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HomeMy WebLinkAboutSite Certifications - 12/11/2015North Star �` design 700 Automation Drive, Unit I Windsor, CO 80550 Phone: 970-686-6939 Fax: 970-686-1188 November 6, 2015 Wes Lemarque City of Fort Collins 700 Wood Street Fort Collins, CO Re: Feeders Supply Record Drawings Mr. Lemarque: City of Ft. Collin roved Plans Approved By Date 1Z-II-16 s ;2-u-ice wu- This letter is to serve as an overall site certification for the Feeder Supply site improvements and the multi -story residential building. The restaurant building improvements and expansions are not included in this certification. All information provided in this letter and on the record drawing plans you have received is based on a several field surveys completed by Washburn Land Surveying on August 12, September 22 and October 19, 2015. The LID swale on the northwest side of the building was constructed within construction tolerances of the design plans elevations and will function as intended. Photos of the construction of the LID swale are included at the end of this letter. All storm on site is private and elevations were verified with the Washburn surveys. The permeable pavers were installed on site and photos of the installation process are also provided at the end of this letter. The finished floor elevations of the lowest floor of the building along Willow were constructed at or within 0.05' of the design elevation. The garage elevations and all curb and gutter (private) on site were constructed within acceptable construction tolerances. The south portion of the driveway (nearest Linden) has not been constructed and will be completed with the restaurant expansion. All of the private drive that is required for emergency access has been constructed. There appears to be (based on the field survey) sufficient slope away from the building to allow runoff to adequately flow in the direction as intended by the original design plans. If you have and questions,or need additional information for this certification, please call me. Sincerely, Patricia Kroetch, P.E. I i;_III e 1 LI ID Shale: I.%c:n ation Figure 2 I.ID Swale: Subdrain Installation No Text Figure 5 LID Swale: Inflow Pipe Installation Fi--urc 6 LID Shale: \'iee from Willmc Figure 7 LID Swale: View from Private Drive Figure 9: Subgrade Preparation for Pacers Figure 10: Liner & Drainage Course Installation for Pavers i;!ure 12: Completed Drainage Couece Figure 13: Leveling Course Installation Figure 13: Payer Installation Fort��ins COMMERCIAL, MULTI -FAMILY AND SUBDIVISION CERTIFICATION FORM & CHECKLIST (Overall Site Drainage) Feeders Supply - (Project Name) 11/6/15 (Date) (For Commercial or Multi -family, please list any applicable building permit numbers) Please fill in all applicable items in this Certification Form for Commercial, Multi -Family and Overall Single Family sites. A copy of the approved grading plan must be submitted with the as -built grading plan. (It is preferred to have the as -built elevations written in red next to the approved elevations) Use "OK" for items checked or actual numbers for items verified/surveyed in the field. Use "N/A" for items that are not applicable to the site that is being certified. Please provide an As -Built Redlined or Mylar drawing showing the following: A. Detention, Drainage Facilities, and Common Open Spaces 1. Pond Certification No detention or water quality pond on this site. — Provide Topographic Records (grading certification with as —built spot elevations) and Volume Verification Calculations. Show both the proposed and as -built elevations on the same plan sheet. — Provide Pond Cross -Sections and Spot Elevations (especially @ Pond Embankment and Pond Flow Line) — Positive Fall to Pan (if applicable) — General Pond Grading including all Side -Slopes — Invert Elevation — Forebay Construction and Elevation — Spillway Weir (Location, Elevation, Height, Opening Width) — Placement and size of riprap or alternative permanent erosion control measures — Orifice Plate and/or Water Quality Outlet Structure Installation — Water Quality Capture Volume (Volume Required, Volume Provided and Water Surface Elevation) — Berm and Embankment Compaction Level — Subsurface Media for Water Quality Ponds and Swales 12/12/2014 Revision —Page 1 of 2. Swales No swales on this site — Location (are they within easement?) — Dimension and Cross -Section Verification — Longitudinal Slopes and Side -Slopes — Spot Elevations — Permanent Erosion Control Measures (drop structures, riprap, lining) — Tie-in to Storm Lines, Pans, Curbs, or other appurtenances — Required Minimum Freeboard, Provided Freeboard — Landscaping Infringement on Flow Line? 3. Pioes X Size and Type X Slopes (As -Built and comparison to 0.4% Minimum) — Pipe Capacity Calculations (if slopes are significantly altered from design) X Invert Elevations X Installation and Backfill X Cover Not Verified Encasement and Clearance from other nearby utility lines Not VerifiedJointsType and construction 4. Concrete Pan Channels X — Size X Slope X Cross Section Not Verified Thickness X Elevations Fort Collins 12/12/2014 Revision — Page 2 of 5 5. Inlets X Size and Type X Size of Opening (or name of Standard Detail used) Grate Elevation X Invert Elevation X Box Size 6. Street Cross -Pans X_ Size A Type X Grade X Elevations — Cross -Sectional Depth — Tie-in to Curb and Gutter 7. Culverts No Culverts on site — Size — Type — Invert Elevations — Headwalls or Wing Walls 8. Sub -Drains X Size X Type (Perforated/Solid) X Cover 2L Backfill FCfty of ort Collins 12/12/2014 Revision — Page 3 of 5 City of Fort Collins X Geo-Textile Liners — Clean -Outs 9. Curb cuts There are no curb cuts on this site — Size — Tie-in to Swale, Pipe or other appurtenances 10. Common open Spaces There are no common open spaces on this site — Overall grading contours of open spaces — Spot elevations adjacent to private lots (property corners) B. Low Impact Development (LID) Certification 1. LID Technique Specific Checklists (see attached) X Permeable Interlocking Concrete Pavers (complete if technique utilized on site) A Bioretention Cells (complete if technique utilized on site) C. Grading Certification 1. Certification of Grade Elevations x Minimum Opening Elevations Verified finished floor elevations — Top of Foundation Elevations 11�4 Comparison to 100-year Water Service Elevations ra Comparison to Freeboard Elevations and Base Floodplain Elevations— BFE 2. Verification of Site Grading X Engineer to evaluate site grading compliance with the approved grading plan. X As -built elevations are to be redlined onto the approved grading plan sheet showing the as -built spot elevations next to the design spot elevations so compliance can be verified and documented. 12/12/2014 Revision — Page 4 of 5 City FortS D. Post -Construction Site Cleanup 1. Permanent BMP Measures X Construction Debris Clean -Up (In particular debris affecting the drainage) X Smoothing of Ruts in all Construction Areas X Reseeding of all Areas Affected by Construction Activities (Usually enforced by the City's Erosion Control Inspector but the engineer certifying the site needs to notify the contractor if areas are not seeded) Only applies to LID Swale, all other areas paved E. Statement of Comollance This certification is signed and stamped and by signing this form the Engineer(s) attests that they have inspected the site and to the best of their knowledge the as -built conditions of the drainage facilities are as described in the above form and in the As -Built plans enclosed. Failure to properly disclose all known information could result in the rejection of this certification and prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates of Occupancy within this development. F. Signature and Stamp by a Colorado Registered Professional Engineer Engineers contact information: Patricia Kroetch (Name) tricia@northstardes ign i nc.com (Email address) 970-686-6939 (Telephone number) North Star Design, Inc. (Company Name) 700 Automation Drive, Unit 1, Windsor, CO (Company Address) PE STAMP 12/12/2014 Revision — Page 5 of 5 Foty of rtes �r Construction Inspection Checklist for Permeable Interlocking Concrete Pavers Item/Activity Yes I No I N/A Documentation/Submittal Requirements Excavation Post -excavation infiltration rates arc consistent with design infiltration capacity (for" or partial infiltration" designs) x Irapermeable Liner Impermeable liner meets design specifications x Lmliernicable liner attached to concrete perimeter wall X Impermeable liner is not exposed x Any Penetrations of the impermeable liner have been sealed and checked for water -tightness. x Concrete Cut -Off Wall Meets Specifications for: X - Dimensions - Reinforcement - Footings Underdrain System Underdrain pipe is per design secifcations x At least one cleanout is provided per underdrain lateral x Cleanout pipe is not perforated Cleanouts covers are installed and watertight Underdrain is NOT wrapped in geotextile fabric x Underdrain orifice plate installed at outlet structure x Underdrain integrity tested after backfilling using TV and/or water test X Aggregate Base coarse e.. #2/4 has 90% fractured faces X Beddingcoarse e.. #89 is thorou hl washed X Subbase materials are installed and compacted according to manufacturer specifications I x Protection During Construction 12/122014 Revision - Page I of 2 PICP area is protected from construction site sediment, including runoff from the upstream catchment and FX construction equipment traffic. Close Out Upstream catchment is stabilized prior to diverting runoff into PICP system _ x Of Crcy' � I V122014R.vm.n- Page 2 of2 C rt Collins Construction Inspection Checklist forte LID Swale Item/Activity Yes I No I N/A Documentation/Submittal Requirements Excavation Heavy equipment did not travel over bioretention cell during excavation X Bottom of cell was "ripped" after excavation x I Photograph before/after "ripping". Bottom of cell is flat and level X Photograph Excavated area is protected/surrounded by sediment/runoff control BMPs during construction X I I Photograph Inlet Inlet invert elevation is at least 3 inches above containment wall/berm X Measure/record distance between inlet and top of containment walllberm Upstream catchment drains to inlet x Foreba Forebay is installed according to esign specifications X Forebay has flat. concrete bottom Outlet Structure/Overflow Outlet structure/overflow elevation is confirmed X Measure/record distance from overflow to top of media filter Im ermeable Liner Impermeable Iincr meets design specifications X Impermeable liner attached to concrete perimeter wall X Impermeable liner is not exposed X UnJerdrain System Underdrain pipe is per design specifications At least one cleanout is provided per underdrain lateral X Cleanout pipe is not perforated Cleanouts covers are installed and watertight Underdrrun is NOT wrapped in eotextile fabric X Undcrdrain orifice late installed at outlet structure X Underdrain integrity tested after backfilling using TV and/or water test X 12/12/2014 Revision - Page 1 or2 Filter Media Filter media composition is per design specifications X Filter media was "machine mixed" by supplier prior to delivery X Filtcr media installed Flat and level X Other Structural Components Containment wall/berm is continuous and level X Landscaping Final landscaping does NOT include sod x Final landscaping (wood/rock mulch) is Flat and level x Vegetation is planted according to Landscape design specifications ecifications X Verify that weed barrier is not installed X Temporary irrigation installed X If N/A, then verify that permanent irrigation is installed to establish/maintain vegetation Close Out Upstream catchment stabilized prior to diverting runoff into bioretention cell I X 12/12120W Revision -Page 2 of2 RECORD DRA W/lVG \ \ \ \ n rMa<a F. �E9EN0 - Mzcan KvxYN. j , A. sxu o Ea EttE w AVNAu MwYrn r EamNFs m zo zo to .o pa Y \ \ E°C LM V RNp6R 11 Mtl'PdC S CattVFs � m rwwEax vnw030 IxRGA NI® ,/ \ YSY r corvErz P.x `\ ♦ \`,\ EpSnryt FOR J `` \ Enmlc n Mixn¢ vmc � s y g'b'Ybs4 <mcPMM A.E PEXNEAME PXwn', Y WSiA AS H.A,aID LID DETAIL scue: "-to' RECORD DRAWING NOTES - `[/\//\,,•`�Wa,wwi \ \ E .Y[VO G, WONRWPTII[tD BI f(flB/dl' m sNiEmv ae/?/iS 9/r9/u.ao rryl9As. 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