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Home My WebLink AboutSite Certifications - 12/16/1996Engineering Consultants A division of The Sear -Brown Group 209 S. Meldrum Fort Collins, Colorado 80521 970/482-5922 December 12, 1996 Mr. Basil Hamdan City of Fort Collins Utility Services, Stormwater 235 Matthews Street Fort Collins, CO 80522 STORMWATER RECEIVED DEC 13 1996 RE: Harmony Market P.U.D.; Twelfth Filing Drainage Certification for Certificate of Occupancy Dear Basil: We are hereby completing a drainage certification for Harmony Market P.U.D., Twelfth Filing. The intent of this letter is to verify the existence and quality of drainage utilities serving the twelfth Filing. Bogaard Construction is seeking a certificate of occupancy for the building that has been constructed at this location. This issue has prompted the need for this certification. The attached drawing will serve as the record document of existing elevations and information surveyed on December 11, 1996. The following items are in compliance with the Utility Plans: 1. The building has been constructed to an FF elevation acceptable to facilitate drainage away from the floor slab. The floor slab for the building was built.at the elevation shown in red on the attached drawing ( Proposed FF=5002.9; Existing FF=5002.9). Regarding the landscaping and concrete around the building, field investigation indicates positive slopes out to the parking lots and positive slopes into the backside drain. 2. The parking lot obviously drains to the south, based on a field investigation of the existing condition. 3. The metal sidewalk culverts and curb openings have been constructed to the size and location of those indicated on the plans. As opposed to using galvanized metal plates to cover the culverts next to the building, the contractor used an open grate cover. Denver303/458-5526 The. following item appears to be in compliance with the Utility Plans but not constructed as indicated: 01. Section A-3: As mentioned above, there is a drain on the north side of the building, or the backside of the building. The proposed design indicates a trickle pan to be constructed there to drain a Q100 of 1.2 cfs from the area directly next to the building. This area has the potential to flood because it is bound to the north by a retaining wall and to the south by the building. During construction, the architect and contractor wished to remove the trickle pan from being up against the building and have the proposed sidewalk moved there instead. Since a drainage feature was still necessary, a subdrain was chosen instead. The cross-section of this subdrain has been indicated on the redlined plan, and a brief analysis has been included to indicate the performance capability of the new subdrain. This subdrain, along with its accompanying cobble Swale can pass the necessary flow. The 4" perforated PVC pipe can pass approximately 0.16 cfs (nuisance flows) and the cobble swale which covers the pipe can pass approximately 1.04 cfs at 0.49' deep. This certification is signed and stamped. By signing this letter I attest that, to the best of my knowledge, the record document conditions of the drainage facilities are described above and on the redlined plans attached. Failure to properly disclose all known information could result in rejection of this certification and prevent the release of any Stormwater Utility holds on Building Permits and /or Certificates of Occupancy. Thank you for reviewing this certification. Please feel free to call Perry Cabot with any questions. Sincerely, RBD, INC. Prepared by: ere Cabot, IT Projec gineer cc: John Sailor, Bogaard Construction 6.73-003 (A) Correspondence H:\USER\civil\projects\harmony.1 Mcert.001 Reviewed by: Kevin W. Gingeryt7" Water Resources Project MandyC, RED INC. ENGINEERING CONSULTANTS CHANNEL RATING INFORMATION HARMONY TWELFTH STA ELEV 0.00 20.00�� 0.00 196.00 1.7, Q 106) = O::i(c�,( WDePlt,r� 0.00 20.00 - �- 0.00 19.00 - 4.00 18.91 _._. 6.00 18.58 8.00 18.91 8.00 20.00 'N' VALUE ---------- SLOPE ------------- (ft/ft) 0.060 0.0040 ELEVATION AREA VELOCITY DISCHARGE FROUDE (feet) --------- (sq ft) ------- (fps) -------- (cfs) --------- NO. ------ 18.68 0.1 0.2 0.01 0.17 18.78 0.2 0.3 0.08 0.19 18.88 0.5 0.4 0.24 0.20 18.98 1.0 0.4 0.46 0.20 19.08 1.8 0.6 1.06 0.21 19.18 2.6 0.7 1.90 0.22 19.28 3.4 0.8 2.91 0.23 19.38 4.2 1.0 4.06 0.23 19.48 5.0 1.1 5.34 0.24 19.58 5.8 1.2 6.73 0.24 19.68 6.6 1.2 8.21 0.24 19.78 7.4 1.3 9.79 0.24 19.88 8.2 1.4 11.45 0.24 19.98 9.0 1.5 13.18 0.24 ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- OPEN CHANNEL FLOW ANALYSIS: FLOW IN A PIPE Developed by Dr James Guo, Civil Eng Dept, U of Colorado at Denver Metro Denver Cities/Counties and UD&FCD Pool Fund Study ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- User= KEVIN GINGERY RBD INC. FT. COLLINS COLORADO ............................. ON DATE 12-12-1996 AT TIME 07:59:14 * PROJECT TITLE: HARMONY TWELFTH * DESIGN INFORMATION IPE (EQUIVALENT) DIAMETER(INCHES) = 4.00 IPE ROUGHNESS MANNING N = 0.010 IPELINE SLOPE (FT/FT) = 0.0040 ESIGN FLOW RATE (CFS) = 0.16 * NORMAL FLOW CONDITIONS: LOW CENTRAL ANGLE (DEGREE) = 359.28 LOW DEPTH (FEET) = 0.33 LOW AREA (SQ FEET) = 0.09 LOW VELOCITY (FPS) = 1.80 PECIFIC ENERGY (FT) _ 0.38 PECIFIC FORCE (KLB) = 0.00 LOW FROUDE NUMBER = 0.00 NOTE: FROUDE NUMBER=O MEANS FLOWING FULL. * CRITICAL FLOW CONDITIONS : LOW CENTRAL ANGLE LOW DEPTH LOW AREA LOW VELOCITY INIMUM SPECIFIC ENERGY INIMUM SPECIFIC FORCE LOPE (DEGREE) = 219.595 (FEET) = 0.22 (SQ FEET) = 0.06 (FPS) = 2.52 (FT) = 0.32 (KLB) = 0.00 (FT/FT) = 0.0064 F44" _ I L. I SCALE 1"20' slulu4 ILL. �cCCW.ES M 1 PEeTt#P110.1 MJ �� WARPED PAVEMENT DETAIL 3C JI I - h4i4%1k1tli 'Y1Vh"�tl F Yw.lOah�I $TA. ,1+3098 SEAL JCINT-BETWLiN.. - . IL _END RETAINHC WALL SIDEWALK AND RETAINING S wnu I pia• .. tisDE ux�%.. . -may 51.. WALL WT GOxY1RI[.'FIF 1ED IJO'1 CWSl0M.1ED =/I RT B {gHUWE} #- 5LCY 9 •J STA 0*00 -_ BEGIN RETAINING WALL I 1-4M VBt.P LED NA 4♦` 1 .. o� / S/ �•'- 67 2' METAL r,'WM 6 OIL 2' METAL "fiewwM SIDEWALK, ° I p McLFIRP AOEWALK, ( CULVERT 1 + a od CULVERT11 hill I. ` TIY \P. 1 1 i1.'ie�'pMs'/kWl4nt.'.'2Wvn 6:•roo. S NNBE lC A II¢V.rl � ' s '2' METAL VE0FIED _ Y METAL I REMOVE IM LF DE CULVERT - V IOU SIDEYIALX CULMT CURB AND OUTIEH TO k .PM DRAW! PEC DESDIED OFS OIEIXEDInI MAY 18% aTJ-OOJ Enghreering Conaullenta AN !NA, wd',n st"I MIA C. snle W 2410 K. Nlu AN, MPROWD DAD. PROECI N0. ! .rn....., ,. Ix A., ANN, 9ID/coh" 970 [MF¢ [aemo mvl ] ql/GII' !y L I f II l Ill l I I ' CUTBACK STEAKHOUSE SCALE 1' . TO - OUTBACK STEAKHOUSE {' A. , Vi"IE21A I 1- 1. ACCESS RAMP e N.T.S. 1 LEGEND EXISTING SPOT ELEVARM PROPOSED SPOT ELEVATION 91 PROPOSED SPOT ELEVATION REPLACING EXISTING SPOT ELEVATION —�-� PROPOSED CONTOUR EXISTING CONTOUR OUTFALL CURB k GUTTER INFLOW CURB B CUTTER E2 REMOVE EXISTING CURB h GUTTER DRIVEWAYS W TRUCK TRAFFIC PROPOSED RETAINING WALL ya1 pePIlj CALL OWNEERi s w�pnAo� NOTES. ` 1-800-922-1987 ' 534-6700 1. ALL SPOT ELEVAROTO ARE FLONJNE OR TOP OF PAVFIENT UNLESS OTHERNM CITED. �.•a�3'L:i�.... 5010 2. SEE DRAINAGE AND 7ROSION CONTROL PLAN FOR MORE DETAILED DRAINAGE DESIGN. 3. SEE LANDSCAPE N FOR DETAILS OF AMENITES, SUCH AS City of Port CoBim, Colorado PLANTING AREAS, N iT SPECIFICALLY LABELED ON THESE PLANS. ullum f AP ROYAL 50ofi APPROVED: F7r�pj�� -- --- - - _- 1. BENCHMARKS: Dtra1w N GQw TAG BOLT ON THE FIRE HYDRANT AT THE SOUTHEAST CHECKED BY: b">bAY CORNER OF LEMA AND HARMONYDate b e e ELEVATION : AM 33 CHECKED BY 5000 SOUTH BONNET B T, FIRE HYDRANT LOCATED AT THE SOUTHEAST MWIL a ♦ 1a >o CORNER OF LEMA AVENUE AND OAKRIDGE DRIVE CHECKED BY: REV. 4954.30 T�p1A� IYY 1 e, , yM 1�1 wIT. 9 t 2.5 a DALE OF TOPOCRM 1ICAL SURVEY JULY B, 1995 AND CHECKED BY: SCALE N MET FEB. 1, 1996 BY RBO. INC. DtlI CHECKED BY: FH HARMONY MARKET P.U.D. TWELFTH FILING FINAL GRADING PLAN T F BOGAARD CONSTRUCTION, INC. 7 11