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Home My WebLink AboutSOUTH FORT COLLINS VETERINARY CENTER PUD FINAL - 46 91A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT(' e FINAL STORM DRAINAGE AND EROSION CONTROL REPORT FOR SOUTH FORT COLLINS VETERINARY CENTER January 6. 1992 STEWART & ASSOCIATES. INC. 214 North.Howes Street Fort Collins. Colorado 80521 STEWART&ASSOCIATES Consulting Engineers and Surveyors January 6, 1992 Mr. Glen Schlueter Storm Drainage Utility City of Fort Collins P.O. Box 580 Fort Collins, Colorado 80522-0580 Dear Glen: This is the Final Storm Drainage and Erosion Control Report for South Fort Collins Veterinary Center proposed for Lot 7, Creger Plaza. It is located on the West side of South Mason Street approximately one —quarter mile South of Horsetooth Road, and the address is 38.01 South Mason Street. Storm Drainage The site is in the Mail Creek Drainage Basin. The site has 1.64 acres and was originally a low area that could not be drained. When Creger Plaza was developed in 1979 and South Mason Street was built, a 14"x23" oval storm drain was constructed. The storm drain was sized to carry the runoff after it has been detained on the site. There is an existing 15—inch concrete pipe stubbed into the Southeast corner of Lot 7 for the discharge from the detention pond. There has been some fill material placed on Lot 7, and the remainder of _the lot is lower than the discharge pipe. Dr. Rainey Corbyn is proposing to construct a veterinary hospital and dog and cat boarding facilities on the lot. The enclosed grading plan depicts the proposed building and boarding facilities. A detention/retention pond is proposed in the southern portion of the lot. The detention pond has a required volume of 10,260 cubic feet; de -term ned - by -the- mass -di agram. The bottom of the pond will remain at elevation 5030 which is two feet lower than the outlet pipe invert. The high water line of the pond will be 5034; therefore, the detention capacity is from the 5032 contour to the 5034 contour and is 16,168 cubic feet. A restriction plate will be placed on the outlet pipe to restrict the discharge to 0.93 cubic feet per second. The owner and the landscape architect have developed a landscape plan using xeriscape plant materials in the filled portion of the lot and leaving the pond in a natural state using wetland vegetation such as sages, rushes and reeds. The dog and cat boarding facilities are both indoor and outdoor but are completely covered by roof. The floor of that -entire area slopes to a trench drain that discharges into the sanitary sewer. There will be no runoff from the boarding facility entering the storm water swales and the pond. Therefore, there will not be a storm water quality issue. James H. Stewart and Associates, Inc. 214 N. Howes Street P.O. Box 429 Ft. Collins, CO 80522 303/482-9331 Mr, Glen Schlueter South Fort Collins Veterinary Center January 6, 1992 Page 2- Erosion Control The site has been partially filled, with the remaining area left at the original pond elevation. The part of the site at the original pond elevation has little existing ground cover. The filled portion has moderate ground cover. The prevailing winds are from the west, and the site is protected by the Burlington Northern Railroad which is seven feet above the bottom of the pond. There is no storm drainage flowing onto this site. 'The borrow area on the railroad property catches any flow along the railroad and has existing wetland plants. Mason Street has been raised to approximately five feet above the bottom of the pond. The development of the site will begin with imported fill to the site for -the building and parking lot areas. The building foundation will then begin which will break up the -wind erosion. The parking area grading and curb installation will follow the building construction. Water erosion will be mitigated by the retention portion of the pond acting as a permanent sedimentation trap. As discussed previously, the lower two feet of the pond will remain below the existing discharge pipe. A rock filter will not be needed at the entrance to the existing dis— charge pipe because of the sedimentation trap being two feet lower. This will allow the Mason Street water to continue to flow through the walk under drain and into the discharge pipe. Care will be taken during the importation of the fill to clean up mud tracked onto the Mason Street pavement. The finished site will have several forms of ground cover. Part of the landscaping will be xeriscape plant materials, part will be sod and part wi-l-l—be—wetland vegetation. The rest of the site will be hardsurfaced._ The drainage calculations, erosion control calculations, and the grading and drainage plan are enclosed as a part of this report. If you have any questions regarding this preliminary report, please call. Sincerely, Richard A. Rutherford, P.�Eet L.S. President jrr enclosures SUBJECT_LQ'r—!�=CZJ=Bi—��fi7.r$__. BY— t A1� --_. DATE ,5_S€e��2__Sr�D��lu� SHEL. ,JO.—_----- _CA S.S�Q_4.&T1AILS_ ---- ----- RROJECTNO.------_--- Nevi'A'Pei a14 !_/+(a 4-• Ac....�- r I _�. ',C��oss;.AeER I M;PEa.vioui i:�R6A � � 0,7$?,h�I �47•�.% IA2SA ! AL,i 1 i 1D E�/: t✓` I C/ xi 0,I4TGl � -K,..(;OrZ,h O,SZ.4.� _�. i `i _ I t HISr //7f H !ST vl Z �/ e1 = O. 2 k /• r4Z. X /• (o = ..0 4-% G• F.J, H11L Q.j°y,� = 0•Z X i /• (o.�' ..0..8� G.F,J. t Tc = Zy:144,. HlSr. Q looyR = /LSXO,L,I4;",S X' /.'(�:y-.c /,)4 c.F.S;- NE7�'REA� DEv. Te I. 87 _ ZI pA w. DEv,,?1 G•F,S. 1 x,3104111,.c.F3. _.. _. t"G= ISM/N• DES ;C�roc ye. = /•ZJ x. D,s.B k 6•'9S x /.G 4 = 7.07 c• F.s, MASON ,ST2EET Ar, EA - 0' 2-3 Ac.. SM j'ekylovJ! r�i EA = O, ; 8/,'7 ° 19 Pl=evl0✓J. AeEA� = 0,04;Ac• DBv, C k!0. / I DEv• /• 87 (/.l -O. 8s)' qo yLj p. SG J OMPUTATIONS Stewart & Associates, Inc. 214 N. Howes St.. Ft. Collins, CO 80521 (303) 482-9331 By: 2. A& Date tau• / i 111? Client: Dp-' Cop M)JAJ Sheet No._5- of I Chkd By: - Date Project: SovTAl )'E"o9r Goi-Llms V E 7'EP./NA re•y ENfE Subject �-roPam. �r—AI A&P, CJQLGVLAT/DNS - Z7 eA M AS-OAJ ST/iECT RumoFF �cour•� DEv. Qzye- O•BSx .Z•5J<...D•Z3 =1 pJ 9i GJ�t D ev. Q 10yR, o. SS'x ¢ ,a X o' 3 _ . Q F S. Tr,- 4-Avv• Dev• Qtoo Ye , /.LS x O•as K 7.2, x 0,2,3'= hl 6 C.• Fr. ' Ili ALk- owAac.E RELEASE ATE OP, M Afo,N :SrzEET,.rTOP�M DR -A IN Is D.S /4c.;✓E • � �, i _ >Z X 0.5 — 93 �.F1. • G 2ors >4 P-EA = /. g-7 Ac, IMPEevrOUJ AP-eA ' �•%'7Ac'. ' IJ`—/•9�0 PeP•vrovi' ,/}.reEA = 0.90 Ac: I i 48,1 G = �x o•s, y� -t(o. z x o. 48,) o• Z ,I ALLOW. Q OJ _V X,a• 9'3 c �J =1 • �n . R Fs�f F.i_ SUBJECTs9 ----• BY— �---- DATE �p1Z�L9/ �� S�r93t12�—FOPS-t+2---� B�L �Iz4rePdCt SHEL- AO. — PROJECT NO.-- -- T/nnE �' G A l .:. GFJ VOLUME; �? ! j`'. t tsx:D rz.xc47, i �, i= f I GZG4 /D.? ?Z!,,� ;/.¢s:: r. ,� .' �,lD::'Q•4- zo s t i I ' ; 7sa 9 0 f3 .I , ' 40' 3,3'_I °.. _i i .r .� ! . �'5�06 1Lr19z S01 ! 3 A_:! f , 'i -' i I I . i �.4.35 13,OED Gv t..o Z• ( I .. ; i j..i ;.. j 3.77. 13,S�L 90 J•37, r , ? i Z,.71 63 4- 45 180 J 0s; i I ! ! ' . i .SZ IG�q } r ;.: i � - tg, 000 ` - l a,o0o 14,000 IL ' i2,000 I o, coo > ; goo tu a3 L Fs. I j D AF�6 D�Pg4 ¢oop ( Q L�90 ?,,ODD O to Zo 30 40 So �o 90 IZO t8o ` T, A. dlC r AA I Al. 1 RAINFALL PERFORMANCE STANDARD EVALUATION -----------------------------------------=--------------------------- PROJECT: SOUTH FoZr Coc1-i,vs VETaP-1AJA2y CeaTsp-STANDARD FORM A `COMPLETED BY: )e, A. P uTHe2t=opr 'DATE: JA.J.c,��yL ------------ --=------------------------------------------------------- IDEVELOPEDIERODIBILITY Asb Lsb I Ssb Lb Sb PS ISUBBASIN ZONE (ac)-(ft) L (o) - - (feet) (;) (%) --------------------------------- ----- lBasin, A" Moa6�are� /.87A� Scp /.0 5-60 /.o I 77, ---------------------------------------------------------------------� HDI/SF-A:1989 JAOIiARY 1991 (7 ) 8-18 DESIGN CR:IrRr_. EFFECTIVENESS CALCULATIONS I--------------------------------------------=-------------------------I (PROJECT: SOUTH FORT C0LLI/UX Veree1.v.4,eyCc-,vre- STANDARD FORM B i II COMPLETED BY: _ k A, lZvTy - .FoeA DATE: JAu 41 /qy� Erosion Control C-Factor P-Factor Method Value .. Value Comment _ ------------------------------------------- BAZE 101t- /.0 -------- STREETJUTAltS D•01 /•I) SEU/M0.VT.4r/O,V BAT/V /. D BASE MATEVAL 0.1 EX/ST. 6rrovv, ccve✓REM4tlj 0.08 ---------------------- ------------ ---------- MAJORI PS. SUB.( AREA I . -------------------- BASIN( (;) (BASIN (Ac) CALCULATIONS ----- ----- I ------ I ------ =----------------- ------------------- !� 177•8 1 I /•87411 STP-C&T WALE = 0 /y 4c, BARE Co►OJ,ub 0,74 Ac. 1 BvIC.D/,v O, 39Ac. 1 BASED PA12,1c,A14ARE4 = 0,37A&. - i �YlST.GlZtivNDt�OVE1S.�EMAgVe0,1$ I W E IGHTED G-FAcro,e c I (6.01 X 0.19)� II i I r 1,11.7 0.42. WE)GHTED h FAc.rop- = 0,so (a42 x 0.5) X/oU = 7q,0 �o ---------------------------------------------------------------------- DI/SF-B:1989 :-] 1 CONSTRUCTION SEQUENCE PROJECT: F7 COLL1ti/I VFT6R-'A)A STANDARD FORM C SEQUENCE.FOR 19 _J2.,- ONLY COMPLETED BY: A,(?, DATE: JAQ, 4 19 l Indicate by use of a bar line or symbols when erosion control measures will be installed. Major modifications to an approved schedule may require submitting a new .schedule for approval by the City Engineer. YEAR MONTH ----------------------------I OVERLOT GRADING WIND EROSION CONTROL Soil Roughing Perimeter Barrier Additional Barriers Vegetative Methods Soil Sealant Other Eva-DW& RAINFALL EROSION CONTROL STRUCTURAL: Sediment Trap/Basin Inlet Filters Straw Barriers Silt Fence Barriers Sand Bags Bare Soil Preparation Contour Furrows Terracing Asphalt/Concrete Paving Other 'Boil. 01/4 B AS6 MATeIZAL VEGETATIVE: Permanent Seed Planting Mulching/Sealant_,_ _ _ Temporary Seed Planting Sod Installation Nettinas/Mats/Blankets Other J I FI MIArlit1%J IJ IA Is 101AJ ----------------------------------------------------------- STRUCTURES: INSTALLED BY MAINTAINED BY VEGETATION/MULCHING CONTRACTOR DATE SUBMITTED JA v G, l9R z HDI/SF-C:1989 APPROVED BY CITY OF FORT COLLINS ON JANU,ALRi 1991 .Cq) 8-20 DESIGN CRITERI?.