HomeMy WebLinkAboutBOHLENDER FUNERAL CHAPEL - FDP230011 - SUBMITTAL DOCUMENTS - ROUND 3 - DRAINAGE REPORT
July 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 the approved Final and Drainage and Erosion Control Report
for Value Plastics Dated March 2, 1995, along with any amendments and associated
letters for this subdivision and should not replace any portion of such documents.
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 with a
100-year flow rate of 0.45 cfs 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 and flow to the north. Flow is captured
by inlets and enters the public storm drain system with outfall to the Poudre River.
Refer to attached Grading and Drainage Plan for Value Plastics from 1995 and 2016
for additional information on existing drainage patterns and release rate. The attached
plans are pulled from the original Value plastics Drainage Report from March of 1995
by Water, Waste, & Land and the Drainage Compliance Letter from April 2016 by
Northern Engineering. Additionally, the Grading, Drainage, and Drives Plan for Value
Plastics PUD in 1984 is also attached for reference on the original design and
construction of the pond, outlet structure, and release pipe.
Proposed Alterations to Drainage
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 125 square feet and a total modified
impervious area of 977 square feet. 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. All
areas within the scope of these modifications are within the property and drain to the
detention pond. The existing detention pond and outlet structure will not be modified,
and the existing release rate will be maintained.
Comparison
The proposed improvements will result in a net increase in weighted imperviousness
for the site of 125 square feet and a total modified impervious area of 977 square feet.
Due to not exceeding the 1,000 square feet threshold for modified impervious area,
specific water quality measures are not being provided. 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.
New Weighted Impervious Area – 125 square feet.
Modified Impervious Area – 977 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.
I hereby attest that this report for the final drainage design for the Bohlender Funeral
Chapel was prepared by me or under my direct supervision, in accordance with the
provisions of the Fort Collins Stormwater Criteria Manual. I understand that the City of
Fort Collins does not and will not assume liability for drainage facilities designed by
others.
Sincerely,
Brian Campbell, PE
Director of Municipal Services
Enclosed:
Impervious area calculations
Runoff Reduction
Existing and Proposed Drainage Exhibits
Soils Report
Value Plastics Drainage and Grading Reference Plans
CG
CG
5/24/2023
Concrete (sf)Rooftop (sf)Lawn (sf)Total Disturbed Area (sf)Weighted Imp Area (sf)
Existing 852 0 2406 852
Proposed 612 406 2240 977
125
977
Project No:
Calculated By:
Check By:
Date:
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
Modified Impervious Area (sf)
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
M
CONTROL
IRRCONTROL
IRRUDUDUD
UDUDUD1
1.98 AC
3
2.28 AC
2
2.17 AC
Q100 = 0.45 CFS
DESIGN POINT A
DESIGN POINT B
EXISTING
BUILDING
EXISTING
BUILDING
EXISTING STORM
OUTLET PIPE
ORIGINAL
BASIN LINE
PROPOSED
BASIN LINE
EXISTING
AREA DRAIN
PROPOSED GRAVEL
PAVER PARKING LOT
PROPOSED GRASS PAVER
PARKING LOT S.TIMBERLINE ROADEASTBROOK DRIVEDANFIELD COURT No.Revisions:By:Date:REVIEWED BY:N. HawsDESIGNED BY:DRAWN BY:SCALE:DATE:4.1.16PROJECT:207-015Sheet
Of 9 SheetsVALUE PLASTICS - MINOR AMENDMENTDRAWING FILENAME: D: rojects\207-015\Dwg\Drng\207-015_DRNG.dwg LAYOUT NAME: DR1 DATE: Apr 04, 2016 - 7:09am CAD OPERATOR: CodyLIST OF XREFS: [207-015_xEXST] [NES-xborder] [207-015_xPgrad] [207-015_xPutil] [207-015_xTOPO]ENGINEERNGIEHTRONRN301 North Howes Street, Suite 100Fort Collins, Colorado 80521www.northernengineering.comPhone: 970.221.41583325 S. TIMBERLINE ROAD04.01.16
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU DIG, GRADE, OR
EXCAVATE FOR THE MARKING OF UNDERGROUND MEMBER
UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what's below.
before you dig.Call
R
LEGEND:
4953
PROPOSED CONTOUR 93
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTERPROPERTY BOUNDARY
PROPOSED INLET
ADESIGN POINT
FLOW ARROW
DRAINAGE BASIN LABEL
BASIN
DESIGNATION
BASIN
AREA (AC)
DRAINAGE BASIN BOUNDARY
PROPOSED SWALE SECTION
11
B2
1.45 AC
NORTH
( IN FEET )
0
1 INCH = 40 FEET
40 40 80 120
DR1 DRAINAGE PLANC. SnowdenL. Seeber1"=40'FOR DRAINAGE REVIEW ONLY
NOT FOR CONSTRUCTION
NOTES:
Date
Date
Date
Date
Date
DateAPPROVED:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
CHECKED BY:
City Engineer
Water & Wastewater Utility
Stormwater Utility
Parks & Recreation
Traffic Engineer
Environmental Planner
City of Fort Collins, Colorado
UTILITY PLAN APPROVAL