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Home My WebLink AboutBOHLENDER FUNERAL CHAPEL - FDP230011 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT April 12, 2023 RE: Drainage letter for the proposed Bohlender Funeral Home at 3350 Eastbrook Dr. in Fort Collins, CO. To Whom It May Concern, The purpose of this letter is to serve as drainage compliance for the proposed landscape modifications and exterior improvements and show that the drainage will not be altered significantly from the existing condition. This drainage letter should be used in conjunction with any existing approved drainage report from the original development and should not replace any portion of such reports. Location The proposed construction will take place within the existing development at 3350 Eastbrook Dr., a part of Lot 3 of the New Hampshire Subdivision, situated in the Southeast ¼ of Section 30, Township 7 North, Range 68 West of the Sixth P.M., City of Fort Collins, County of Larimer, State of Colorado. The site is located within Foothills major drainage basin per the Fort Collins Stormwater Master Plan. Existing Drainage Conditions Runoff generally flows from southwest to northeast where it is detained within the pond area and parking lot. An outlet structure releases flows to the northeast and a landscaped berm serves as an emergency overflow path. Flows released from the site drain to the northeast where they are accommodated by the adjacent development. Existing drainage reports for the site and neighboring sites are unavailable and it is assumed that flow is captured by inlets and enters the public storm drain system with outfall to the Poudre River. Proposed Alterations to Drainage and Water Quality This project includes the removal and replacement or modification of existing landscaping and hardscaping features on site. The proposed changes will result in a net increase in the weighted impervious area of 574 square feet and a total modified impervious area of 1,151 square feet. A portion of the sidewalk is being replaced and is considered as a maintenance item and is therefore excluded from the net new and modified impervious area totals. The proposed and modified impervious areas are designed to route runoff over grass buffer areas to avoid directly connected impervious areas and provide water quality treatment by promoting infiltration. Calculations were performed using Mile High Flood District BMP Workbook for runoff reduction calculations. The individual areas are smaller than the recommended area for runoff reduction calculations, so the disturbed areas were analyzed as a whole. The provided grass buffers are sufficient to reduce 100% of the estimated water quality volume that would be needed if a traditional BMP was used. See attached Runoff Reduction Exhibit for reference. All areas within the scope of these modifications are within the property and drain to the detention pond. Comparison The proposed improvements will result in a net increase in weighted imperviousness for the site of 574 square feet and a total modified impervious area of 1,151 square feet. Due to the slight exceedance of 1,000 square feet for modified impervious and water quality being provided, a variance for alternative compliance is requested. Existing drainage patterns will not be altered or affected by the proposed landscape changes. Due to the minimal increase in impervious area, there are no anticipated adverse impacts to the downstream properties and drainage infrastructure. Total Disturbed Area – 3,258 square feet Existing Weighted Impervious area within disturbed area – 852 square feet. Proposed Impervious area within disturbed area – 1,426 square feet. New Weighted Impervious Area – 574 square feet. Modified Impervious Area – 1,151 square feet. Conclusions Due an increase in weighted imperviousness area of less than 1000 square feet and preservation of existing drainage patterns, the proposed improvements will not significantly alter the drainage characteristics from the existing conditions or have any adverse impact on the downstream stormwater system. Should you have any questions or comments, or need any further information, do not hesitate to contact me. Sincerely, Brian Campbell, PE Director of Municipal Services Enclosed: Impervious area calculations Runoff Reduction Existing and Proposed Drainage Exhibits Soils Report CG BC 4/12/2023 Concrete (sf)Rooftop (sf)Lawn (sf)Total Disturbed Area (sf)Weighted Imp Area (sf) Existing 852 0 2406 852 Proposed 1061 406 1791 1426 574 1426 275 1151 IMPERVIOUSNESS CALCULATIONS Bohlender Funeral Home * Percent Impervious Values Calculated using Table 4.1-3 from Fort Collins Stormwater Criteria Manual, Chapter 5. Net New Impervious Area (sf) 3258 CO14520 - Fort Collins, CO Sidewalk Maintenance (sf) Modified Impervious Area (sf) Proposed Impervious Area (sf) Project No: Calculated By: Check By: Date: EX C E P T I O N 1 3 N 6163 East County Road 16Loveland, CO 80537p: 970.613.1447www.tait.comSanta AnaSan DiegoSacramentoRiversideDenverBoiseDallasAtlantaSince 1964ENGINEERING ENVIRONMENTAL BUILDING LANDASSOCIATES&RUNOFF REDUCTIONJOB NO: CO14520CHECKED: BC DATE: 04/12/2023DRAWN: CG DATE: 04/12/20241 OF 1BOHLENDER FUNERAL HOMENEENAN ARCHISTRUCTION3350 EASTBROOK DR.FORT COLLINS, CO R=15.00' L=23.60'Δ=90°09'12"CD=N44° 39' 53"W, 21.24'EXCEPTION 13SITEE. HORSETOOTH ROADDANFIELD CT.EASTBROOK DR. S. TIMBERLINE ROAD UNION PACIFIC RAILROAD VERMONT DR IVE CHECKED: DATE: DRAWN: REVISION #: DATE: JOB NO: DATE: BOHLENDER FUNERAL HOME 3350 EASTBROOK DR., FORT COLLINS, COCO14520 NEENAN ARCHISTRUCTIONKnow what'sbelowCallbefore you dig.R6163 East County Road 16 Loveland, CO 80537 p: 970.613.1447 www.tait.com Santa Ana San Diego Sacramento Riverside Denver Boise Dallas AtlantaSince 1964 ENGINEERING ENVIRONMENTAL BUILDING LANDASSOCIATES&NDRAINAGE EXHIBIT DRNCG 02/17/2023 BC 04/12/2023 N United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Larimer County Area, ColoradoNatural Resources Conservation Service April 11, 2023 18 Custom Soil Resource Report Map—Hydrologic Soil Group 448783044878404487850448786044878704487880448789044879004487910448783044878404487850448786044878704487880448789044879004487910496470 496480 496490 496500 496510 496520 496530 496540 496550 496560 496570 496580 496590 496600 496470 496480 496490 496500 496510 496520 496530 496540 496550 496560 496570 496580 496590 496600 40° 32' 30'' N 105° 2' 30'' W40° 32' 30'' N105° 2' 24'' W40° 32' 28'' N 105° 2' 30'' W40° 32' 28'' N 105° 2' 24'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 30 60 120 180 Feet 0 5 10 20 30 Meters Map Scale: 1:641 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. Table—Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 36 Fort Collins loam, 3 to 5 percent slopes C 1.7 93.3% 74 Nunn clay loam, 1 to 3 percent slopes C 0.1 6.7% Totals for Area of Interest 1.8 100.0% Rating Options—Hydrologic Soil Group Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Custom Soil Resource Report 20 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 21 United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf Custom Soil Resource Report 22