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Home My WebLink About3009 S TAFT HILL RD SINGLE FAMILY HOME - FDP190027 - SUBMITTAL DOCUMENTS - ROUND 3 - DRAINAGE REPORTLand Surveying • Land Development • Civil Engineering • Building Design & Development (720) 689‐7324 PO Box 441730 Aurora, CO 80044 October 27, 2019 Revised November 30, 2019 Revised May 4, 2020 Dustin Couture 3009 Taft Hill Rd. Fort Collins, CO 80526 RE: Drainage Summary for single family residence proposed to be constructed at 2120 Falcon Drive, in Fort Collins, Colorado. Mr. Couture, Per your request, Prism Design & Consulting Group has performed an analysis of anticipated stormwater runoff, comparing existing conditions to proposed conditions. The proposed development includes the construction of a new 4,470 square foot (SF) 1‐story single family residence with a 1,335 SF garage. A gravel driveway will be constructed to the new residence. To facilitate the new driveway, which will be generally in the footprint of the existing driveway, two existing outbuildings will be removed and potentially relocated to a new spot on the property. This drainage analysis assumes that the existing buildings will indeed be replaced in‐ kind. The total area of the property is approximately 181,800 SF (4.17 acres). Historically, the total weighted imperviousness is 4.8%, with a 5‐year storm runoff of 1.10 cubic feet per second (cfs), and a 100‐year storm runoff of 3.62 cfs. The proposed imperviousness is 9.1%, with a 5‐year storm runoff rate of 1.54 cfs, and a 100‐year storm runoff rate of 4.61 cfs. The Spring Creek Drainage Master Plan assumed no less than 30% impervious area for any developed area. In our opinion, increase in runoff from the proposed development will be within acceptable limits. This site does not lie within a designated flood plain, as observed on Map Number 08069C0986G, effective 5/2/2012. Please feel free to call if you have any questions. Sincerely, Brian Johnson, P.E. Prism Design & Consulting Group SF SF SM SILT FENCE SEEDING AND MULCHING / GENERAL LANDSCAPING KEY BMP EROSION CONTROL LEGEND NS SEEDING AND MULCHING / BUFFALO GRASS SEED MIX CONTOUR LEGEND EX. 1' INTERVAL CONTOURS 5100 EX. 5' INDEX CONTOURS PR. 1' INTERVAL CONTOURS 5100 PR. 5' INDEX CONTOURS X X X X X X X X X X X X X X X X UE UE UE UE UE SAN SAN SAN SAN SAN W W W W W SAN SAN W W > > > > > > > SF SF SF SF SF SF SF SF SF SF > > > > > > SF SILT FENCE 50' NATURAL HABITAT BUFFER EXISTING OUTBUILDINGS TO BE REMOVED 50' NATURAL HABITAT BUFFER EX. 30" CALIPER COTTONWOOD EXISTING FENCE ALONG R.O.W. LINE EXISTING OUTBUILDING TO POSSIBLY BE RELOCATED NEAR NORTH LOT LINE EXISTING CITY TREES IN PUBLIC RIGHT-OF-WAY NOT TO BE DISTURBED (SEE LANDSCAPE NOTES) 50' NATURAL HABITAT BUFFER PROPOSED RESIDENCE ONE STORY, RANCH STYLE TOP OF FOUNDATION: EL=5106.5 MAIN LEVEL: FFE =5107.7 GARAGE TOF=5106.5 FFE=5105.5 (DOOR) CONC. PATIO 5100 5101 5102 5103 5099 5098 5100 5104 COVERED FRONT PORCH Lift Station 51.7' 5105 5100 5104 5103 5103 5102 5101 DIRECTIONAL BORE NEW SERVICES TO THE UTILITY STUBS UNDER CANAL (incl. DRY UTIL's) Refer to Ditch Crossing Agreement FUTURE IRRIGATION WATER RETENTION AREA FOR EXISTING DEEDED SURFACE WATER RIGHTS. REFER TO NARRATIVE. 20ft SIDE SETBACK 30ft FRONT SETBACK ESTABLISH CLASS 6 ROADBASE AS NEEDED, per 40 TON REQUIREMENT AS PLATTED LOCATION, FROM TOP of BANK ANY DISTURBED AREAS SHALL BE RE-SEEDED WITH APPROVED NATIVE GRASSES per CODE FIRE FIGHTING ACCESS TO THIS REMOTE LOCATION OF THE HOME DOES NOT EXCEED 150ft. FROM PAVED ACCESS POINTS PLACE 50ft. LENGTH OF APPROVED TRACKING PAD MATERIAL AT ENTRANCE OF DRIVE DURING CONST. TOTAL AREA OF DISTURBANCE IS APPROXIMATELY 40,000 s.f. Shrubs Shrubs Grasses EXISTING CURB STOP EXISTING SAN. SEWER CONNECTION 4000 s.f. OF OFFSETTING MITIGATION ALONG WEST SIDE OF LOT TO COMPENSATE FOR IMPACTS TO EXISTING BUFFER AREA FROM DISTURBANCE TOTAL BUFFER ZONE=85,400s.f DISTURBANCE IMPACT=4,000s.f. MITIGATION OFFSET = 4,000s.f. AS PLATTED LOCATION, FROM TOP of BANK ANY DISTURBED AREAS SHALL BE RE-SEEDED WITH APPROVED NATIVE GRASSES per CODE AS PLATTED LOCATION, FROM TOP of BANK ANY DISTURBED AREAS SHALL BE RE-SEEDED WITH APPROVED NATIVE GRASSES per CODE SM SEEDING/MULCHING OR SOD 180'± to Property line 5105 5104 5103 5102 NATURAL HABITAT BUFFER ZONE THE NATURAL HABITAT BUFFER ZONE IS INTENDED TO BE MAINTAINED IN A NATIVE LANDSCAPE. PLEASE SEE SECTION 3.4.1 OF THE LAND USE CODE FOR ALLOWABLE USES WITHIN THE NATURAL HABITAT BUFFER ZONE. PR. GRD. EX. GRD. TIE INTO EXISTING GRADE NS NATIVE SEEDING w/ MULCH UE UE UE UE UE UE UE UE ELECTRIC SERVICE 24.4' 32.3' REV# DATE DESCRIPTION JOB NUMBER: SCALE: SHEET: DRAWN BY: PREPARED FOR: PROJECT LOCATION: REVISIONS ORIGINAL DATE: DESIGN BY: ORIGINAL DATE: SEAL AND SIGNATURE REQUIRED FOR OFFICIAL OR CONSTRUCTION DRAWINGS. THIS DRAWING MAY BE DUPLICATED FOR THE PURPOSE OF PROVIDING ADDITIONAL COPIES OF THE SAME DESIGN (SAME PROJECT) TO MULTIPLE PARTIES OR BY JURISDICTION FOR RECORDING, ETC. THIS DESIGN MAY NOT, HOWEVER, BE APPLIED TO OTHER SITES/PROPERTIES WITHOUT EXPRESS WRITTEN CONSENT OF OR THOROUGH REVIEW BY PRISM DESIGN & CONSULTING GROUP. THIS DESIGN MAY BE SUBMITTED TO JURISDICTION FOR REVIEW/PERMIT WITHIN 1 YEAR FROM THE DATE OF THE SEAL/SIGNATURE. AFTER THIS TIME, PRISM DESIGN & CONSULTING GROUP RESERVES THE RIGHT TO REVIEW THE PLANS TO CONFIRM THEY ARE IN COMPLIANCE WITH CURRENT REGULATIONS/CRITERIA. DESIGN & CONSULTING GROUP P.O. BOX 441730 phone: 720-689-7324 AURORA, CO. 80044 web: PrismDCG.COM LANDSCAPING & SITE PLAN PRISM 19-024 LOT 2 of COUTURE SUBDIVISION DUSTIN COUTURE - OWNER 315 S. IMPALA DRIVE FORT COLLINS, CO 80521 AS SHOWN GLR 2 2 FALCON DRIVE and TAFT HILL ROAD FORT COLLINS, COLORADO 10/27/19 BWJ/GLR 10/27/2019 C1.1 SITE BENCHMARK : RIM OF SAN. SEWER MANHOLE AS DEPICTED. El=5106.60 NAVD29 SITE PLAN COUTURE RESIDENCE Lot 2, Couture Subdivision NE1/4 of Section 28, T.7N., R.69W., 6th P.M. Ft. COLLINS, COLORADO SCALE: 1" = 30' 31692 6/23/20 Tree Inventory and Mitigation Information: 3009 S Taft Hill Road # Species DBH Condition Mitigation Notes 1 Siberian Elm (Ulmus pumila) 25 Fair minus 2 OUTSIDE LOD-RETAIN 2 Siberian Elm (Ulmus pumila) 18 Poor 1.5 TO BE REMOVED 3 Siberian Elm (Ulmus pumila) 13 Fair 1 TO BE REMOVED 4 Cottonwood (Populus sargentii) 32 Fair Plus 3 RETAIN 5 Cottonwood (Populus sargentii) 18 Fair 2 RETAIN 6 Bur oak (Quercus macrocarpa) 7 Fair 1 STREET TREE - RETAIN 7 Bur oak (Quercus macrocarpa) 8 Fair plus 1 STREET TREE - RETAIN 8 Texas Red Oak (Quercus buckleyi) 5 Fair plus 1 STREET TREE - RETAIN 9 Texas Red Oak (Quercus buckleyi) 5 Fair 1 STREET TREE - RETAIN 10 Texas Red Oak (Quercus buckleyi) 7 Fair 1 STREET TREE - RETAIN 11 Northern Catalpa (Catalpa speciosa) 7 Fair 1 STREET TREE - RETAIN 12 Bur oak (Quercus macrocarpa) 8 Fair plus 1 STREET TREE - RETAIN 13 Bur oak (Quercus macrocarpa) 7 Fair 1 STREET TREE - RETAIN REQ MITIGATION: 3 TREES (2.5 ROUNDED UP) Mitigation Trees M14 Ponderosa Pine (Pinus ponderosa) 8' tall M15 Cottonwood (Populus sargentii) 2" M16 Ponderosa Pine (Pinus ponderosa) 8' tall Shrubs 17, 18, 19 Red Elderberry (Sambucus microbotrys) #5 GAL 20-25 Sand Cherry (Cerasus pumila) #5 GAL 26, 27, 28 Mountain Ninebark (physocarpis monogynus) #5 GAL R1 5/2/20 PER CITY COMMENTS LETTER, DATED 1/10/2020 LANDSCAPE NOTES: - PROPOSED LANDSCAPING IS AS DIRECTED BY OWNER. - SEED MIX: * BUFFALOGRASS (100%) * 13-15 PLS/ACRE FOR DRILL-SEED APPLICATION, DOUBLE FOR BROADCAST APPLICATION. - REQUIRED TREE SIZES AND METHOD OF TRANSPLANT: * CANOPY SHADE TREE: 2.0" CALIPER BALLED AND BURLAPPED * EVERGREEN TREE: 8.0' HEIGHT BALLED AND BURLAPPED * ORNAMENTAL TREE: 2.0" CALIPER BALLED AND BURLAPPED TREE MITIGATION NOTE: TREE MITIGATION REQUIREMENTS AS REQUIRED BY 3.2.1(F), TREE PRESERVATION AND MITIGATION, SHALL NOT APPLY TO THE BOUNDARY OF THE PLEASANT VALLEY LAKE AND CANAL COMPANY'S EASEMENT AND SHALL BE EXCLUDED FROM THE LIMITS OF DEVELOPMENT DUE TO THE EXCLUSIVE RIGHT OF THE DITCH COMPANY TO OPERATE, MAINTAIN, ALTER, ENLARGE RELOCATE, CLEAN, AND MANAGE THE DITCH. THE CITY OF FORT COLLINS LAND USE CODE EXPRESSLY EXCLUDES THE USE OF LAND FOR THE PURPOSE OF DELIVERING WATER BY DITCH OR CANAL FROM THE DEFINITION OF DEVELOPMENT, PROVIDED THAT IT DOES NOT CREATE A NUISANCE. R2 6/23/20 PER CITY COMMENTS LETTER, DATED 6/5/2020