 45'' N 105° 0' 48'' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,090 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 35 Fort Collins loam, 0 to 3 percent slopes C 5.9 98.4% 73 Nunn clay loam, 0 to 1 percent slopes C 0.1 1.6% Totals for Area of Interest 6.0 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/31/2018 Page 3 of 4 Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/31/2018 Page 4 of 4 Project: Disturbed Acres: 9.04 EROSION CONTROL BMPs Units Estimated Quantity Unit Price Total Price LF 5360 $2.00 $10,720.00 EA 19 $250.00 $4,750.00 EA 2 $100.00 $200.00 EA 1 $500.00 $500.00 EA 2 $1,000.00 $2,000.00 Sub-Total: $18,170.00 1.5 x Sub-Total: $27,255.00 Amount of security: $27,255.00 Total Acres x Price/acre: $22,600.00 $2,500.00 Sub-Total: $22,600.00 1.5 x Sub-Total: $33,900.00 Amount to Re-seed: $33,900.00 Minimum escrow amount: $3,000.00 Erosion Control Escrow: $33,900.00 Miniumum Escrow Amount Trail Head Cottage Neighborhood Unit Price of Seeding per acre: “The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times the cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid, whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three thousand dollars ($3,000) for commercial development” Inlet Protection (IP) Concrete Washout (CW) (add all other BMPs for the site in this list) Final Escrow Amount Erosion and Sediment Control Escrow/Security Calculation for The City of Fort Collins BMP Amount Silt Fence (SF) Vehicle Tracking Control (VTC) Reseeding Amount Stabelized Staging Area (SSA) 1/31/2018 2:53 PM X:\3910000.all\3914551\Word\Reports\SWMP\3914551 Escrow.xls Trail head Cottage Neighborhood Stormwater Management Plan APPENDIX B Erosion Control Plan Know what's City of Fort Collins, Colorado UTILITY PLAN APPROVAL CityDate Engineer WaterDate & Wastewater Utility StormwaterDate Utility ParksDate & Recreation TrafficDate Engineer Date EnvironmentalDate Planner Date Mobilization Demolition Grading Utilities Installation Flat work Installation Vertical Installation Landscape Demobilization Best Management Practices (BMPs) Structural "Installation" Silt Fence Barriers* Vehicle Tracking Pad* Inlet Filter Bags* Any prior inlets that could use protecting Rock Bags* Any prior inlets that could use protecting Rip Rap Collecting Asphalt / Concrete Saw Cutting Waste *All BMPs to be Removed once Construction is Complete. Vegetative Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days. Mulching/Sealant Any time the site will sit dorment longer than 30 Days. Permanent Seeding Planting Sod Installation Rolled Products : Netting/Blankets/Mats Any time the site will sit dorment longer than 30 Days. East Larimer County Water District UTILITY PLAN REVIEW Boxelder Sanitation District UTILITY PLAN REVIEW District Manager Date General Manager Date WAGON TRAIL RD. GREENFIELDS DR. GREEN LAKE DR. Know what's City of Fort Collins, Colorado UTILITY PLAN APPROVAL CityDate Engineer WaterDate & Wastewater Utility StormwaterDate Utility ParksDate & Recreation TrafficDate Engineer Date EnvironmentalDate Planner Date Mobilization Demolition Grading Utilities Installation Flat work Installation Vertical Installation Landscape Demobilization Best Management Practices (BMPs) Structural "Installation" Silt Fence Barriers* Vehicle Tracking Pad* Inlet Filter Bags* Any prior inlets that could use protecting Rock Bags* Any prior inlets that could use protecting Rip Rap Collecting Asphalt / Concrete Saw Cutting Waste *All BMPs to be Removed once Construction is Complete. Vegetative Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days. Mulching/Sealant Any time the site will sit dorment longer than 30 Days. Permanent Seeding Planting Sod Installation Rolled Products : Netting/Blankets/Mats Any time the site will sit dorment longer than 30 Days. East Larimer County Water District UTILITY PLAN REVIEW Boxelder Sanitation District UTILITY PLAN REVIEW District Manager Date General Manager Date GREENFIELDS DR. GREEN LAKE DR. CAMPFIRE DR. of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 12, Oct 10, 2017 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 20, 2015—Oct 15, 2016 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/31/2018 Page 2 of 4 of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 11, Sep 23, 2016 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 20, 2015—Oct 15, 2016 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/22/2017 Page 2 of 4