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HomeMy WebLinkAboutSite Certifications - 06/18/1999October 14, 1998 Mr. Basil Harridan City of Fort Collins Utility Services Stormwater 700 Wood Street Fort Collins, Colorado 80522 RE: Shenandoah 11 Filing Drainage Certification Dear Basil, The following letter is a certification of drainage facilities as installed at Shenandoah 1' Filing. This certification is based on a site visits on by Northern Engineering Services, and by a field survey by Landstar Surveying in October 1998 Attached are copies of the approved Final Grading and Erosion Control Plans for Shenandoah I' Filing, with the Design and Field Verified elevations highlighted. Plan elevations, if not noted on the grading plan have also been included. Also attached is a copy of Ponds A and 18 volumes, and the field generated contours of ponds A & 18 Items installed with 1' Filing include the following: Detention Pond A.w/ outlet pipe Detention Pond 18 w/ outlet pipe (overflow weir is roughed in) Storm sewers and inlets at the ends of Egyptian Court and Kaslam Court Storm sewers in Strasburg and Triangle Drive Irrigation culvert crossing Triangle Drive Other storm improvements not located in public Rights -of -Ways, as shown Erosion control as shown on the approved utility plans. All of the items described above have been'installed per the approved plans with the following exceptions: Downstream mitigation per mtg with Stormwater & Natural resources Overflow weir at pond 18 Thank you for your time and consideration. Please feel free to call if you have any questions regarding this letter. Sincerely, s Roger Curtiss P.E. - Northern Engineering cc: Ed Zebrowski - US Homes Gregg Seebohm - Empire Construi 420 SOUTH HOWES, SUITE 202, FORT (OLLINS, (OLORADO 80521, (970) 221-4158, FAX (970) 221-4159 DETENTION POND HIGH WATER LINE AS BUILT OF POND 18 - SHENANDOAH 1ST FILING 39.204.0 = REQ. VOLUME (0.90 ac.ft.) CONTOUR AREA AVG AREA INTERVAL CUMULATIVE HIGH WATER Contour Storage (sq.ft.) (sq.ft.) VOLUME (cu.ft.) VOL (cu.ft.) LINE (ft.) 16.43 10.0 16.4 0.0 543.0 204.2 204.2 17.0 1.076.0 0.0 17.0 0.0 4.516.5 3,986.3 4,190.6 18.0 7,957.0 0.0 18.0 0.1 10.000.0 9.929.7 14,120.3 19.0 12,043.0 0.0 19.0 0.3 12,827.5 12,819.5 26.939.8 20.0 13,612.0 20.8 20.0 0.6 15.587.5 15,545.6 42,485.4 21.0 17,563.0 0.0 21.0 1.0 NOTES: 1. FOR THE FIRST CONTOUR VOLUME A CONIC SHAPE WAS ASSUMED VOL. = 113 (AREA ABOVE) (DIFFERENCE IN CONTOUR ELEV.) 2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2) VOL. = DEPTH/3 (A +(ABr.5 + B) FOR: Uniform Sides sec.(9.2) 3. HWL=(VOL.REQ.-VOL.LOW CUML)'3/(AREA LOW+AREA HIGH+(low area`high area)^.5) 20.79 = HWL POND Actual Pond Invert - 16.43 Plan Pond Invert - 16.35 Actual Overflow elevation - 20.92 Plan Overflow Elevation - 20.9 Top Of Berm - 21.9 7 1� DETENTION POND HIGH WATER LINE AS BUILT OF POND A - SHENANDOAH 1ST FILING 34.848.0 = REQ. VOLUME (0.80 ac.ft.) CONTOUR AREA AVG AREA INTERVAL CUMULATIVE HIGH WATER Contour Storage (sq.ft.) (sq.ft.) VOLUME (cu.ft.) VOL (cu.ft.) LINE (ft.) 43.98 10.0 44.0 0.0 14.7 0.1 0.1 44.0 19.3 0.0 44.0 0.0 4,526.7 3,157.0 3,157.1 45.0 9,034.0 0.0 45.0 0.1 10,558.5 10, 521.6 13,678.7 46.0 12,083.0 0.0 46.0 0.3 13,342.0 13,322.2 27,000.9 47.0 14,601.0 47.5 47.0 0.6 16,082.0 16.059.2 43,060.1 48.0 17,563.0 47.6 48.0 1.0 19,344.0 19,316.6 62,376.7 49.0 21,125.0 0.0 49.0 1.4 23,783.5 8,306.8 70,683.5 49.4 26,442.0 0.0 49.4 1.6 NOTES: 1. FOR THE FIRST CONTOUR VOLUME A CONIC SHAPE WAS ASSUMED VOL. = 113 (AREA ABOVE) (DIFFERENCE IN CONTOUR ELEV.) 2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2) VOL. = DEPTH/3 (A +(AB)A.5 + B) FOR: Uniform Sides sec.(9.2) 3. HWL=(VOL.REQ.-VOL.LOW CUML)'3/(AREA LOW+AREA HIGH+(low area high area)A.5) 47.49 = HWL POND Actual Pond Invert - 43.98 Plan Pond Invert - 44.00 Actual Overflow elevation - 49.35 Plan Overflow Elevation - 49.00 Top Of Berm - 49.00 i �_ CT. r• 7, I -I I � I __ 95 rm 63 79 P 9U 3 t 1.: • ■ e9 i t /i 1 ill _ it o- r 37 3 u 3D / / I / I A �I I l d 1k (,III 1 I % I .fA r • KEY MAP _V: I • A CCMWR Will SD, <.«, W17W 309 WILLN SIR WIR.W to," WXLW Sell 12AZ7 13}1 WRD.v3 •arnr � 7'--- _-� MIIVL P`Np MYfI(1 16,3 MILL4 ehAIDY/ EIEVaMXI -'N.9 i I + __ _ � PVN PoxD Ixrxm - 1a.3R flNl OhARDW EIfW,KKI - ZD.91 j 11F Dr BEAY -R1.9 090 M n.. 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(xma Elemmxl sp (M DEiw vn31 wssllc'ex h 1:YI wml d QQ�W WtTH mszn P.Ee nw n.a.u) (wwbc DwNs:xEw) LONGYTWNAL SECTION PROPOSED SIDE —WEIR CROSS SECTION PROPOSED SIDE WEIR PROPOSED SIDE WER 8PLLWAY S NTS NORTHERN ENGINEERING SERVICES °'°" 9641.00 P""` D°` SCALE: 1-=50' �1° s�"' 420 SOUTH HOWES SUITE 202, FT. COLLINS, COLORADO 80521 R�n°N..;,N E� : w DESIGNER : MBW CHECKED BY: RAC (970) 221-4158 DRSFTSMAN:ACAD PREPARED:07 0] 97 ' m all anal, all am am, m0mam unp an an OR Is NM 114 UMMINNED 1� 2all mia NA "a Nola is 1173 574 LEGS . -__-__-__- EximN: =_.DNM ssWr: t ISPNO STORM SEWER INI.� Ppk RD STORM. sFw" Llll� PROPOSED STORM SF Fa INLU —W70--- E%5/HG COMOUR 20 - APFF, EO RNEWOOD h,LLS M" Flm CKE k NmEaY'aADINE 20 — PNOPOSN CONIWR °.....boon• DESIGN DFUQNNE ROU':.P - BASIN LE' OMiON 0 Elm RIPMP OOTLt PPORCnON c%.- Lrw SHF » I 8 SwXLE S-CIOry -N w x_ 'd "ETD YERfIED CI£V1nONs INN oOUTf %0.M1. 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LH MOD DII PCINt PrPROP V u PRORCIPi:.. (SCe DEIM ylEi1 1J) WIRI MIN SHOT In --4NF E SEC w }1E 1. I � � nEW VOMFE) E MIONS IM• WM150115,58 PRCI PI EI£Y.TIJHS NJ2: Mw E AVONS MATCH PVN n ATORs UNILSS OTEWSE NOTED. ®NORTH GRAPHIC SCALE 50 0 50 100 ISO Ewl SOME: t'. So' / v Ir j 7 SHENANDOAH P.U.D., FIRST FILING Sheet bj DRAINAGE CERTIFICATIONn III IT^s rr w c� r.rE P� Ilk 3