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HomeMy WebLinkAboutSUNOL ACRES (LOT 1, STROEBEL M.R.D.) - PDP - 31-97 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTi f STEWART&ASSOCIATES Consulting Engineers and Surveyors ' November 21, 1997 Mr. Basil Hamdan Storm Water Utility City of Fort Collins ' P.O. Box 580 Fort Collins, CO 80522 ' Dear Basil, ' The following is the erosion control cost estimate for Sunol Acres. ' 1. 170 L.F. Silt Fence @$3.00/Ft. $ 510.00 2. 3 Straw Bale Dikes @$3.00/Ft. $ 300.00 ' 3. Reseeding 0.80 Ac. @ $639/Ac. $ 511.00 ' The escrow will be 1.5 x $810 = $ 1,215.00 ' If you have any questions regarding this estimate, please call- ' Sincerely, ' Richard A. Rutherford, P.E. & L.S. ' rrc t ' James H. Stewart and Associates. Inc. 103 S. Meldrum Street P.O. Box 429 Ft. Collins, CO 80522 970/482-9331 Fax 970/482-9382 ClL) EFFECTIVENESS CALCULATIONS PROJECT: J u N o t. A c Ie Es STANDARD FORM B COMPLETED BY: 2 . A • R . DATE: Erosion Control C-Factor P-Factor Method Value Value Comment 8APC So II- /.0 b o ESTAgLtr4eD 6Ie,4S,1 0.06 /• 0 At pHALT � Conlc. O. 0/ /.00 G2Av5-wL RoAr> 0.0(0 /.0 .JTP-AW BALES /, 0 0.8 SILT F6NcE !• 0 O•SO (4;) 1BASINI (Ac) I CALCULATIONS -78,07o D•$-1 O,a?Ac. AJpA,/l - —©•ll 4c. BAR.ESOu.-0.1G/4c. �j7D C =Cm101 x0.//, + L/•OX 0•(L� _ 0.1L11 = 0.60 O,Z7 O•Z.1 FF = 76. 0 D, -Z 5,SB A( 6.eAvG& QOAD - O- Z_3 A c. ZAQc J•OIL. _ 0, 64Q�, ESTA81$HSD ioRASJ - 4.7 ul ' ° C-00•06•t-O'aA 0•(14•) + Co•Oex 4,71) 0• G�07 s sg o,1Z 7' f = 0. 80 x 0,50 = 0.40 E Fr- =E— (0-/Z A 640)3X /oo = 95 zolo SSsA�• EFF t�T)=CS'Z.Ox 1.17) 4-&s.z. X5.s0) 93.2YO ok 78,0 °/O ■ MARCH 1991 8-IS nFSi[:IJ CRITFRIA RAINFALL PERFORMANCE STANDARD EVALUATION I-------------- PROJECT:Sv .v {COMPLETED BY: iDEVELOPEDIERODI ISUBBASIN I ZO Mot --------------------- ------------------- --------------- i oL Ac z es STANDARD FORM A 2• R•.42. DATE: it j9lq7I -------------------------------------------------------I BILITYI Asb I Lsb I Ssb Lb I Sb I PS NE I (ac) (ft) I (%) . l(feet) I I (%) I a ERA7E 0-Z7At.i 39Sf,1 6.71,%i 1 1 1 i I� 6,egrE 5,564- 7Z0 Fri s 85a� i i i 70S i o,g9%i 7g,o%i I { { 1 � i i i i I f ------------- ------------- DI/SF-A:1989 ------------- ------------- DI/SF-A:1989 CONSTRUCTION SEQUENCE nFFIECT: Su ,U er _ A cue C-s STANDARD FORM C SEQUENCE FOR 19 38 ONLY COMPLETED BY: J2. A • e. DATE: // 1 / 4 / 4.7 In cats by use of a bar line or symbols when erosion control measures will be installed. Mar modifications to an approved schedule may require submitting a new schedule for ap oval by the City Engineer. I q 98 YEAR MONTH T I F I M I A M I U' I r I A .r O. OVERLOT GRADING j WI EROSION CONTROL ! 4oil Roughening erimeter Barrier additional Barriers i f egetative Methods i Soil Sealant �herI iA ALL EROSION CONTROL i � I i UCTURAL: Sediment Trap/Basin t 'Inlet Filters j i i Straw Barriers ! Silt Fence Barriers Sand Sags Bare Soil Preparation • I Contour Furrows i Terracing i Asphalt/Concrete Paving Other IGETATIVE: Permanent Seed Planting ! ,Mulching/Sealant Temporary Seed Planting Sod Installation 'FNettings/Mats/Blankets ! i Other I ' I MUCTURESs INSTALLED BY MAINTAINED BY LGITION/MULCHING CONTRACTOR ATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON �4) . SUNOL DETENTION POND HIGH WATER LINE I I 11 I I r-. I I I 1 I I VOL. = 1/3 (AREA ABOVE) (DIFFERENCE IN COUNTOUR ELEV.) 2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2) VOL. = DEPTH/3 (A +(AB) ^ .5 + B) FOR: Uniform Sides sec.(9.2) 3. HWL=(VOL.REO.—VOL.LOW CUML)*3/(AREA LOW+AREA HIGH+(low area*high area) ^.5) ORIFICE SIZING ORIGINAL DESIGN DATA 1.23 = Allowable Des. Release Rate cfs NOTE:1. VERT. PLATES WILL BE PLACED 20.50 = Flowline Orifice Elevation ft AT PIPE FLOWLINE 0.65 = Orifice Coefficient Cd 1.50 = Avaliable Driving Head ft VERT. CIRCULAR PLATE VERT. SQUARE PLATE r-, STE V VAR 9&SSOCIATES 103 S. ME9331 LDRUM,FAX FORT gOLLINS, CO 86521 Consulting Engineers and Surveyors By: Id, Date: r-r, 170 /9t Client: 1P, r M R 2- b fr- o rT Sheet No. of Project: Su u n �4 c, r-F c Subject: M a r r 14 eo . a m ' 0 /0 z0 30 40 50 Go 70 80 q 0 I z 0 Ti M 6 (H, v,} r STEWART&&SSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: Date: oe--r. /:Z/qg Clierit: k--'tr-JqAeT> Fr-ej7-r Sheet No. -7 of_ Project: S u m ip t A c, e s:c Subject: b a I//=/ r> E V AJ 0 Fr F= C A LC, U L, .4 -rl 1) JL)—r 1!-0] 0.-7- -4c.- -14 + JAI 1 -365 8 Jk i'Ah -T T-- T-L b 6 '-3! 1, x 3—IN-15-11-15 a -1 'A - ----- — 11 r 7---T sL STEWART&ASSOCIATES Consulting Engineers and Surveyors I I 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: E A: t2, —Date: 1-7,19 7 Clierit: fc,,pr7- Sheet No. _j�o_ of — Project: SU "a (_ A r, p- e s Subject: EVUor-i= CA4_CU1_A7_1e)1Uf 77 F STEWART&ASSOCIATES 103 S. MELDR1FAXUM, FORT COLLINS, CO 80521 Consulting Engineers and Surveyors PH. 482-933482-9382 By: 2 14 /e Date: Or -r. 12. /-?,g Client: 1Z, H r-, Se-- o-r Sheet No. of 7- 67 Project: SuAi a r P— 6 s Subject: r -r6 ie 1 2 u A-) 0 F oo, r- z- 4 -rl o AJ A J 0 1 L- L'A -1"0- x-,-O."407 -06 0 -7-614 .. =-`0 3 x G TX -Z,-23 5-x- L 0,2, 0.4. -J+,ii 67�- 10 I-Isl x 01 7-/, C" F, J. C, 100Y?"Z X-`& lo X-4-, 7 X -0 Z-77 A5 Z� �- 9S, ' p L I J --------- - --- - 7-; —T p I I STEWART&kSSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: Date: _6LTL2,L�59 7 Clierit: re,r) T-7- Sheet No. 4- of Project: So AJO It A C_ P_ F.- S Subject: AJ t9 4 C_ u L-,L%;, -r In A.' S —7-----" —7 7 Ac-, 4 4- o z 51, A r, 2____4- -7 _p_. (A A 4_4 . ....... Z_ - ---- ------ k' F-7, -3 1. -L m _7 'Pf iS P K 'ZI 8 2: --c"S. 6, 0. C_ F 's L 6,0AM )�(__3 .0 X__5"YB H! ...... 7j -J (3) VICINITY MAP SCALE - 1 "=1000' East Dmke o 3 ep Harmony Road 'a a l 1,lEast Horsetooth Road SITE It is planned to provide on site detention for D.B.-2 in the Northeast comer of Sunol Acres. A drainage easement will be dedicated on part of Lots 3 and 4 for the detention pond. A variance ' is requested to allow detention on residential lots. The variance is justified due to the large area of the lots, and the low volume of detention required. A drainage easement has been acquired from the owners of Lots 2 and 4, Strobel M.RD. to carry the storm water from the pond, East to the Fossil Creek Inlet Ditch at the historic rate of 1.23 cubic feet per second. The detention volume required is 15,804 cubic feet. The site has a good ground cover of alfalfa that will not have over lot grading done on the entire site. Charlie Lane is an existing gravel road that will have curb and gutter constructed and then be paved. Straw bale dikes will be installed in the existing borrow ditches at the East end of Sunol Acres. A straw bale dike will also placed at the outlet of the detention pond during ' construction of the pond. The pond will be reseeded after the grading is completed for the pond. The grading plan and the storm water runoff calculations and the erosion control calculations ' are enclosed as a part of this report. This drainage report and the design of the drainage system are in compliance with the City of ' Fort Collins Storm Drainage specifications and criteria. If you have any questions regarding this report, please call. ' Sincerely, 5 0 2 8 Richard A. Rutherford, P.E. & L.S. :A ffc 11 1 STEWART&ASSOCIATES Consulting Engineers and Surveyors ' November 21, 1997 Mr. Basil Hamdan Storm Water Utility City of Fort Collins P.O. Box 580 Fort Collins, CO 80522 Dear Basil, ' The following is the Final Drainage Report for Sunol Acres which is situate in the Northwest 1/4 of Section 33, Township 7 North, Range 68 West of the Sixth P.M., City of Fort Collins, ' County of Larimer, State of Colorado. The site contains 5.1616 acres and is a replat of Lot 1 Strobel M.RD. The site will be divided ' into 4 large lots. It is zoned Urban Estate. Lot 1 has an existing residence and Lots 2 thm 4 will have single family residences constructed. ' The site is bounded on the West by County Road 9, on the North by two metes and bounds large lots that are not in the City of Fort Collins, on the East by Lot 2, Strobel M.R-D. which is ' also not in the City and on the South by Charlie Lane which is annexed but has not been hard surfaced. The Christ Fellowship Church Subdivision, that is being reviewed by the City of Fort Collins, is on the South side of Charlie Lane. ' The site slopes from the Southwest comer to the Northeast comer at an approximate slope of 0.8%. The ground cover of the site is alfalfa except for the yard and gravel driveway of Lot 1. The Lot 1 ground cover will not be disturbed. The ground cover on Lots 2 thm 4 will not be totally disturbed in order to construct the residences due to the large area of the lots. ' The historic site has two sub -basins. H.B.-1 is the East half of County Road 9 which drains into a small borrow ditch which flows North to West Horsetooth Road. H.B.-2 is the remainder of the site. It sheet flows to the Northeast corner of the site and then on Northeasterly to the ' Fossil Creek Reservoir Inlet Ditch. The developed site is also divided into two sub -basins. D.B.-1 is also the paved part of the County Road 9 right-of-way which will drain North in the proposed curb and gutter to the existing borrow ditch on the property lying North of Sunol Acres. The runoff continues to flow North to Horsetooth Road. D.B.-2 is the remainder of the site. The area of D.B.-1 is 0.27 acres ' and the area of D.B.-2 is 5.58 acres. James H. Stewart and Associates, Inc. 103 S. Meldrum Street P.O. Box 429 Ft. Collins, CO 80522 970/482-9331 Fax 970/482-9382 1 1 1 1 Table of Contents 1-2 Text of report 3 Vicinity Map 4-7 Runoff Calculations 8 Detention Pond Mass Diagram 9 Detention Pond Volume & Orifice Plate 10 - 12 Erosion Control Calculation Pocket Grading, Drainage and Erosion Control Plans 1 1 1 1 FINAL DRAINAGE REPORT FOR SUNOL ACRES FOX MEADOWS BASIN PREPARED FOR RICHARD AND MICHELLE SCOTT NOVEMBER 219 1997 PREPARED BY STEWART & ASSOCIATES, INC. 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 970/482-9331