HARVEST PARK/ZIEGLER MIXED USE LOT 2 CITY OF FORT COLLINS, CO

Transcription

1 EROSION CONTROL REPORT / STORMWATER MANAGEMENT PLAN FOR HARVEST PARK/ZIEGLER MIXED USE LOT 2 CITY OF FORT COLLINS, CO Prepared by: Interwest Consulting Group 1218 West Ash, Suite C Windsor, Colorado Phone: Fax: Prepared for: ARCHITECTURE WEST, LLC 4710 South College Avenue Fort Collins, CO September 10, 2014

2 September 10, 2014 Mr. Jesse Schlam City of Fort Collins Stormwater 700 Wood Street Fort Collins, CO RE: Erosion Control Report / Stormwater Management Plan for Ziegler Mixed Use Lot 2 Dear Jesse, I am pleased to submit for your review and approval, this Erosion Control Report / Stormwater Management Plan for the Harvest Park/Ziegler Mixed Use Lot 2 development. This report provides the City with an erosion control plan for the proposed development that addresses the topics outlined in the City Erosion Control Report Requirements. This plan mimics the State of Colorado General Permit and Stormwater Management Plan requirements. I appreciate your time and consideration in reviewing this submittal. Please call if you have any questions. Sincerely, Reviewed By: Skylar Brower, P.E. Robert Almirall, P.E. Colorado Professional Colorado Professional Engineer No Engineer No

3 TABLE OF CONTENTS 1. INTRODUCTION SITE DESCRIPTION BMPS FOR STORMWATER POLLUTION PREVENTION Erosion and Sediment Controls Materials Handling and Spill Prevention STORMWATER MANAGEMENT CONTROLS SWMP Administrator Identification of Potential Pollution Sources FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT INSPECTION AND MAINTENANCE City of Fort Collins Standard Erosion and Sediment Control Notes City of Fort Collins Erosion Control Security Calculations SWMP IMPLIMENTATION APPENDIX A BMP DETAILS... P APPENDIX B EROSION CONTROL PLAN AND SITE MAP... Q APPENDIX C CONSTRUCTION SEQUENCE... R APPENDIX D SOIL INFORMATION... S LIST OF FIGURES & TABLES Figure 1--Vicinity Map... 2 Table 6.1 Erosion Control Cost Estimate 14

4 1. INTRODUCTION The primary purpose of preparing and maintaining a stormwater management plan is to improve the health and quality of the State's urban waterways. The preparation and maintenance of the plan will contribute to this objective by facilitating an approach to stormwater management, establishing a program of actions to be used during construction activities, and describing stormwater management controls and various Best Management Practices (BMPs) necessary to reduce erosion, sediment and pollutants in stormwater discharge. Information concerning the State of Colorado General Permit and Stormwater Management Plan are not included in the appendices of this report. The site is over one acre and will require a SWMP permit, which will be the responsibility of the Contractor. 2. SITE DESCRIPTION The Ziegler Mixed Use development is located in southeast Fort Collins. It is located in the Southwest Quarter of Section 5, Township 6 North, Range 68 West of the Sixth Principal Meridian, in the City of Fort Collins, Larimer County, Colorado. See figure 1 on the next page for the vicinity map. The property is located west of Zeigler Road and will be split down the middle by the extension of County Fair Lane. The parcel north of County Fair Lane will be Lot 1 and the parcel south of County Fair Lane will be Lot 2. Lot 1 contains 1.32 acres and Lot 2 contains 2.71 acres. The project is bounded on the north and west by Harvest Park Subdivision, on the south by McClelland s Channel, and on the east by Ziegler Road. Only Lot 2 will undergo development at this time. Lot 1 will maintain the existing single family residence and be developed in the future. The project will extend County Fair Lane to Ziegler road as well as construct a new drive access for four multi-family buildings and associated driveways and parking spots on the southern half of the site. 1

5 Figure 1--Vicinity Map All paved areas are designed with a minimum slope of 0.5% and all grassed areas are designed with a minimum slope of 2.0%. Side slopes in grassed areas are graded to a maximum of 4:1. Runoff from the undeveloped north portion of the site will follow existing flow paths until it is cut off by County Fair Lane. The runoff will be conveyed via curb and gutter to a low point just west of the Ziegler intersection where it will be collected by two Type R inlets. Runoff from the proposed development on Lot 2 will be conveyed overland across 2

6 the 24 concrete drive to the south into the proposed water quality pond. Roof drains will either discharge on grade into a rain garden facility or be piped to the water quality pond. Existing soil types on site as classified by the NRCS Soil Survey of Larimer County are classified as Nunn clay loam, Nun clay loam wet, and Stoneham loam. Please refer to Table 2.1 for additional soil characteristics. Table 2.1: On-site Soil Characteristics Soil Type Percent of Site Hydrologic Soil Group K Factor 1 Wind Group 2 Nunn Clay Loam 71% C Nunn Clay Loam, Wet 21% C Stoneham Loam 8% B K factors range from 0.02 to The higher value, the more susceptible the soil is to sheet and rill erosion by water. 2 Soils assigned to wind group 1 are the most susceptible to wind erosion, soils assigned to wind group 8 are the least susceptible. Overall, the soils on site can be classified as moderately erodible. Please refer to Appendix D for the on-site soil information from the NRCS Soil Survey of Larimer County. The City of Fort Collins has mapped a floodplain associated with McClelland s Channel which is located on the southern most portion of the site. There is no work proposed within the limits of the McClelland floodplain. The outlet to the water quality pond is tying into an existing storm system that discharges into the channel. The anticipated sequence of construction shall progress as follows: 1) Installation of perimeter erosion control measures (other measures as required for the permit will be constructed throughout) including silt fence along the western property line and the top of bank of McClelland s Channel, existing inlet protection along County Fair Lane and Ziegler Road, and the vehicle tracking control pad at Ziegler Road. 2) Clearing, stripping and grading 3

7 3) Rough grading of water quality pond to be used as a temporary sediment trap 4) Utility installation 5) Sub-grade preparation for the roadway extension, drives and parking 6) Curb, gutter and sidewalks 7) Paving 8) Building construction (this may occur simultaneously with items 5 through 7) 9) Final grading and landscaping. All disturbed ground will be impervious (concrete, asphalt, or building), seeded and mulched, sodded or xeriscaped to permanently stabilize the site. The 10-year runoff coefficient associated with this project will be No known sources of pollution currently exist on this site. Potential pollutant sources brought onto the site during construction will be discussed (along with spill prevention) in Section 3.2 below. The anticipated non-stormwater components of discharge with this project are landscape irrigation return flows. The ultimate receiving water for this area is McClelland s Channel. 4

8 3. BMPS FOR STORMWATER POLLUTION PREVENTION 3.1. Erosion and Sediment Controls Structural Practices: Structural practices for the site will consist mainly of silt fence, vehicle tracking control pad, concrete washout area, inlet protection and wattles which are described in detail in the following paragraphs. Detail drawings of these BMPs are also included in Appendix A. These BMPs are expected to change as the construction progresses and it is the responsibility of the contractor to ensure appropriate BMPs are in place and/or removed at the appropriate time in the construction sequence. All temporary and permanent erosion and sediment control practices must be maintained and repaired as needed to assure continued performance of their intended function. All BMPs shall be inspected and repaired or replaced as indicated in Section 6 and as required to satisfy the conditions of the Permit. Silt fence is intended to filter sediment and contaminants from non-point runoff leaving the site. Perimeter silt fence shall be in place prior to commencement of any construction activity. During clearing and grubbing necessary for perimeter silt fence installation, all cleared material shall be placed on the uphill side of the trench so that if erosion occurs from the cleared material, the sediment will be trapped in the exposed trench and not transported downstream. Vehicle tracking control pad is intended to trap mud and sediment within coarse grain material and provide clean access to public roadways. Wherever construction vehicle access routes intersect paved public roads a vehicle tracking control pad shall be installed to minimize the transport of sediment (mud) by runoff or vehicles tracking onto the paved surface. Pads shall be maintained and refurbished when necessary to obtain their intended result. Concrete washout area is intended to contain washout liquids and solids that result from the cleaning of concrete trucks and pumps. Washouts should be placed near the area where the concrete is being poured. Inlet protection prevents sediment from entering storm drainage systems prior to permanent stabilization of the disturbed site area via ponding and settling of sediment. Inlet protections shall be placed at new inlets and existing inlets near the site. Storm sewer inlet protection must be inspected and maintained after every rainfall event that 5

9 produces runoff. Sediment must be removed and rocks replaced. Wattles are intended to filter concentrated runoff of sediment before entering drainage facilities. Wattles shall be implemented as gutter sediment control where necessary and as inlet protection. Wattle dikes shall be installed in swales. Wattles shall be installed immediately upon completion of over-lot grading and/or the installation of the proposed storm sewer inlets. Non-Structural Practices: All low sloped areas exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened condition by ripping or disking along land contours until mulch, vegetation or other permanent erosion control is installed. All exposed steep sloped areas exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall have slope protection. The contractor shall use a "tracked" vehicle, run perpendicular to slope to inhibit rill/gully erosion; the contractor may use other windrow-type methods as necessary. No soil shall remain exposed by land disturbing activity for more than thirty (30) days before required temporary or permanent erosion control (seed/mulch, landscaping, etc.) is installed. THE CONTRACTOR SHALL ADD ANY AND ALL BMP S AND DETAILS NEEDED FOR SEDIMENT/EROSION CONTROL. 6

10 3.2 Materials Handling and Spill Prevention Potential impacts from significant materials and their handling are as follows: Chemicals, cleaning substances, and petroleum products related to the construction will be stored within the construction trailer or storage shed where it will not be in contact with precipitation. No storage of these materials will be allowed outside. Fueling and maintenance of equipment shall take place at the construction staging area. Fueling will be accomplished with fueling trucks on an as needed basis. Absorbent (kitty litter) will be in the construction trailer and applied on any spill immediately and the dry material disposed of properly and legally. All construction waste shall be disposed of in the available dumpsters throughout the workday. Liquid wastes will be hauled off site and disposed of properly and legally. Any cleaning or maintenance of small equipment will be required to be done within a containment device (horse trough or small kiddy pool ) and the liquid disposed of properly and legally. In the event of any spill, the SWMP Administrator shall be immediately notified. Spills can be broken into three categories. Their definitions and the procedures required to address the spills are as follow: Minor Spill A spill generally of less than 5 gallons which is unlikely to reach adjacent waters (i.e. equipment leak). Procedure: a. Stop the source of the spill. b. Contain the spillage. c. Contact the SWMP Administrator. d. Clean up the spill with on-site absorbent material (kitty litter) e. Dispose of the dry material properly or legally. f. Document the spill and the response in the SWMP including dates and times verify that the pollutants are completely cleaned up. g. Include incident in the following training meeting. h. Provide information to the City of Fort Collins at the next regular inspection. 7

11 Significant Spill A spill of pollutants or oils of any size that will likely or has reached adjacent waters, may endanger health or the environment, or which may exceed a water quality standard. Procedure: a. Stop the source of the spill. b. Contain the spillage. c. Contact the SWMP Administrator. d. Clean up the spill with on-site absorbent material (kitty litter) e. Dispose of the dry material properly or legally. f. Document the spill and the response in the SWMP verify that the pollutants are completely cleaned up. g. Notify the City of Fort Collins (970) and the Colorado Department of Public Health and Environment spill reporting line (877) of the spill. h. Notify the same two entities above with a written submission (outlined within the permit) within 5 calendar days. i. Include incident in the following training meeting. Hazardous Spill A spill of a dangerous substance requiring expert cleanup. Procedure: a. Secure the area do not approach the spill. b. Offer first aid to any injured parties. c. Call 911 and describe the nature of the spill and any injuries. d. If possible, isolate downstream areas from the spill (for example, cover an inlet that is downstream and a safe distance from the spill with plastic and soil). e. Contact the SWMP Administrator. f. Document the spill and the response in the SWMP g. Notify the City of Fort Collins (970) and the Colorado Department of Public Health and Environment spill reporting line (877) of the spill. h. Notify the same two entities above with a written submission (outlined within the permit) within 5 calendar days. i. Include incident in the following training meeting. 8

12 4. STORMWATER MANAGEMENT CONTROLS 4.1. SWMP Administrator The Local Contact and SWMP Administrator is (INSERT CONTACT NAME, POSITION, COMPANY, AND PHONE NUMBER). (INSERT CONTACT) will be responsible for developing, implementing, maintaining, and revising the SWMP. (INSERT CONTACT) will also be responsible for required inspections and coordinating and documenting changes or repairs resulting from inspections. (INSERT CONTACT) will be responsible for the training and enforcement aspects of the SWMP and he is the first point of contact for any stormwater issues Identification of Potential Pollution Sources The permit identifies 13 potential sources that must be evaluated for their potential to contribute pollutants to stormwater discharge. These items have been evaluated below for this project: 1) Disturbed and stored soil YES The construction will require that areas be disturbed exposing soil including foundation construction, paving and repaving, slope construction, and demolition required as shown on the plans. BMPs will include silt fence on the downhill side of disturbed slopes, inlet protection on existing and proposed inlets, minimizing disturbance of existing vegetation and hard surfaces, and slope roughening and tracking of slopes after disturbance and prior to landscaping, paving, or building will be implemented. 2) Vehicle tracking of sediment YES The construction will require that subgrade be prepared for pavement and that vehicles drive on unpaved surfaces to the proposed buildings and utility improvement locations. BMPs will include a policy that vehicles be clean prior to entering the site and, if they become muddy during construction or earthwork activities, mud is removed by hand from the vehicle prior to departing the site in an area near the vehicle tracking pad. Any soil that is removed is to be disposed of in the trash dumpster by scraping or sweeping. Any muddy vehicle will use the vehicle tracking pad prior to leaving the site. 3) Management of contaminated soil NO Soil borings do not indicate any existing contamination. 4) Loading and unloading operations YES Chemicals and petroleum products will be brought to the site. Anytime these are being transported, they will be in a sealed container. 5) Outdoor storage activities YES Inert materials such as wood and stone will be stored outside and will likely be covered with tarps or plastic, but 9

13 are not pollutant sources and are not covered by the permit. Chemicals and petroleum products will be stored within the construction trailer or storage shed. Cement and mortar bags (if not contained in a vehicle or storage shed) will be completely covered with plastic to avoid contact with precipitation. 6) Vehicle and equipment maintenance and fueling YES Vehicle maintenance and fueling will take place in the northern half of the site adjacent to Ziegler Road (a minimum of 50 away from the proposed inlets in County Fair Lane) No fuel will be stored on site; a fuel truck will deliver fuel directly to equipment as needed. The largest risk to stormwater with this operation is pollutants being spilled in the existing asphalt. Absorbent (kitty litter) will be available on site and applied on any spill immediately and the dry material disposed of properly and legally. 7) Significant dust or particulate generating processes NO The area of heavy construction is very limited and none of the operations are expected to generate significant dust. 8) Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc. YES Fertilizers and pesticides will not be used. Any cleaning or maintenance of small equipment will be required to be done within a containment device (horse trough or small kiddy pool and the liquid disposed of properly and legally. 9) On-site waste management YES The multi-family building and site construction (access drive, parking, concrete walks, underground utilities) will result in construction waste. A dumpster for trash and a dumpster for bulk recycling will be on the site. Waste will be hauled to the dumpsters by hand or in loaders. Dumpsters will be hauled off as needed. Dumpsters shall be located a minimum of 50 feet away from the proposed inlets in County Fair Lane, the proposed water quality pond, and the existing inlet along Ziegler Road. No construction waste will be left outside overnight. No construction debris (including broken concrete) may be buried on the site. 10) Concrete truck/equipment washing YES A concrete washout will be provided on site. This will be used for trucks and for any masonry / concrete tools. The concrete washout shall be located a minimum of 50 feet away from the proposed inlets in County Fair Lane, the proposed water quality pond, and the existing inlet along Ziegler Road. 11) Dedicated asphalt of concrete batch plants NO None on this project. 12) Non-structural waste sources such as worker trash and portable toilets YES Trash dumpster will be available for worker s trash and will be located near the construction trailer. Portable toilets will be on site near the construction trailer. All portable toilets and trash dumpsters shall be located a minimum of 50 feet away from the proposed inlets in County Fair Lane, the proposed water quality pond, and the existing inlet along 10

14 Ziegler Road. 13) Other areas where potential spills can occur NO The above 12 items are adequate for the anticipated construction process. CONTRACTOR TO UPDATED THE ABOVE INFORMATION WITH EXACT LOCATIONS OF THE CONSTRUCTION TRAILER, VEHICLE TRACKING PAD, CONCRETE WASHOUT, DUMPSTERS, AND PORTABLE TOILETS PRIOR TO COMMENCEMENT OF CONSTRUCTION AND UPDATED AS NECESSARY THROUGHOUT THE CONSTRUCTION SEQUENCE. 5. FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT Long-term erosion control for this site will be the established vegetative cover, landscaping and xeriscaping along with the completed site improvements (pavement and buildings). Final stabilization shall be considered achieved once all proposed site improvements are in place and all vegetation is established. Vegetation shall not be considered established until a ground cover is achieved which is demonstrated to be mature enough to control soil erosion (typically 70% of the original vegetative cover). Areas controlled by grass sod will be considered established upon the completion of the sod installation. 11

15 6. INSPECTION AND MAINTENANCE Site inspections will be performed to effectively address maintenance, repair, and adequacy of BMPs. The site inspections will be performed by the SWMP Administrator or his designee a minimum of once every fourteen (14) calendar days on active construction sites and within 24 hours after a significant storm event (event causing erosion). As part of the site inspections the inspector will keep documentation of all inspections and BMP maintenance, including updated Site Maps indicating new BMPs or the removal of BMPs since the previous inspection. Blank Site Maps will be utilized and will be redlined by the SWMP Administrator throughout construction to note all BMPs, pollutant sources, storage locations, etc. Any maintenance, repair, or necessary installation of BMPs that are noted during the inspection must begin immediately. The modifications shall be noted in the SWMP and the action taken as a result of the inspection shall be noted and certified on or attached to the original inspection report (date and time that the repair or change was started and finished and a certification that it was done properly) City of Fort Collins Standard Erosion and Sediment Control Notes 1) The City Stormwater Department erosion control inspector must be notified at least 24 hours prior to any construction on this site. 2) All required BMPs shall be installed prior to any land disturbing activity (stockpiling, stripping, grading, etc.). All of their required erosion control measures shall be installed at the appropriate time in the construction sequence as indicated in the approved project schedule, construction plans, and erosion control report. 3) Pre-disturbance vegetation shall be protected and retained wherever possible. Removal or disturbance of existing vegetation shall be limited to the area required for immediate construction operations, and for the shortest practical period of time. 4) All soils exposed during land disturbing activity (stripping, grading, utility installations, stockpiling, filling, etc.) shall be kept in a roughened condition by ripping or disking along land contours until mulch, vegetation, or other permanent 12

16 erosion control is installed. No soils in areas outside project street rights of way shall remain exposed by land disturbing activity for more than thirty (30) days before required temporary or permanent erosion control (e.g. seed/mulch, landscaping, etc.) is installed, unless otherwise approved by the Stormwater Department. 5) The property must be watered and maintained at all times during construction activities so as to prevent wind-caused erosion. All land disturbing activities shall be immediately discontinued when fugitive dust impacts adjacent properties, as determined by the City Engineering Department. 6) All temporary (structural) erosion control measures must be inspected and repaired or reconstructed as necessary after each runoff event and every 14 days in order to assure continued performance of their intended function. All retained sediments, particularly those on paved roadway surfaces, shall be removed and disposed of in a manner and location so as not to cause their release into any drainage way. 7) No stockpile shall exceed ten (10) feet in height. All soil stockpiles shall be protected from sediment transport by surface roughening, watering, and perimeter silt fencing. Any soil stockpile remaining after 30 days shall be seeded and mulched. 8) City Ordinance prohibits the tracking, dropping, or depositing of soils or any other material onto city streets by or from any vehicle. Any inadvertent deposited material shall be cleaned immediately by the contractor. 13

17 6.2. City of Fort Collins Erosion Control Security Calculations The cost of erosion control for the site was compared to the cost to reseed the entire site and the greater cost was used to establish the erosion control escrow amount. The cost to reseed the site is estimated at $4, Using a multiplier of 1.5 the erosion control escrow amount would be $6, The site erosion control cost is estimated at $5, Using a multiplier of 1.5 the erosion control escrow amount would be $8, The larger sum of the Erosion Control cost and the Reseeding cost shall be used for the escrow account. Therefore, the Erosion Control Escrow amount is $8, See Table 6.1 for a break-down of the costs associated with seeding and erosion control. Table 6.1: Erosion Control Cost Estimate ITEM QUANTITY UNIT COST/UNIT TOTAL COST Silt Fence 932 LF $ 2.00 $ Wattle 20 LF $ 7.00 $ Inlet Protection (IP) 7 EA $ $ Concrete Washout 1 EA $ $ Construction Entrance 1 EA $ 1, $ 1, Sedimentation Basin 2 EA $ $ CITY RESEEDING COST Subtotal $ 5, Contingency (50%) $ 2, Total $ 8, Reseed/Mulch 2.71 ACRE $ 1, $ 4, Subtotal $ 4, Contingency (50%) $ 2, Total $ 6, CALCULATED EROSION CONTROL ESCROW AMOUNT $8, Note: Minimum Escrow Amount is $3,000 14

18 7. SWMP IMPLIMENTATION It is the responsibility of the contractor to operate and maintain all facilities and systems of treatment and control which are installed to achieve compliance with the conditions of the permit. This includes effective performance, adequate funding, adequate staffing and training, etc. (see permit). All personnel on the construction site who will be in a position to affect or be affected by the SWMP shall be trained prior to beginning work. These individuals will be given general orientation information regarding the project and SWMP, shown where the SWMP is physically located, the SWMP will be explained to them and available for their review, and the enforcement policy will be reviewed. After this training, a certification that the employee or subcontractor s employee is familiar with the document and its procedures will be signed. Copies of these certifications shall be included in the SWMP notebook Appendix. Throughout the construction, as a part of a weekly safety meeting, the SWMP will be reviewed with all attendees and any incidents discussed. All attendees shall be logged. 15

19 APPENDIX A BMP DETAILS

20

21

22 APPENDIX B EROSION CONTROL PLAN AND SITE MAP Q

23

24 APPENDIX C CONSTRUCTION SEQUENCE R

25 Construction Sequence Chart Location: Ziegler Mixed Use - Lot 2 Date: Septemeber 2014 (Construction Phases) Best Management Practices (BMPs) Structural "Installation" Silt Fence Barriers* Contour Furrows (Ripping / Disking) Sediment Trap / Filter **Vehicle Tracking Pad* Concrete Washout* Flow Barriers (Wattles)* Stream Flow Diversion* Rip Rap *All BMPs to be Removed once Construction is Complete. Mobilization Clear, Strip, Grade Utility Installation Subgrade Curb, Gutter and Sidewalk Paving Building Construction Landscape Demobilization **BMPs installed and maintained by others Vegetative Temporary Seeding Planting Mulching/Sealant Permanent Seeding Planting Rolled Products : Netting/Blankets/Mats Other: Any time the site will sit dorment longer than 30 Days. Any time the site will sit dorment longer than 30 Days. Any time the site will sit dorment longer than 30 Days.

26 APPENDIX D SOIL INFORMATION S

27 105 1' 17'' W Soil Map Larimer County Area, Colorado (Ziegler Mixed Use) 105 1' 9'' W ' 47'' N 40 30' 47'' N 40 30' 39'' N ' 39'' N ' 17'' W N Map Scale: 1:1,260 if printed on A portrait (8.5" x 11") sheet. Meters Feet Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS ' 9'' W Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 1 of 3

28 Soil Map Larimer County Area, Colorado (Ziegler Mixed Use) 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 8, Dec 23, 2013 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 22, 2011 Nov 18, 2011 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. Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 2 of 3

29 Soil Map Larimer County Area, Colorado Ziegler Mixed Use Map Unit Legend Larimer County Area, Colorado (CO644) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 74 Nunn clay loam, 1 to 3 percent slopes 76 Nunn clay loam, wet, 1 to 3 percent slopes 103 Stoneham loam, 5 to 9 percent slopes % % % Totals for Area of Interest % Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 3 of 3

30 105 1' 17'' W Hydrologic Soil Group Larimer County Area, Colorado (Ziegler Mixed Use) 105 1' 9'' W ' 47'' N 40 30' 47'' N 40 30' 39'' N ' 39'' N ' 17'' W N Map Scale: 1:1,260 if printed on A portrait (8.5" x 11") sheet. Meters Feet Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS ' 9'' W Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 1 of 4

31 Hydrologic Soil Group Larimer County Area, Colorado (Ziegler Mixed Use) 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 of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 8, Dec 23, 2013 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 22, 2011 Nov 18, 2011 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. Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 2 of 4

32 Hydrologic Soil Group Larimer County Area, Colorado Ziegler Mixed Use 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 74 Nunn clay loam, 1 to 3 percent slopes 76 Nunn clay loam, wet, 1 to 3 percent slopes 103 Stoneham loam, 5 to 9 percent slopes C % C % B % Totals for Area of Interest % 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. Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 3 of 4

33 Hydrologic Soil Group Larimer County Area, Colorado Ziegler Mixed Use Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 4 of 4

34 105 1' 17'' W K Factor, Whole Soil Larimer County Area, Colorado (Ziegler Mixed Use) 105 1' 9'' W ' 47'' N 40 30' 47'' N 40 30' 39'' N ' 39'' N ' 17'' W N Map Scale: 1:1,260 if printed on A portrait (8.5" x 11") sheet. Meters Feet Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS ' 9'' W Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 1 of 3

35 K Factor, Whole Soil Larimer County Area, Colorado (Ziegler Mixed Use) MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons Not rated or not available Soil Rating Lines Not rated or not available Soil Rating Points 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 of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 8, Dec 23, 2013 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: 18, 2011 Apr 22, 2011 Nov 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. Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 2 of 3

36 K Factor, Whole Soil Larimer County Area, Colorado Ziegler Mixed Use K Factor, Whole Soil K Factor, Whole Soil Summary by Map Unit Larimer County Area, Colorado (CO644) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 74 Nunn clay loam, 1 to 3 percent slopes 76 Nunn clay loam, wet, 1 to 3 percent slopes 103 Stoneham loam, 5 to 9 percent slopes % % % Totals for Area of Interest % Description 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 saturated hydraulic conductivity (Ksat). Values of K range from 0.02 to Other factors being equal, the higher the value, the more susceptible the soil is to sheet and rill erosion by water. "Erosion factor Kw (whole soil)" indicates the erodibility of the whole soil. The estimates are modified by the presence of rock fragments. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 3 of 3

37 105 1' 17'' W Wind Erodibility Group Larimer County Area, Colorado (Ziegler Mixed Use) 105 1' 9'' W ' 47'' N 40 30' 47'' N 40 30' 39'' N ' 39'' N ' 17'' W N Map Scale: 1:1,260 if printed on A portrait (8.5" x 11") sheet. Meters Feet Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS ' 9'' W Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 1 of 3

38 Wind Erodibility Group Larimer County Area, Colorado (Ziegler Mixed Use) MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons L Not rated or not available Soil Rating Lines L Not rated or not available Soil Rating Points L 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 of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 8, Dec 23, 2013 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 22, 2011 Nov 18, 2011 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. Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 2 of 3

39 Wind Erodibility Group Larimer County Area, Colorado Ziegler Mixed Use Wind Erodibility Group Wind Erodibility Group Summary by Map Unit Larimer County Area, Colorado (CO644) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 74 Nunn clay loam, 1 to 3 percent slopes 76 Nunn clay loam, wet, 1 to 3 percent slopes 103 Stoneham loam, 5 to 9 percent slopes % % % Totals for Area of Interest % Description A wind erodibility group (WEG) consists 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. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Lower Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 8/21/2014 Page 3 of 3