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Home My WebLink AboutSite Certifications - 11/05/2008N I NORTHERN ENGINEERING November 3, 2008 Mr. Glen Schlueter Fort Collins Stormwater Utility 700 Wood St. Ft.Collins, CO 80522 RE: Hageman Earth Cycle Drainage Certification Project Number: 418-001 Dear Glen: ADDRESS: PHONE:970.221.4158 WEBSITE: 200 S. College Ave. Suite 100 w".northernengineering.com Fort Collins, CO90524 FAX:970.221.4159 /9 l,C't G This drainage certification letter for Hageman Earth Cycle is intended to follow up our previous partial drainage certification letter dated October 16, 2008. At the time of the first letter, a portion of the berm called for along the south perimeter of the west portion of the site noted as "Basin 3" in the Plan had not been completed. This berm has now been completed. The project engineer conducted a site visit on October 31, 2008 in to verify grading of the berm, and found the berm to be in substantial compliance with the design plan. Therefore, based on the survey data and personal site inspection, we believe that all major drainage improvements have now been constructed in general compliance with the design. If you require additional information or analysis regarding this project please contact me at 221-4158 ext.106. Sincerely, NORTHERN ENGINEERING SERVICES, INC. Aaron Cvar, P.E. Senior Engineer cc: Roger Hageman, Hageman Earth Cycle NORTHERN ENGINEERING October 16, 2008 Mr. Glen Schlueter Fort Collins Stormwater Utility 700 Wood St. Ft.Collins, CO 80522 RE: Hageman Earth Cycle Partial Drainage Certification Project Number: 418-001 Dear Jay: ADDRESS: PHONE: 970.221.4158 200 S. College Ave. Suite 100 WESSITE: Fort Collins, CO80524 FAX.970.221.4159 Northern Engineering.com We have completed our review of the as -constructed drainage improvements for the above referenced project as related to the approved "Stormwater Management Plan for Hageman Earth Cycle", dated August 27, 2008. This certification is intended to verify compliance with this approved Plan. Field surveys of the site were conducted by Northern Engineering in August and October of 2008 and have been used to verify general conformance to the Plan. The project engineer conducted site visits in August and October of 2008 to verify grading and drainage improvements. Based on the survey data and personal site inspection, we believe that all major drainage improvements have been constructed in general compliance with the design with the following exception: A portion of the berm called for along the south perimeter of the west portion of the site noted as "Basin 3" in the Plan has not been completed It is our understanding that the reason this has not been completed is a lack of available fill material, however the owner has stated that he will obtain the needed material and complete the berm in the next few weeks. We will follow up with an additional letter to you verifying the completion of the berm at a later date. The volume for the combined Ponds 1 and 2 was calculated from the topography provided by Northern Engineering. The design volume for the combined Ponds 1 and 2 was 0.64 acre-feet; the as - built pond achieves a total storage volume of 0.90 acre-feet. Thus, we conclude that combined Ponds 1 and 2 will perform adequately with the design intent. Please see the attached as -built information for combined Ponds 1 and 2. The volume for Pond 3 was calculated from the topography provided by Northern Engineering. The design volume for Pond 3 was 0.53 acre-feet; the as -built pond achieves a total storage volume of 0.50 acre-feet. Thus, we conclude that Pond 3 will perform adequately with the design intent. Please see the attached as -built information for Pond 3. There are minor inconsistencies throughout the site; however, the performance of the drainage design, in my opinion, will not be hindered. To the best of my knowledge the major drainage improvements for the project site, apart from the above mentioned item, are constructed in substantial compliance with the design intent of the approved construction drawings. If you require additional information or analysis regarding this project please contact me at 221-4158 ext.106. Sincerely, NORTHERN ENGINEERING SERVICES, INC. OL Aaron Cvar, P.E. Senior Engineer cc: Roger Hageman, Hageman Earth Cycle Pond Volume Calculations - Existing Ponds 1 and 2 combined Project: 418-001 By: ATC Date: 8.29.08 Note. Volume calculations utilize Conic Method Pond Stage Depth Surface Area of Contour Incremental Volume C Total Volume C Total Volume A 85 0.00 349 0 0 0.000 86 1.00 4521 2040 2040 0.047 87 1.00 10469 7283 9323 0.214 88 1.00 1 24615 1 17029 1 26351 1 0.605 88.62 0.62 39234 0.901 89 1.00 44208 33903 60254 1.383 Pond 2 spills at elevation 88.62, thus, total as -built volume is 0.90 ac-ft ,y Jobs1418-0011bwMTOPO4o fesW MOM 2Pond TOPO &27{98.dwg, 8/28/2008 2:48:59 PM Ili I- 11 \ po�1n I \ \h0 11 \ 11 \ 1\ \ 1\ 1 II \ I lj\I cl � IIII III \ � / LINE LEGEND IIli I / I — — — — MAJOR CONTOUR III 1 \ — — — — MINOR CONTOUR III \ III \\ \\ 11111 \ \ IIII \ 1 - Illl \ II II IIII fill I / IIII I I I IIII I I I� IIII 1 1 IIII I 1 IIII I I IIII I 1 11111\ � I v r-kvS •r Z- IIIII \ Elul / T-o,eo Star 'PY 1\iot�1'l a� Po' ,Jc y Pond Volume Calculations - Existing Pond 3 Project: 418-001 By: ATC Date: 10.16.08 (Vote. Volume calculations uBlize Conic Method Pond Stage Depth Surface Area of Contour S Incremental Volume CF Total Volume C Total Volume A 85 0.00 2636 86 1.00 15771 8277 8277 0.190 86.5 0.50 0.500 87 1.00 40283 27059 1 35336 0.811 Pond 3 spills at elevation 86.51, thus, total as -built volume is 0.50 ao-ft IJ w �il(/��/� —► 1 II III � t x x WIRE FENCE f7 3 -t-'Fe' S++r 3Y 11oe ntr ¢.J V-I Cr. 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