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Home My WebLink AboutSite Certifications - 04/14/2014COMMERCIAL, MULTI -FAMILY AND SUBDIVISION CERTIFICATION CHECKLIST Kaufman & Robinson, Inc. Shop Addition Permit#B1303619 April 8, 2014 (Overall Site Drainage) Clty \. wort Collins 1330 Tr°j q-►o- 317-zLpoi 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 • Provide Topographic Records and Volume Verification Calculations OK • Provide Pond Cross -Sections and Spot Elevations (especially @ Pond Embankment and Pond Flow Line) OK (refer to attached exhibit for elevations) • Positive Fall to Pan (if applicable) OK • General Pond Grading including all Side -Slopes OK • Invert Elevation N/A (existing pipe and structure) • Forebay Construction and Elevation N/A • Spillway Weir (Location, Elevation, Height, Opening Width) OK (existing) • Placement and size of riprap or alternative permanent erosion control measures N/A (existing) • Orifice Plate and/or Water Quality Outlet Structure Installation N/A (existing) • Water Quality Capture Volume (Volume Required, Volume Provided and Water Surface Elevation) OK • Berm and Embankment Compaction Level Permit#61303619 art Collins • Subsurface Media for Water Quality Ponds and Swales N/A 2. Swales • Location (are they within easement?) OK • Dimension and Cross -Section Verification OK • Longitudinal Slopes and Side -Slopes OK • Spot Elevations OK • Permanent Erosion Control Measures (drop structures, riprap, lining) N/A • Tie-in to Storm Lines, Pans, Curbs, or other appurtenances OK • Required Minimum Freeboard, Provided Freeboard OK (refer to attached calculation) • Landscaping Infringement on Flow Line? • Size and Type N/A • Slopes (As -Built and comparison to 0.4% Minimum) N/A • Pipe Capacity Calculations (if slopes are significantly altered from design) N/A • Invert Elevations N/A • Installation and Backfill N/A • Cover N/A • Encasement and Clearance from other nearby utility lines N/A • Joints Type and construction N/A Permit#61303619 2 drt Collins 4. Concrete Pan Channels • Size OK • Slope OK • Cross Section OK • Thickness OK • Elevations OK 5. Inlets • Size and Type N/A • Size of Opening (or name of Standard Detail used) N/A • Grate Elevation N/A • Invert Elevation N/A • Box Size N/A 6. Street Cross -Pans • Size N/A • Type N/A • Grade N/A • Elevations N/A • Cross -Sectional Depth N/A • Tie-in to Curb and Gutter Permit#B1303619 3 t Cfty rrCollins N/A 7. Culverts • Size N/A • Type N/A • Invert Elevations N/A • Headwalls or Wing Walls N/A 8. Sub -Drains • Size N/A • Type (Perforated/Solid) N/A • Cover N/A • Backfill N/A • Geo-Textile Liners N/A • Clean -Outs N/A 9. Curb Cuts • Size OK • Tie-in to Swale, Pipe or other appurtenances OK 10. Common Open Spaces • Overall grading contours of open spaces N/A • Spot elevations adjacent to private lots (property corners) N/A Permit#B1303619 4 �rt Collins B. Grading certification 1. Certification of Grade Elevations: • Minimum Opening Elevations OK • Top of Foundation Elevations OK • Comparison to 100-year Water Service Elevations OK • Comparison to Freeboard Elevations and Base Floodplain Elevations — BFE OK 2. Verification of site grading: • Engineer to evaluate site grading compliance with the approved grading plan. OK (refer to attached exhibit for elevations) • 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. OK (refer to attached exhibit for elevations) C. Certification of Erosion Control Measures: 1. Permanent BMP Measures: • Permanent Vegetation (no more than 6" bare spots and weeds under control) • Riprap or alternative permanent erosion material N/A • Riprap Bedding N/A • Cut -Off Walls or Channel Drop Structures Cross -Sections N/A • Sediment Basins N/A • Water quality ponds/Sand Filter/Bio Retention Construction and liners N/A • Permanent Netting Mats or Blankets N/A • Mulching and Seeding 2. Temporary BMP Measures: Permit #B1303619 5 crt Collins • Mulching and Seeding • Temporary BMP Measures as shown on Erosion Control Plan D. Post -Construction Site Cleanup: • Construction Debris Clean -Up (In particular debris affecting the drainage) OK • Smoothing of Ruts in all Construction Areas OK • 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) E. Statement of Compliance: 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 REGlsi 4115;c �oF�ss�ON A1. Permit#B1303619 6 STAGE -STORAGE FOR IRREGULAR GEOMETRY Project: Kaufman & Robinson, Inc. Shop Addition Basin ID: Revised Detention Pond A - Pond Certification 4/8/2014 Design Information (Input): From the pond site grading plan, enter water surface elevations and measured contour areas in ascending order. Water Surface Elevation ft Eq-elev. Contour Area square feet nput Volume above Datum acre-ft (ou. 4966.410 0.000 4966.50 600 0.001 4966.86 8,000 0.036 4967.00 14100 0.072 4967.50 16,200 0,249 4967.82 16,700 0.369 4968.00 17,000 0.439 4968.82 17.700 0.766 IWQSEL 1100-yr WSEL (add'I vol. provided) Top of Pond KRI ASB pond volume 2014-03-26.x1s. Irregular 4/8/2014, 11:13 AM Worksheet for KRi Swale to Pond 1.33X100-vr Flow Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.030 Channel Slope 0.90 % Left Side Slope 4.00 ft/ft (H:V) Right Side Slope 4.00 ft/ft (H:V) Bottom Width 0.50 ft Discharge 9.40 ft3/s Results Normal Depth 0.86 ft Flow Area 3.42 ft2 Wetted Perimeter 7.62 ft Hydraulic Radius 0.45 ft Top Width 7.41 ft Critical Depth 0.75 ft Critical Slope 0.01843 ft/ft Velocity 2.75 ft/s Velocity Head 0.12 ft Specific Energy 0.98 ft Froude Number 0.71 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity fUs Normal Depth 0.86 ft Critical Depth 0.75 ft Channel Slope 0.90 % Bentley Systems, Inc. Haestad Methods SolBtiatldjclhb xM aster V8i (SELECTseries 1) (08.11.01.031 418/2014 11:24:48 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 2 Worksheet for KRi Swale to Pond 1.33X100-vr Flow GVF Output Data Critical Slope 0.01843 ft/ft Bentley Systems, Inc. Haestad Methods SoIBliofl6;cFiaNM aster V8i (SELECTseries 1) [08.11.01.03] 4/812014 11:24:48 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 2 of 2 Cross Section for KRi Swale to Pond 1.33X100-vr Flow Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.030 Channel Slope 0.90 Normal Depth 0.86 ft Left Side Slope 4.00 ft/ft (H:V) Right Side Slope 4.00 fUft (H:V) Bottom Width 0.50 ft Discharge 9.40 ft'/s Cross Section Image 0.50 ft C 86 rt H. ] Bentley Systems, Inc. Haestad Methods So18bod4jefibrvMaster V8i (SELECTsenes 1) (08.11.01.03] 4/8/2014 11:22:01 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1.203-755-1666 Page 1 of 1 BENCHMARK CITY OF FORT COLLINS V-401, IN FORT COLLINS, AT THE JUNCTION OF U.S. HIGHWAY 287 AND BRISTLECONE DRIVE, 194.9 FEET EAST OF THE CENTERLINE OF THE NORTHBOUND LANES OF THE HIGHWAY, 48.2 FEET NORTH OF THE CENTER OF THE DRIVE, AND 3.6 FEET NORTH OF A UTILITY POLE AND POWERLINE CROSSING OF THE DRIVE. BENCHMARK DESCRIPTION: A STAINLESS STEEL ROD SET TO THE DEPTH OF 6.7 METERS ENCASED IN A PIPE FLUSH WITH THE GROUND. NOTE: ACCESS TO THE BENCHMARK IS THROUGH A 5 INCH LOGO CAP. BENCHMARK ELEVATION: 4974.64 CITY OF FORT COLLINS 42-97, ON TOP OF A STORM INLET STRUCTURE ON THE EAST SIDE OF REDWOOD STREET, 400 FEET SOUTH OF WILLOX LANE. BENCHMARK ELEVATION: 4966.75 PROPERTY LINE . . . . . , - . 11 EXISTING BUILDING EX. FFE - 4971.52 r_'EXISTING CONCRETE CHANNEL 4970 Z= . . ..... ......... . . . . . . . . . . 22 49-10 7 I& . b9 e'l fj 4-1 BUILDING ADDITION FFE = 4971.52 FFE 4971.49 AB DETENTION POND A 'Ilk RETAINING w >/ RETAINING WALL LL 4970 '69. 0 WALL EXISTING EXISTING 12.. ADS TO OUTLET Ow 69,STRUCTURE 67. 5 9.43 AS .6 AS EXISTING 12" FES W/ RIPRAP 66 ntl- \Z 0.47 AB 69 qWAl E 0 0.9X2' 7 CONCRETE PAN 9 66 0 47** A13 DETENTION POND A 7-1 0.4% AB PROPERTY LINE 4967 - — __CiC - - - - - - - - 4968- to - - - - - 4 9 6 9 — ..... EXISTING FENCE CERTIFICATION NOTES 1. SURVEY DATA AND ELEVATIONS PROVIDED BY WASHBURN LEGEND LAND SURVEYING, LLC DETENTION POND A AB AS -BUILT INV. INVERT .12. ADD 4900' TO EACH SPOT ELEVATION TO GET BENCHMAR_voo� n 37963 z- AIAL LO'� 100—YR REQUIRED VOLUME 0.348 AC —FT 100—YR VOLUME PROVIDED 0.369 AC —FT WQCV REQUIRED 0.029 AC —FT WQCV PROVIDED 0.036 AC —FT BOW 8070M OF WALL EX. EXISTING FF FINISHED FLOOR FIFE FINISHED FLOOR ELEVATION FG FINISHED GRADE FL FLOW LINE LP LOW POINT PAD CONCRETE PAD SPILL SPILLWAY TOP TOP OF BANK TOW TOP OF WALL 68.8 68.95 __X. T EX TOP 167.84 67.81 I EX. S L X. SPILL EX. S67.82I L I .8 SPILL X. I P 7 �)r fte p 68.87 AS 6 PROPERTY LINE 7Z ECEIVE'R, APR 10 2014 BY: 0 15 30 SCAL i,�EXISTING EVERGREEN WEST POND HIGH WATER LINE ELEV. - 4962.5 EMERGENCY OVERFLOW SPILLWAY NOTES 1. THIS GRADING CERTIFICATION IS BASED ON INFORMATION FROM THE APPROVED KAUFMAN & ROBINSON. INC. SHOP ADDITION PLANS. 2. THE TOP OF FOUNDATION ELEVATION SHOWN IS THE MINIMUM ELEVATION REQUIRED FOR PROTECTION FROM THE 100—YR STORM. #131303619 AND �J—U—B FOR AND ON BEHALF OF WASHBURN JEERS, INC. LAND SURVEYING, LLC