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Home My WebLink AboutFAIRWAY APARTMENTS - FDP210023 - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORT Erosion Control Report Fairway Lane Apartments Fort Collins, Colorado Date Submitted: September 8, 2021 Owner/Applicant: Fairway Apartments, LLC 1603 Oakridge Drive, Suite 101 Fort Collins, Colorado 80525 Jeff Jensen 970-227-0622 jeff@jensenlaplante.com Developer: Jensen LaPlante Development 1603 Oakridge Drive, Suite 101 Fort Collins, Colorado 80525 Jeff Jensen 970-227-0622 jeff@jensenlaplante.com Contractor: TBD Design Engineer: Sanderson Stewart 425 West Mulberry, Suite 201 Fort Collins, CO 80526 Charles Sonnier (970) 488-0169 csonnier@sandersonstewart.com Erosion Control Administrator: TBD 2 CERTIFICATION STATEMENT: I hereby certify that this Erosion Control Report for the Fairway Lane Apartments, Fort Collins, Colorado was prepared by me (or under my direct supervision) in accordance with the provisions of the City of Fort Collins Stormwater Criteria for the owners thereof. _______________________________________________ Charles Joseph Sonnier, Registered Professional Engineer State of Colorado Registration No. 48403 9/8/21 3 Table of Contents I. Project Description and Nature of Construction II. Potential Pollutant Sources III. Control Measures IV. Installation and Removal Sequence of Control Measures V. Maintenance and Inspection of Requirements VI. Final Vegetation and Stability Sanderson Stewart September 2021 Fairway Lane Apartments pg. 1 Project No. 20065 I. Project Description and Nature of Construction The proposed development is approximately 11 acres located at the northwest corner of the South College Avenue and West Fairway Lane intersection. The project site associated with this report encompasses existing Parcel Nos. 9602100006, 9602100012, 9602100015, and 9602109002. More specifically, the project site lies within the northeast corner of Section 3, Township 6 North, Range 69 West, latitude 40.5188, longitude - 104.5.0785. The site is generally bounded by the Fort Collins South Transit Center/Fossil Boulevard on the west, the Spradley Barr Ford car dealership on the north, College Avenue on the east and Fairway Lane on the south. Surrounding properties include: the Spradley Barr Ford car dealership adjacent to the property on the north side, Woodley’s Fine Furniture, Worldpac, and Florida Tile on the south side of Fairway Lane Road, and VCA Fort Collins Animal Hospital, and Fossil Ridge Animal Hospital east of South College Avenue. The existing project site is undeveloped and has several mature trees with the ground cover consisting of small shrubs and grasses. The site is mostly flat to minimally sloped. Generally, runoff from the site sheet flows to the east and south to the existing detention pond, travels through an existing 15” RCP pipe to a water quality facility on the Woodley’s property south of Fairway Lane. The flow is then conveyed through a curb chase onto College Avenue where it is picked up by curb inlets approximately 700 feet south and 1400 feet south of the Woodley’s property, and ultimately discharges into Fossil Creek. Flow then conveys southeast approximately 2.5 miles to the Fossil Creek Reservoir and then another 0.5 miles from the Fossil Creek Reservoir Outlet to the Cache La Poudre River. This project site sits within the FEMA Zone X, Area of Minimal flood Hazard, per FEMA FIRM Maps 08069C1000F, dated December 19, 2006. According to the NRCS website, the site consists of primarily Nunn clay loam, 1 to 3 percent slopes, and Fort Collins loam, 0 to 3 percent slopes, both classified as Type C soils. The soils have an erodibility factor of 0.28 to 0.43 which suggests a moderate susceptibility to sheet and rill erosion by runoff. Currently, the Site consists of approximately 905 vegetative ground cover with mostly short grass with areas of longer grasses. There are many trees on the site with most tree clusters toward the south end of the property. Very little existing impervious areas exist within the project limits mainly consisting of sidewalks that run parallel to adjacent streets. Groundwater depth was measured approximately 15 feet to 22 feet below existing ground. No known ground contamination is present, and no known riparian or sensitive areas are proximate to the project site. The proposed project will consist of eight new multi-family buildings, five garages, and one clubhouse. Proposed utility improvements will consist of storm sewer, sanitary sewer, and waterline improvements. Surface improvements will include driveway, parking lot, landscaped areas and concrete sidewalk surrounding the buildings. Off-site improvements will mainly consist of a sidewalk, a driveway connection, and an emergency access Sanderson Stewart September 2021 Fairway Lane Apartments pg. 2 Project No. 20065 connection on the north side of the site connecting to the adjacent property. Refer to Appendix A for Site Plan. Approximately 10.5 acres of the site is anticipated to be disturbed, which does not include the building footprint area. A summary of these areas is as follows: • Total Project Area: ±11.0 Acres • Total Area of Disturbance: ±10.5 Acres • Total Area of Staging/Storage: ±0.30 Acres • Total Areas for Hauling: N/A A proposed access from West Fairway Lane will be utilized as the main construction access. BMPs will be established prior to construction. Silt fencing will be installed around the construction limits which will remain in place until site is stabilized, and 70% ground cover is established. No known environmental impacts to wetland, streams and/or endangered species will occur during this project. Dewatering operations are not anticipated for this project. If, however, dewatering is required, State discharge permits will need to be obtained prior to performing any dewatering operations. II. Potential Pollutant Sources The following is a list of potential sources of pollutants and the associated prescribed control measures: 1. ALL DISTURBED AND STORED SOILS Yes - Approximately 10.5 acres are anticipated to be disturbed. Topsoil will be stripped and stockpiled in a few areas throughout the project site, as/if necessary. Some excavated soils may also be temporarily stockpiled within the site area as grading operations progress. Appropriate BMP measures, such as silt fencing, sediment control logs, inlet protection, sod, and seeding and mulch will be implemented to contain pollutants and stabilize disturbed and stockpile areas. 2. VEHICLE TRACKING OF SEDIMENTS Yes - Sediment tracked onto existing pavements will receive ongoing sweeping and/or scraping and collected for haul off. Equipment that requires washing will either be washed inside the property or be loaded directly onto a trailer and washed off-site. Vehicle tracking control will be implemented to help reduce erosion and to minimize sediment from entering adjacent streets. Rock socks and inlet protection shall be installed downstream of the project site to intercept and filter any pollutants prior to escaping the site. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 3 Project No. 20065 3. MANAGEMENT OF CONTAMINATED SOILS No - There are no contaminated soils anticipated on this site. 4. LOADING & UNLOADING OPERATIONS Yes - Workers will have sufficient parking within the project site and along adjacent streets. Equipment may be loaded and unloaded on-site to reduce soil transport off the site. Any loading of material will be done directly from the machine to the haul truck with appropriate containment BMP’s and clean up measures in place. 5. OUTDOOR STORAGE OF CONSTRUCTION MATERIALS, BUILDING MATERIALS, FERTILIZERS AND CHEMICALS Yes/Possibly - Although fertilizers may be used in the final stage of the project for stabilizing vegetation, they will not be stored onsite. Materials that are not anticipated to generate pollutants along with on-site construction vehicles will be stored/parked in a Stabilized Staging Areas located within the project site. 6. BULK STORAGE OF MATERIALS No - There are no bulk liquid chemicals or storage structures anticipated for this project. 7. VEHICLE AND EQUIPMENT MAINTENANCE AND FUELING Yes/Possibly - It is the intention that most, if not all, equipment requiring repair shall be loaded onto a trailer and repaired off-site in a proper facility. If necessary, all on-site equipment repair shall be performed within the Stabilized Storage Area where potential chemical discharge will be contained and hauled off. 8. SIGNIFICANT DUST OR PARTICULATE GENERATION PROCESSES - Yes - This project is not anticipated to generate much atmospheric pollution, however, water trucks will be utilized, as needed, and vehicle speeds will be limited to minimize dust emissions. Seeding/sodding of the disturbed area shall be implemented upon completion of the improvements to that area. If needed, water can be applied, and silt fence shall be installed as a wind break. The project will follow all requirements described in the Fugitive Dust Control Ordinance No. 004, 2016, Section 12-150 through 12-160. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 4 Project No. 20065 9. ROUTINE MAINTENANCE ACTIVITIES INVOLVING FERILIZERS, PESTICIDES, DETERGENTS, FUELS, SOLVENTS, OILS, ETC. Yes/Possibly - No routine maintenance is anticipated. If it’s needed, however, it is the intention that equipment shall be maintained off-site in a proper facility. Any emergency on-site equipment maintenance shall be performed within the Stabilized Storage Areas within the project site. Although the other referenced chemicals may be used during the project, they will not be stored onsite. 10. ON-SITE WASTE MANAGEMENT PRACTICES Yes - Any solid waste disposal will be collected and hauled off-site daily. Any waste types to be disposed of at the end of each day will be temporarily stored within the Stabilized Storage Areas within the project site. 11. CONCRETE TRUCK/EQUIPMENT WASHING Yes – A concrete washout area is located near the construction access and appropriate containment BMP’s and clean up measures will be utilized. 12. DEDICATED ASPHALT AND CONCRETE BATCH PLANTS No dedicated batch plants are proposed. 13. NON-INDUSTRIAL WASTE SOURCES Yes - A portable toilet will be utilized for non-industrial waste on-site. These receptacles will be located a minimum of 50 feet from any inlet structure and watercourse. Generated worker trash will be collected and transported off-site daily. 14. SAW CUTTING AND GRINDING Yes - Saw cutting of existing asphalt and concrete sidewalks throughout the project area will occur. Appropriate downstream BMPs along curb lines and inlet protection will be implemented along with street sweeping. 15. OTHER NON-STORMWATER DISCHARGES No - No other discharges, such as dewatering and/or wash water is anticipated for this project. 16. OTHER POTENTIAL SPILL SOURCES No - No other procedures or areas of potential spill sources are anticipated. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 5 Project No. 20065 III. Control Measures Installation and maintenance of temporary construction and permanent BMPs (structural and non-structural) shall be performed in accordance with the detail specification shown on the Erosion Control Detail Sheets in the Fairway Lane Apartments Utility Plan Set and the specifications contained within the Urban Storm Drainage Criteria Manual, Volume 3, Chapter 6 & 7. Structural Practices: 1. Silt Fencing – Silt fencing will be utilized as part of perimeter controls to prevent sediment from leaving the project site. Silt fencing will be used downgradient of grading operations and along West Fairway Lane and South College Avenue. 2. Rock/curb Socks – Rock socks shall be installed along new curb/gutter and valley gutters within the project site. Rock socks will also be installed along the existing curb/gutter within the adjacent streets and parking lot. 3. Sediment Control Log – Sediment Control Logs shall be installed along the back of proposed sidewalks to the north and west of the proposed detention pond area. 4. Inlet/Outlet Protection – Inlet protection shall be implemented to protect the existing and newly installed inlets on and off site. Outlet protection will also be utilized on the proposed outfalls within the proposed detention pond. The intent of these BMPs is to prevent sediment from flowing into said inlets and leaving the site. 5. Stabilized Staging Area – These BMPs will be used to contain any on- site construction parking, portable toilet and any non-pollutant generating materials. These will be located in a few locations within the project site. 6. Vehicle Tracking Control – Two small vehicle tracking control pads shall be provided at the north and south ends of the site to access the project site. The intent of these pads is to minimize the tracking of mud and sediment onto the adjacent paved surfaces. 7. Stockpile Management – The stockpiled material will be stabilized through this BMP utilizing silt fencing to contain potential sediment transport and stabilize the material through seeding and mulching. 8. Surface Roughening – Surface roughening will be performed on steeper slopes prior to achieving stabilization through seeding and sodding. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 6 Project No. 20065 Non-Structural Practices: 1. Permanent Sod/Seeding –Permanent sod and/or seeding will be used to re-establish vegetation within the graded areas and stabilization of the stockpiled material. See seeding instructions below. 2. Mulch – Mulch may be used, as needed, to assist in the taking of the seed by protecting the seedbed and stabilizing the soil by increasing infiltration and reducing runoff. Utilize hydromulch on graded 4H:1V or steeper slopes after seeding. Refer to Section VI of this report. 3. Street Sweeping – The adjacent streets and parking lots/drives shall be kept free of sediment that has been tracked onto it through construction activities. Sweeping or vacuuming should be conducted when there is noticeable sediment accumulation on the roadway, adjacent to and surrounding the construction site. IV. Installation and Removal Sequence of Control Measures The anticipated construction dates are as follows: • Approximate Start Date: February 1, 2022 • Approximate Completion Date: December 1, 2022 • Final Stabilization Anticipated By: May 1, 2023 The following sequence of construction, land disturbing activities, and BMP implementation are anticipated: 1. Apply for all necessary permits, as required. 2. Mobilization and perimeter erosion control installation: a. Perimeter Silt Fencing to be installed downstream of areas to be graded. b. Install Inlet Protection at existing receiving inlets. c. Install Vehicle Tracking Control. d. Install Stabilized Staging Area with Portable Toilet. 3. Obtain Building and Demolition Permits, as required. 4. Construction Staking and Earthwork: a. Perform construction staking. b. Perform grubbing and stripping of topsoil. c. Install landscape boulders at north end of building. d. Perform earthwork, grading and stockpiling. e. Stockpile topsoil and stabilize. 5. Install Stormwater Inlets/Piping and Hardscape: a. Install subsurface improvements. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 7 Project No. 20065 b. Install surface improvements. c. Stabilize any excess stockpiled material. 6. Install Landscaping Improvements: a. Install plantings, edgings, etc., as specified in landscape plan. 7. Stabilize a. Install silt fence around stockpiled material. b. Sod, Seed and mulch newly graded areas, stockpiled material, and disturbed areas. 8. Removal of Temporary BMPs a. Remove all BMPs except for the silt fencing and inlet/outlet protection. b. Remove all remaining temporary BMPs upon achieving 70% minimum vegetated ground cover. Re-seeding and additional mulch may be necessary along with other methods implemented to establish vegetation such as erosion control blanket and soil binders. All temporary perimeter controls necessary to prevent sediment and/or pollutants from leaving the site are to be installed prior to obtaining permits and the commencement of construction activities. V. Maintenance and Inspection of Requirements BMP Inspections: Routine and post-storm inspections of BMPs are essential to identify maintenance necessary for the BMPs to remain in effective operating conditions. The frequency of inspections is typically influenced by multiple factors including the weather, the phase of construction, activities on site, and the types of BMPs. In Colorado, the CDPS General Permit requires documented inspections on a biweekly basis and within 24 hours of a storm event, with some limited, temporary exceptions for inactive sites. UDFCD recommends spot-checking BMPs every workday. This is typically reasonable to achieve and can help to ensure that the BMPs remain in good working condition. When the site or portions of the site are awaiting final stabilization (e.g., vegetative cover), where construction is essentially complete, the recommended frequency of inspection is at least once every month. Be sure that this change is documented and in accordance with relevant permit requirements prior to reducing the inspection schedule. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 8 Project No. 20065 Maintenance: Proactive maintenance is fundamental to effective BMP performance. Rather than maintaining the BMP in a reactive manner following failure, provide proactive maintenance that may help to reduce the likelihood of failure. The types and frequencies of maintenance are BMP-specific. Maintain BMPs so that they function as intended. This includes removing accumulated sediment before it limits the effectiveness of the BMP. Identify needed maintenance activities during site inspections or during general observations of site conditions. Where BMPs have failed, repairs or changes should be initiated as soon as practical, to minimize the discharge of pollutants. Where the BMPs specified in the SWMP are not functioning effectively at the site, modifications should be made that may include different or additional layers of BMPs. When new BMPs are installed or BMPs are replaced, check the permit for documentation requirements. This may require communication with the owner and/or engineer and, at a minimum, should be documented in the inspection and maintenance records (logbook). The following is an abbreviated summary regarding inspection and maintenance for BMPs proposed for this project (also refer to erosion control details in the construction plans): 1. Silt Fencing – Inspect each workday and as soon as possible (always within 24-hours) following a storm that causes surface erosion. Repair or replacement shall occur immediately upon discovery of any failures. Upstream accumulated sediment (at approximately 6-inches) shall be removed, as needed to maintain the functionality of the BMP. 2. Construction Fencing – Inspect fences daily for damage and repair or replace as necessary. Fencing should be tight and not slumping. Post should be standing straight and secure in the ground. 3. Rock/curb Socks - Inspect each workday and as soon as possible (always within 24-hours) following a storm that causes surface erosion. Rock socks should be replaced if heavily soiled or damaged beyond repair. Accumulated upstream sediment should be removed when sediment is approximately ½ of the rock sock height. 4. Inlet Protection - Inspect each workday and as soon as possible (always within 24-hours) following a storm that causes surface erosion. Accumulated upstream sediment should be removed when sediment is approximately ½ of the rock sock height in front of inlet opening. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 9 Project No. 20065 5. Staked Sediment Control Logs – Logs shall be staked along the back of the installed curb to help prevent sediment from running off the disturbed ground onto the paved roads and gutters. Sediment buildup shall be removed as needed. Sediment logs will be replaced and reinstalled to maintain their effectiveness. 6. Stabilized Staging Area – Inspect each workday and as soon as possible (always within 24-hours) following a storm that causes surface erosion. Maintain them in effective operating condition with a stable surface cover of gravel, repair perimeter silt fence as necessary and follow good housekeeping practices. Rock shall be reapplied or regraded as necessary if rutting or underlying subgrade becomes exposed. 7. Vehicle Tracking Control – Inspect each workday and as soon as possible (always within 24-hours) following a storm that causes surface erosion. Rock shall be reapplied or regraded as necessary to maintain a consistent depth. 8. Concrete Washout Area – The washout area shall be installed before concrete placement begin. Signage shall be posted that clearly designates the washout area. Concrete waste shall be removed and disposed of as needed. 9. Stockpile Management – Inspect each workday and as soon as possible (always within 24-hours) following a storm that causes surface erosion. Repair perimeter silt fence as necessary. If perimeter protection needs to be removed to access stockpile, replace perimeter controls by end of workday. VI. Final Vegetation and Stability Usable stripped topsoil will be re-distributed over the exposed dirt in areas where fill was removed and areas of grading. Areas to receive seeding and mulching per the seeding instructions below shall be the following: • Exposed ground where construction activities are completed. • Stockpiled material for 60 days or more. • Other disturbed bare ground areas such as in the removed Stabilized Staging Area and areas that received construction traffic and general operations. • Proposed planting per the landscape plans is anticipated to take place between Fall 2022 and Spring 2023. Refer to the Final Stabilization and Project Completion notes on Sheet No. 2 of the construction plans associated with this report. Sanderson Stewart September 2021 Fairway Lane Apartments pg. 10 Project No. 20065 Seeding Instructions: Per the City of Fort Collins Land Use Code, Section 12-132, Soil shall be thoroughly loosened to a depth of not less than eight (8) inches and soil amendment shall be thoroughly incorporated into the soil to a depth of at least six (6) inches by tilling, discing, or other suitable method, at a rate of at least three (3) cubic yards of soil amendment per one thousand (1,000) square feet of area to be seeded, unless at least four (4) inches of loose top soil has been placed on the area after completion of construction activity on top of not less than four (4) inches of loosened subgrade soils. Seed shall be applied to a depth of ¼” to ½” and conform to the standards outlined in the seeding notes and details on Sheet Nos. 2 and 4 of the construction plans associated with this report. Seeded areas to be mulched and crimped per Note No. 55 of the Erosion Control Notes found in the final construction plans associated with this report. Crimped mulch shall be applied to a depth of 2” to 3”. Utilize hydromulch application on graded 4H:1V or steeper slopes after seeding. At the point the vegetation has reached 70% density and confirmed by the City of Fort Collins, the warranty period for Erosion Control will begin and any temporary Control Measures will be removed. References 1. City of Fort Collins, December 2018, Fort Collins Stormwater Criteria Manual. 2. City of Fort Collins, December 2019, Fort Collins City Land Use Code. 3. Mile High Flood District, 2001 (November 2010 with some sections updated April 2018), Urban Storm Drainage Criteria Manual, Volume 3, Stormwater Quality. 4. United States Department of Agriculture Natural Resources Conservation Service; Web Soil Survey; accessed on-line September 2019. APPENDIX 1. NRCS Soils Data 2. Erosion Control Plan 3. Erosion Control Notes 4. Erosion Control Details 5. Erosion Control Security Estimate Fairway Lane Apartments Fort Collins, Colorado APPENDIX 9 Custom Soil Resource Report Soil Map 448516044852004485240448528044853204485360448540044854404485480448516044852004485240448528044853204485360448540044854404485480493240 493280 493320 493360 493400 493440 493480 493240 493280 493320 493360 493400 493440 493480 40° 31' 12'' N 105° 4' 47'' W40° 31' 12'' N105° 4' 36'' W40° 31' 1'' N 105° 4' 47'' W40° 31' 1'' N 105° 4' 36'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 20 40 80 120 Meters Map Scale: 1:1,650 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 Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features 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 of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 15, Jun 9, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 11, 2018—Aug 12, 2018 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. Custom Soil Resource Report 10 Table—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 3.4 26.8% 74 Nunn clay loam, 1 to 3 percent slopes C 9.4 73.2% Totals for Area of Interest 12.9 100.0% Rating Options—Hydrologic Soil Group Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Custom Soil Resource Report 23 Physical Soil Properties This table shows estimates of some physical characteristics and features that affect soil behavior. These estimates are given for the layers of each soil in the survey area. The estimates are based on field observations and on test data for these and similar soils. Depth to the upper and lower boundaries of each layer is indicated. Particle size is the effective diameter of a soil particle as measured by sedimentation, sieving, or micrometric methods. Particle sizes are expressed as classes with specific effective diameter class limits. The broad classes are sand, silt, and clay, ranging from the larger to the smaller. Sand as a soil separate consists of mineral soil particles that are 0.05 millimeter to 2 millimeters in diameter. In this table, the estimated sand content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 millimeters in diameter. Silt as a soil separate consists of mineral soil particles that are 0.002 to 0.05 millimeter in diameter. In this table, the estimated silt content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 millimeters in diameter. Clay as a soil separate consists of mineral soil particles that are less than 0.002 millimeter in diameter. In this table, the estimated clay content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 millimeters in diameter. The content of sand, silt, and clay affects the physical behavior of a soil. Particle size is important for engineering and agronomic interpretations, for determination of soil hydrologic qualities, and for soil classification. The amount and kind of clay affect the fertility and physical condition of the soil and the ability of the soil to adsorb cations and to retain moisture. They influence shrink-swell potential, saturated hydraulic conductivity (Ksat), plasticity, the ease of soil dispersion, and other soil properties. The amount and kind of clay in a soil also affect tillage and earthmoving operations. Moist bulk density is the weight of soil (ovendry) per unit volume. Volume is measured when the soil is at field moisture capacity, that is, the moisture content at 1/3- or 1/10-bar (33kPa or 10kPa) moisture tension. Weight is determined after the soil is dried at 105 degrees C. In the table, the estimated moist bulk density of each soil horizon is expressed in grams per cubic centimeter of soil material that is less than 2 millimeters in diameter. Bulk density data are used to compute linear extensibility, shrink-swell potential, available water capacity, total pore space, and other soil properties. The moist bulk density of a soil indicates the pore space available for water and roots. Depending on soil texture, a bulk density of more than 1.4 can restrict water storage and root penetration. Moist bulk density is influenced by texture, kind of clay, content of organic matter, and soil structure. Physical Soil Properties---Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2021 Page 1 of 5 Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a saturated soil transmit water. The estimates in the table are expressed in terms of micrometers per second. They are based on soil characteristics observed in the field, particularly structure, porosity, and texture. Saturated hydraulic conductivity (Ksat) is considered in the design of soil drainage systems and septic tank absorption fields. Available water capacity refers to the quantity of water that the soil is capable of storing for use by plants. The capacity for water storage is given in inches of water per inch of soil for each soil layer. The capacity varies, depending on soil properties that affect retention of water. The most important properties are the content of organic matter, soil texture, bulk density, and soil structure. Available water capacity is an important factor in the choice of plants or crops to be grown and in the design and management of irrigation systems. Available water capacity is not an estimate of the quantity of water actually available to plants at any given time. Linear extensibility refers to the change in length of an unconfined clod as moisture content is decreased from a moist to a dry state. It is an expression of the volume change between the water content of the clod at 1/3- or 1/10-bar tension (33kPa or 10kPa tension) and oven dryness. The volume change is reported in the table as percent change for the whole soil. The amount and type of clay minerals in the soil influence volume change. Linear extensibility is used to determine the shrink-swell potential of soils. The shrink-swell potential is low if the soil has a linear extensibility of less than 3 percent; moderate if 3 to 6 percent; high if 6 to 9 percent; and very high if more than 9 percent. If the linear extensibility is more than 3, shrinking and swelling can cause damage to buildings, roads, and other structures and to plant roots. Special design commonly is needed. Organic matter is the plant and animal residue in the soil at various stages of decomposition. In this table, the estimated content of organic matter is expressed as a percentage, by weight, of the soil material that is less than 2 millimeters in diameter. The content of organic matter in a soil can be maintained by returning crop residue to the soil. Organic matter has a positive effect on available water capacity, water infiltration, soil organism activity, and tilth. It is a source of nitrogen and other nutrients for crops and soil organisms. Erosion factors are shown in the table as the K factor (Kw and Kf) and the T factor. Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water. Factor K is one of six factors used in the Universal Soil Loss Equation (USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the average annual rate of soil loss by sheet and rill erosion in tons per acre per year. The estimates are based primarily on percentage of silt, sand, and organic matter and on soil structure and Ksat. Values of K range from 0.02 to 0.69. Other factors being equal, the higher the value, the more susceptible the soil is to sheet and rill erosion by water. Erosion factor Kw indicates the erodibility of the whole soil. The estimates are modified by the presence of rock fragments. Erosion factor Kf indicates the erodibility of the fine-earth fraction, or the material less than 2 millimeters in size. Physical Soil Properties---Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2021 Page 2 of 5 Erosion factor T is an estimate of the maximum average annual rate of soil erosion by wind and/or water that can occur without affecting crop productivity over a sustained period. The rate is in tons per acre per year. Wind erodibility groups are made up of soils that have similar properties affecting their susceptibility to wind erosion in cultivated areas. The soils assigned to group 1 are the most susceptible to wind erosion, and those assigned to group 8 are the least susceptible. The groups are described in the "National Soil Survey Handbook." Wind erodibility index is a numerical value indicating the susceptibility of soil to wind erosion, or the tons per acre per year that can be expected to be lost to wind erosion. There is a close correlation between wind erosion and the texture of the surface layer, the size and durability of surface clods, rock fragments, organic matter, and a calcareous reaction. Soil moisture and frozen soil layers also influence wind erosion. Reference: United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. (http://soils.usda.gov) Physical Soil Properties---Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2021 Page 3 of 5 Report—Physical Soil Properties Three values are provided to identify the expected Low (L), Representative Value (R), and High (H). Physical Soil Properties–Larimer County Area, Colorado Map symbol and soil name Depth Sand Silt Clay Moist bulk density Saturated hydraulic conductivity Available water capacity Linear extensibility Organic matter Erosion factors Wind erodibility group Wind erodibility index Kw Kf T In Pct Pct Pct g/cc micro m/sec In/In Pct Pct 35—Fort Collins loam, 0 to 3 percent slopes Fort collins 0-4 36-43- 50 28-38- 48 16-19- 26 1.44-1.47 -1.50 4.23-28.23-42.3 4 0.15-0.15-0. 17 1.7- 2.0- 3.7 1.0- 1.5- 2.0 .43 .43 5 5 56 4-9 30-42- 45 20-26- 50 20-32- 35 1.45-1.49 -1.53 1.41-2.82-14.11 0.15-0.16-0. 17 2.1- 5.0- 5.7 0.5- 0.8- 1.0 .32 .32 9-16 30-42- 45 20-26- 50 20-32- 35 1.45-1.49 -1.53 1.41-2.82-14.11 0.15-0.16-0. 17 1.8- 4.6- 5.5 0.5- 0.8- 1.0 .32 .32 16-29 35-42- 45 25-37- 38 20-21- 30 1.49-1.50 -1.51 1.41-9.17-14.11 0.15-0.15-0. 17 0.8- 1.3- 3.6 0.0- 0.3- 0.5 .43 .43 29-80 35-42- 45 25-37- 38 20-21- 30 1.49-1.50 -1.51 1.41-9.17-14.11 0.15-0.15-0. 17 0.8- 1.3- 3.6 0.0- 0.3- 0.5 .43 .43 Physical Soil Properties---Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2021 Page 4 of 5 Physical Soil Properties–Larimer County Area, Colorado Map symbol and soil name Depth Sand Silt Clay Moist bulk density Saturated hydraulic conductivity Available water capacity Linear extensibility Organic matter Erosion factors Wind erodibility group Wind erodibility index Kw Kf T In Pct Pct Pct g/cc micro m/sec In/In Pct Pct 74—Nunn clay loam, 1 to 3 percent slopes Nunn 0-9 36-43- 45 17-26- 37 27-31- 38 1.39-1.41 -1.43 0.42-2.82-4.23 0.16-0.16-0. 17 3.3- 4.3- 6.8 1.0- 1.5- 2.0 .28 .28 5 6 48 9-13 25-32- 39 16-30- 40 35-38- 45 1.32-1.37 -1.42 0.42-0.92-1.41 0.14-0.16-0. 16 5.8- 6.6- 8.4 1.0- 1.5- 2.0 .28 .28 13-25 25-32- 39 16-30- 40 35-38- 45 1.43-1.46 -1.48 0.42-0.92-1.41 0.14-0.16-0. 16 5.6- 6.2- 8.2 0.5- 0.8- 1.0 .32 .32 25-38 35-41- 65 2-30- 45 20-29- 33 1.42-1.49 -1.56 1.41-2.82-14.11 0.12-0.17-0. 17 1.8- 3.5- 4.4 0.0- 0.3- 0.9 .37 .37 38-80 37-41- 65 2-29- 48 15-30- 33 1.44-1.50 -1.56 1.41-2.82-42.34 0.10-0.17-0. 17 1.1- 3.7- 4.5 0.0- 0.3- 0.9 .32 .32 Data Source Information Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 15, Jun 9, 2020 Physical Soil Properties---Larimer County Area, Colorado Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/6/2021 Page 5 of 5 DOG PARK BLDG 7 BLDG 5 BLDG 6 BLDG 4 BLDG 3 BLDG 2 BLDG 8 BLDG 1LOT 1SOUTH TRANSIT CENTER SUBDIVISIONLOT 1 SPRADLEY BARR FORD SUBDIVISION LOT 1 WEBERG, P.U.D.SOUTH COLLEGE AVENUE (SH 287)FOSSIL BLVDWEST FAIRWAY LANE 0 50 SCALE: 1" = 50' 1002550 FINAL DEVELOPMENT PLANNORTH NOTE: -EXISTING UNDERGROUND INSTALLATIONS & PRIVATE UTILITIES SHOWN ARE INDICATED ACCORDING TO THE BEST INFORMATION AVAILABLE TO THE ENGINEER. THE ENGINEER DOES NOT GUARANTEE THE ACCURACY OF SUCH INFORMATION. SERVICE LINES (WATER, POWER, GAS, STORM, SEWER, TELEPHONE & TELEVISION) MAY NOT BE STRAIGHT LINES OR AS INDICATED ON THE PLANS. STATE LAW REQUIRES CONTRACTOR TO CALL ALL UTILITY COMPANIES BEFORE EXCAVATION FOR EXACT LOCATIONS. -UNLESS OTHERWISE SPECIFIED, ALL CONSTRUCTION LAYOUT AND STAKING SHALL BE PERFORMED UNDER THE RESPONSIBLE CHARGE OF A LAND SURVEYOR LICENSED IN THE STATE WHERE THE PROJECT IS LOCATED AND BY A PARTY CHIEF OR ENGINEERING TECHNICIAN EXPERIENCED IN CONSTRUCTION LAYOUT AND STAKING TECHNIQUES AS ARE REQUIRED BY THE SPECIFIC TYPE OF WORK BEING PERFORMED.FILE:PROJECT NO:CAD:QUALITY ASSURANCE:DRAWING HISTORYDATE DESCRIPTIONOVERALL GRADING PLANFAIRWAY LANE APARTMENTSCOLLEGE AVE & FAIRWAY LANEFORT COLLINS, COLORADOC4.0 CJS20065_EC PLAN_PROD.DWGERB9/8/211ST FDP SUBMITTAL--------------------------200065CONSTRUCTION SEQUENCE: 1.APPLY FOR ALL REQUIRED PERMITS FOR PROPOSED WORK. 2.INSTALL STABILIZED STAGING AREA AND VEHICLE TRACKING CONTROL. 3.INSTALL PERIMETER SILT FENCING AND SEDIMENT CONTROL LOGS. 4.INSTALL INLET PROTECTION. 5.OBTAIN BUILDING/DEMO PERMITS, AS REQUIRED. 6.PERFORM STRIPPING, GRUBBING AND STABILIZE STOCKPILED MATERIALS. 7.PERFORM EARTHWORK. 8.STABILIZE STOCKPILED MATERIALS AND GRADED/DISTURBED AREAS, AS REQUIRED. 9.INSTALL UTILITIES, PAVEMENTS AND REMAINING IMPROVEMENTS. 10.INSTALL LANDSCAPE IMPROVEMENTS. 11.SOD/SEED AND MULCH NEWLY GRADED AND DISTURBED AREAS. 12.REMOVE ALL TEMPORARY BMPs ACCEPT FOR PERIMETER CONTROLS, INLET PROTECTION IN GRASSED AREAS AND OUTLET PROTECTION. 13.REMOVE PERIMETER CONTROLS UPON ESTABLISHED 70% VEGETATED GROUND COVER. PROJECT CONTROL/DATUM: VERTICAL DATUM: NGS BENCHMARK "Y402", ELEVATION = 5018.96 (NAVD88 VERTICAL DATUM) HORIZONTAL DATUM: COLORADO STATE PLANE COORDINATES NAD 83(2011) DATUM. HORIZONTAL CONTROL BASED UPON VRS NETWORK SOLUTION. THIS DRAWING IS AT MODIFIED STATE PLANE. TO REDUCE TO STATE PLANE COORDINATES, SCALE AT 0.99973332 (1.00026675) ABOUT THE ORIGIN 0,0. EROSION CONTROL CALCULATION TABLE TOTAL PROJECT AREA ±11.0 ACRES TOTAL AREA OF DISTURBANCE (ON-SITE ONLY)±10.5 ACRES TOTAL AREA OF STAGING/STORAGE ±0.30 ACRES TOTAL AREAS/ROADS FOR HAULING N/A HEAVY OFF-SITE CONSTRUCTION TRAFFIC N/A APPROX. % AREA DISTURBED AT ANY ONE TIME 50 % EXISTING SOIL TYPE C APPROX. DEPTH TO GROUNDWATER 15' TO 22' NUMBER OF PHASES 1 TOTAL VOLUME IMPORT TO/EXPORT FROM PROJECT ±1,500 CY IMPORT TOTAL AREA OFF-SITE STOCKPILING OF FILL FROM PROJECT OR BORROW FROM STRIPPING THE OFF-SITE AREA (SF/AC) N/A STEEPEST SLOPE (EXISTING/PROPOSED)27%/25% DISTANCE FROM SENSITIVE AREA (WEST TO EAST)N/A CONTOUR NOTE: ·PROPOSED AND EXISTING CONTOURS ARE SHOWN AT 5' MAJOR AND 1' MINOR AREA OF GRADING = 457,380 SF (10.5 ACRES) EARTHWORK QUANTITIES CUT 3,500 CY FILL 5,000 CY EROSION CONTROL LEGEND STOCKPILE MANAGEMENT STABILIZED STAGING AREA PERMANENT SEEDING OR SOD SILT FENCE STREET SWEEPING SURFACE ROUGHNING GENERAL NOTES 1.THE CONTRACTOR IS RESPONSIBLE FOR OBTAINING ALL REQUIRED PERMITS PRIOR TO COMMENCEMENT OF ANY WORK ON THE PROJECT. 2.THE CONTRACTOR SHALL BE SOLELY AND COMPLETELY RESPONSIBLE FOR THE CONDITIONS AT AND ADJACENT TO THE JOB SITE, INCLUDING SAFETY OF ALL PERSONS AND PROPERTY, DURING THE PERFORMANCE OF THE WORK. THIS REQUIREMENT SHALL APPLY CONTINUOUSLY AND SHALL NOT BE LIMITED TO NORMAL WORKING HOURS. THE DUTY OF THE CITY TO CONDUCT CONSTRUCTION REVIEW OF THE CONTRACTOR'S PERFORMANCE IS NOT INTENDED TO INCLUDE REVIEW OF THE ADEQUACY OF THE CONTRACTOR'S SAFETY MEASURES IN, ON, OR NEAR THE CONSTRUCTION SITE. 3.NO CONSTRUCTION DEBRIS OR MUD SHALL BE TRACKED ONTO ADJACENT STREETS. IF ANY TRACKING DOES OCCUR, IT SHALL BE CLEANED IMMEDIATELY BY THE CONTRACTOR. 4.THE CONTRACTOR SHALL PROVIDE ALL LIGHTS, SIGNS, BARRICADES, FLAG PERSONS, OR OTHER DEVICES NECESSARY TO PROVIDE FOR PUBLIC SAFETY IN ACCORDANCE WITH THE CURRENT MANUAL ON UNIFORM TRAFFIC CONTROL DEVICES. 5.THE CONTRACTOR IS RESPONSIBLE FOR THE PROTECTION OF ALL SURVEY MONUMENTS. ANY MONUMENT THAT MUST BE DESTROYED FOR CONSTRUCTION SHALL BE REPLACED. THE CONTRACTOR SHALL ENGAGE THE SERVICES OF A LICENSED SURVEYOR PRIOR TO DISTURBING ANY MONUMENTS. 6.IT IS THE CONTRACTOR'S RESPONSIBILITY TO NOTIFY THE OWNER AND THE ENGINEER OF ANY PROBLEMS IN IT IS THE CONTRACTOR'S RESPONSIBILITY TO NOTIFY THE OWNER AND THE ENGINEER OF ANY PROBLEMS IN CONFORMING TO THESE PLANS FOR ANY ELEMENT OF THE PROPOSED IMPROVEMENTS PRIOR TO ITS CONSTRUCTION. 7.CONTRACTOR SHALL COORDINATE THE IMPROVEMENTS WITH AND PROVIDE NOTIFICATION OF CONSTRUCTION SCHEDULING TO THE OWNER OF ANY BUSINESS WHERE PROPOSED IMPROVEMENTS MAY AFFECT THE DAILY OPERATIONS OF THAT OWNER'S BUSINESS. 8.CONTRACTOR SHALL OBTAIN OWNER APPROVAL FOR ANY IMPROVEMENTS NOT CONTAINED WITHIN THESE PLANS. 9.IT IS THE RESPONSIBILITY OF THE CONTRACTOR DURING CONSTRUCTION ACTIVITIES TO RESOLVE CONSTRUCTION PROBLEMS DUE TO CHANGED CONDITIONS ENCOUNTERED DURING THE PROGRESS OF ANY PORTION OF THE PROJECT. 10.CONTRACTOR SHALL BE RESPONSIBLE FOR THE PROTECTION OF ALL EXISTING OVERHEAD AND UNDERGROUND UTILITIES. IF A UTILITY IS DAMAGED DURING CONSTRUCTION, THEN IT SHALL BE REPAIRED BY THE CONTRACTOR AT NO EXPENSE TO THE OWNER. CONTRACTOR SHALL COORDINATE WITH UTILITY OWNER/PROVIDER REGARDING ANY RE- ROUTING, REMOVAL, AND/OR MODIFICATION TO ANY EXISTING UTILITY LINE AND/OR APPURTENANCE. CONTRACTOR TO COORDINATE WITH A LICENSED ELECTRICIAN, AS REQUIRED, REGARDING ON - SITE ELECTRICAL ABANDONMENT,RE- ROUTING AND/OR PRESERVATION. 11.ALL EXISTING UTILITIES SHOWN IN THESE PLANS ARE APPROXIMATE AND SOME UTILITIES MAY NOT BE SHOWN AT ALL. SITE CONTRACTOR SHALL VERIFY THE HORIZONTAL AND VERTICAL LOCATION OF ALL EXISTING UTILITIES SHOWN OR NOT SHOWN IN THESE PLANS PRIOR TO CONSTRUCTION. CALL UTILITY NOTIFICATION CENTER OF COLORADO 811 ROCK SOCK CONCRETE WASHOUT AREA OVERLAND FLOW ARROW VEHICLE TRACKING CONTROL INLET PROTECTION STAKED SEDIMENT CONTROL LOG LIMITS OF CONSTRUCTION OUTLET PROTECTION FINAL DEVELOPMENT PLANFILE:PROJECT NO:CAD:QUALITY ASSURANCE:DRAWING HISTORYDATE DESCRIPTIONEROSION CONTROL NOTESFAIRWAY LANE APARTMENTSCOLLEGE AVE & FAIRWAY LANEFORT COLLINS, COLORADOC7.0 CJS20065_DETAIL_PROD.DWGERB9/8/211ST FDP SUBMITTAL--------------------------200065“” “” FINAL DEVELOPMENT PLANFILE:PROJECT NO:CAD:QUALITY ASSURANCE:DRAWING HISTORYDATE DESCRIPTIONEROSION CONTROL DETAILSFAIRWAY LANE APARTMENTSCOLLEGE AVE & FAIRWAY LANEFORT COLLINS, COLORADOC7.1 CJS20065_DETAIL_PROD.DWGERB9/8/211ST FDP SUBMITTAL--------------------------200065 FINAL DEVELOPMENT PLANFILE:PROJECT NO:CAD:QUALITY ASSURANCE:DRAWING HISTORYDATE DESCRIPTIONEROSION CONTROL DETAILSFAIRWAY LANE APARTMENTSCOLLEGE AVE & FAIRWAY LANEFORT COLLINS, COLORADOC7.2 CJS20065_DETAIL_PROD.DWGERB9/8/211ST FDP SUBMITTAL--------------------------200065 FINAL DEVELOPMENT PLANFILE:PROJECT NO:CAD:QUALITY ASSURANCE:DRAWING HISTORYDATE DESCRIPTIONEROSION CONTROL DETAILSFAIRWAY LANE APARTMENTSCOLLEGE AVE & FAIRWAY LANEFORT COLLINS, COLORADOC7.3 CJS20065_DETAIL_PROD.DWGERB9/8/211ST FDP SUBMITTAL--------------------------200065 Project:Disturbed Acres:10.5 EROSION CONTROL BMPs Units Estimated Quantity Unit Price Total Price LF 1,300 $2.50 $3,250.00 EA 16 $125.00 $2,000.00 EA 3 $125.00 $375.00 EA 1 $750.00 $750.00 EA 2 $1,380.00 $2,760.00 EA 21 $100.00 $2,100.00 LF 450 $1.50 $675.00 EA 3 $1,500.00 $4,500.00 EA 3 $2,000.00 $6,000.00 SY 3,815 $0.35 $1,335.25 LS 1 $1,500.00 $1,500.00 Sub-Total:$25,245.25 1.5 x Sub-Total:$37,867.88 Amount of security:$37,867.88 Total Acres x Price/acre:$12,600.00 $1,200.00 Sub-Total:$12,600.00 1.5 x Sub-Total:$18,900.00 Amount to Re-seed:$18,900.00 Minimum escrow amount:$3,000.00 Erosion Control Escrow:$37,867.88 Outlet Protection Erosion and Sediment Control Escrow/Security Calculation for The City of Fort Collins BMP Amount Silt Fence (SF) Vehicle Tracking Control (VTC) Surface Roughening Reseeding Amount Rock Socks Stabilized Staging Area Stockpile Management Sediment Control Logs Miniumum Escrow Amount Fairway Lane Apartments, Fort Collins, CO 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 Street Sweeping 9/4/2021 3:43 PM P:\20065_FC_Maverick_MF_PDP_FDP_S_College\STORMWATER\Erosion Control\Example_Escrow (2).xls