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Home My WebLink AboutSite Certifications - 07/26/1996STORMWATER �(- RECEIVED0M IZ�� JUL 2 2 1996 '. July 18, 1996 .wx. Mr. Basil Hamden City of Fort Collins Stormwater Utility Department P.O. Box 580 Fort Collins, CO 80522-0580 Re: Harbor Walk Estates Phase II Project No. 10-618-010 Dear Basil: Enclosed please find our Stormwater Certification for(Harbo� Walk Estates Phase W The material provided is as follows: Sheets 5 and 8 of the construction documents with appropriate as -built information shown. Drainage Certification Form with applicable items checked, signed, and stamped by a professional engineer. All improvements as depicted on our utility drawings have been installed. At the time of our field survey all drainage facilities (i.e. swales, channels, inlets, and pipes) had been installed, except one 20' portion of ADS and the FES needs to be installed when the lake level permits. If you should have any questions or concerns, please do not hesitate to call. Respectfully, TST, INC. CONSULTING ENGINEERS Steve F. Humann, P.E. DLP/Ig Enclosures q o; AW A25026 a Don L. Patchett TSTINC. 748 Whalers Way — BuildingD 102 Inverness Terrace Fast ! Fort Collins, CO 80525 Suite 105 Consulting Engineers (970) 226-0557 Englewood, CO 80112 Metro Denver (303) 595-9103 (303) 792-0557 Fax (970) 226-0204 Fax (303) 792-9489 DRAINAGE CERTIFICATION FORM Please fill out all applicable items in this certification form for single family, multi -family, and commercial properties. Write "OK" for items checked or actual number checked in field. Use "N/A" for items that are not applicable to the property that is being certified. A. Drainage Facilities Certification 1. Pond Certification Volume Verification �f3 a. Topographic records and volume, b. Cross -sections and spot elevations kk 1, Positive Fall to Pan Side Slopes_ Invert Elevation Spillway Elevation �1 Placement and Size of Riprap Side Slopes \AA , Grading AIL Orifice Plate Installation and Size Compaction of Berm NA Structural Integrity of Pond Nlk 2. Swales Location (are they within easement) At Dimensions and Cross-section Verification Longitudinal Slopes and Side Slopes Spot Elevations N1� Permanent Erosion Control Measures (drop structures, riprap, etc...) Tie-in to Pipes, Pans, Curbs, etc... Nl� Weir Size (elevations, size, opening, etc...) 1• k Available Freeboard Landscaping Infringement on Swales 3. Pipes Size and Type Slopes (as -built and comparison to minimum 0.4% slope) ✓ Pipe Capacity Calculations ✓ (if slopes are significantly altered) Invert Elevations Installation and Backfill Material ✓ Cover ' Encasement and Clearance (from other utility lines close by) / Joints 4. Concrete Pan Channels Size 11� Slope Super Elevation 1�1 Cross-section Thickness a Elevations 5. Inlets Size and Type • Size of Opening (or name of standard used) Grate Elevation Invert Elevation Box Size 6. Cross Pans Size Type Grade �11� Elevation N 0, Cross -sectional Depth N!A, Tie-in to Curb and Gutter �� B. C. 7. Culverts Size Type Invert Elevation Headwalls 8. Underdrains Size Type _L13 Cover Backfill �l Geotextiles 11.L- Cleanouts SAL 9. Curb Cuts size_ Tie in to Swale, Pipe, etc... Certification. of Grade Elevations Adjacent to Drainage Facilities Minimum Opening Elevations / " Top of Foundation Elevations Comparison to 100 Year WSEL's �11k (Freeboard requirements and floodplain issues) Certification of Erosion Control Measures 1. Permanent Measures Permanent VegetationL- (6" bare spots and weeds under control) Riprap Riprap Bedding Drop Sections �J Sediment Basins/Water Quality Ponds Netting Mats/Blankets A_ Mulching �1L� 2. Temporary Measures Mulching Inlet Filter Installation Check Bale Dams , Seeding and Temporary Vegetation . • FA V t_ Silt Fence SL% D. Site Cleanup After Construction Construction Clean Up _ Smoothing of Ruts Reseeding _ LAIA_ E. Statement of Compliance This certification is signed and stamped and by signing this form the engineer (s) attests that to the best of his knowledge the as -built conditions of the drainage facilities are as described in the above form and in the redlined plans enclosed. Failure to properly disclose all know information could result in the rejection of this certification and prevent the release of any Stormwater Utility holds on Building Permits and/or Certificate of Occupancy. F. Signature and Stamp by a Colorado Registered Professional Engineer