Loading...
HomeMy WebLinkAboutDrainage Reports - 03/14/2008GPTY OF 1ORT $MMD� nE N 0 RT H E R N ADDRESS: PHONE: 970.221.4158 wEBSITE: ' ENGINEERING 200 S. College Ave. Suite 100 Fort Collins, CO80524 FAX:970.221.4159 w""northernengineering.com City of Ft. Collim ptar� ' Approved By City of Fort Collins Stormwater Utility ' 700 Wood Street Fort Collins, CO 80521 ' February 20, 2008 RE: Final Drainage Summary ' PVHS Medical Office Building Project No.:306-002.04 ' Dear Staff. This summary is in regards the proposed PVHS Medical Office, located at the southwest ' corner of Lemay Ave. and Garfield St. The project site is within lot 2 of the Lemay Subdivision Second Filing. The proposed office building will consist of the removal of ' an existing parking area for PVHS and a small existing building. With the proposed construction, a new parking lot and office building will be built. ' Previously, this site was the subject of the drainage report entitled "Drainage Report Letter for the Surgery Addition to the PVHS Lemay Campus" by Stantec, December 6, 2006. This report also covered the parking garage to be constructed adjacent to the proposed office building. In this report, downstream capacity in Lemay Ave. was analyzed, and it was determined that any impact to the hydraulic capacity of Lemay would be minimal resulting from the redevelopment of both the currently proposed office ' building site and the parking garage site. With the proposed drainage plan (see Attachment 1) for the office building and parking ' lot, overall historic drainage patterns will be maintained. Historically, a portion of the site drained into the storm line in Lemay Ave. in more minor events, and in a major storm event, it is apparent that flows would surcharge and surface flow into Garfield St. and ' then into Lemay Ave. The proposed drainage plan mimicks this pattern, with a portion of flows being captured and conveyed into the Lemay Ave. storm line. In a major event, proposed drainage will overflow into Lemay via a curb cut at the southeast corner of the t proposed parking lot. Based on the exhibits provided in Attachment 2, showing existing and proposed pervious areas, overall site imperviousness will decrease by roughly 390 square feet. Because of this, developed runoff rates will not exceed historic rates. Water quality treatment will be provided using a Stormceptor unit at the southeast corner of the site. All storm lines within the site will be routed through this unit prior to discharge into the Lemay Ave. storm line. Underground extended detention, and median extended detention were evaluated, but were determined to not be feasible for this site. It is noted that Attachment 3 contains the required erosion control cost opinion spreadsheet. Please feel free to contact me if you have any questions. Sincerely, NORTHERN ENGINEERING SERVICES, INC. Aaron Cvar, PE Senior Engineer P) Attachment l Drainage Exhibit Drainage Calculations I 1 [I H I [1 i i 1 1 1 1 1 i `1 [1 i ___-- _---- _--F- —_-- GARFIELD STREET VA On ✓✓E,y//%%%/�/q%��jj {p(�/%%�/�J�j� `/ r a I III ' ' � 1 � rl WT : � isOEWUR BAAjSE I ne .. I' ♦ , I LOT 2 INLET LEMAY SUBDIVISION SECOND FILING ♦ : /OR an 7F O O O O O O O O I I t CONCRETE P N / -�I"meS , PO CON PAN w _ 1 ! CRETE - ! j INLET -_ - /-------- • uR / / � : j : sT��� / � \•,` ;' / / ♦1 �� d1N SEW _ I � I I !---' WT y I i 2 t i CONCRETE CONONETE ER i �L , ♦' i ! 11 CHASE i > l' I ' I INLET I 6 I REM�LARE // // a CONOETEI PAN ! EDST INLAY / ,, oa < l 3F if ! ! � .-.I ISWAu��STWRLICWATEh ' ♦ 1 ____l p I .I . I -=I - I I -------------------- �—EMBT soMH I I SIDEWALK CHASE LEGEND PROPOSED CURB ! CUTTER OnTALL DRAINAGE BASIN LABEL — — — — EXISTING STORM SERER D1 OESION PONT B EMSTMC STONY DRAMRAGE INLET m P1IVOSD SIOb1 SENeI FLOW ARROW R WARD STCRJ CRNNAGE INIET BASIN BOINDARY Pgcreely BOROARY O —SF— SILT FENCE -A0M EMSIING CONTOUR ® ® VE11CLE TRICKING PAID —WWOa— PROPOSED CONTOUR ® WATRE SEDIMENT TPIP NOTES I. MS SEOYENT/E1M190N CONTROL PUN IS SCHOLADC IN NATURE AS SUCH, GRAPHICAL SYMBOLS MAY NDT SE TO SCARE. NON ARE THEY NECESSARILY SHOWN IN NOR "ACT LOCATION i MS SEOIYENT/EROSON CONTROL PLAN SERVES OAY AS A WOEUME TO THE CONTRACTOR SITA4WIC/P1IASNG 0111E BMPS SHOWN, CM THIS PUN IS EIWECTED. ADOIRONAL NRD/m OR1]ENT BMPS FIKM THOSE SHOWN MAY BE NECESSARY OUONC CON31111ILRO! AS REMIRED BY LOCAL AUTXOETEi IN NO LL WAY SHATHIS PLAN REPLACE TIE CONTRACTOtS ORIGARONS FOR PERMITTING (aW. STATE DISCHARGE PERMIT, ETC) OR COIPUANCE MITI GOVERNING AintoRi ES IT SHALL BE THE RESPONSIBILITY` OF THE CONTRACTOR (OR PERMIT HOLDER) TO ENSIRE SmatemT/IXOSON comiROL ME.ASIRES ARE PROPERLY IYPIFYp11m AND MANTAINED. O. SEE MOMS / SPECIFICATIONS ON SHEET C,2 — UTILITY NOTIF.=r CENTER OF OOLOTigp 'VI flw MN]2+10T w X NI aSW P�II�ZVn, WV,• MRjR� YYNYV R VCOGIOIU YOIq VIyIIT. (D 20 0 20 YO 50 Feet IN FEET ) I In. - 20 It. Cily of ForL Collins, Colorado UTILITY PLAN APPROVAL APPROVED UY ngineer �e1— CHECKED BY: water a W.atowater Utility —— CHECKED BY: Lormwe er utility CHECKED BY: ere & Rac,..U.. �afa CHECKED BY: ra c ngineer— CHECKEO BY: O A ie 9 �5 dig b g z a J J O u- ? Z Z J p fL DO Z N W O u- O J U QW i K! �WE W ITF O 0 Q O Z a /Q� LL Sheet DR1 S of 13 Sheets I [1 [1 1 11 1 11 1 1 i 1 1 1 1 1 1 1 1 1 0 N C N 9 U O O d m w o a o m m 0 M o r O U U �?� E O oQ U >. m Cl- m0 Z $ c m O ti d a c � m m rn m m rz �'E - m = m00000 N O CC 4 O Li m E N o m v rn �� �• � Q N F '00 O y .c 6 C m L 2 m y J @ .c W�E aW a 1 U) N O LL. Im C m 20 c.? m W�m 3 CN IN q 0000Wa N C W 0000 m O o,dC E E E E E LL @ m N N N N N Q mm IL dmmma� a O A •� 7n m m m m a rt @ 3 a 'o 'o 'o 'o 'D d > p 0 0 0 0 0 OJ Q m N @ N @ m @ N @ N @ CO Q O @mmmm U O O D N rc n� rnrnrnrnrn a O Qaa9 y. C m 0 0 0 0 0 o c YO 0 U UUUUU L W 4 O LL 3 Oo tltlq11 J W C N N q V W �!' !� m� o 0 0 0 0 N LU ¢ 0 r 3 N C m Q CP C @ m � cOONN V � V N @ �y., O U @ C N 0 CO C4 N NN CM O_ a G C m 7 N 2 G to m N fnY o :yyin _— p E m y ty c w d U m O m O U U) ¢ Z I 1 I 1 I 0 C; = � O O O O O 8 N Eui vi vi vim F = ~ E a z a z a z a z a z N Z O > O 0 O O p Z rl. O^ O O o 0 0 t U L'13 G O O o 0 0 m a N ISL d > � to 0 0 0 00 1 0 0 0 0 0 VJ Z g o o o o 0 OJ c ti Q c a a¢ a ~ E z z z— z W i U �>-800a.0 o 0 0 � Z-y V ge o00oa 4 ° O J W �'1K O 00 m N O C J ly O N o N Wm m o N �i o N N .- O ° rl �1 J Wp O- O b o N C ol= Q lOO W m N u J 0 C 0 y 0 N c N U N N M m m a M 0L o 11 p U00000 W N 0 > > -0 01 LJ F ¢ v ~O E# ; o a LL LL " U ci; 0 LL Q m N n a U 3 O Y W o LL m _ C a 6 c O O b j N TiTo I- 5 > > ° I 11 `o ir � c00000 B' ~ .E z z z z z 2 N O ' O p oU0 O a o 0 0 0 0 U r N O O O O O a N o a o 0 0 0 o O c f/f 0 0 0 0 0 VJ Z O �C o 0 0 0 0 d J c ~ E a z a z a z n a z W - oga zd' - o O k' N LL as o 0 o 0 o 0 0 o 0 Y O N J SW C L O O O N O Y J C N O [7 O N O ° m rn r n w__ N Yy�oo u S oow O u U a C N w N 00 0 Ol -0 01 U H ¢ v 3 m E U h M o 5 LL E IL O U 3 MO N° 0 LL A W LL _ o C7 3 cA _vim C 30 �= m 1-1 d II d O 0 mt Y O u°. O C7 F 1- 5>> p 11 -8���nry�om 3 gm 0 r 0 mCo 0 V N Y/ 0 `O m m rn m m O 0 F w Q di rl p �m m m m w a Cl O v LL 8 0 0 0 o g L U a' fr o m coo 0 coo 0 V W c 0 S E o 0 0 0 0 J3, ui ui vi ui iri Q w Q. O~ W c sE o 0 muiuiui 0 0 0 N 0 0 0 0 0 O a O O C U m � y C W FT U Q 0 O U p g N m a 0 a d cc 0 Attachment 2 Existing Vs. Developed Pervious Area Exhibits [I 1 I I 1 1 i Li (D E0 0 30 40 EO F..t ( IN FEET ) I ma'N= zD N. LEGEND V EX611N0 TIRE HYDRANT IXISIING WATER WAN AN 0 EXISTING WATER METER --Q EXISTING SEWER MAIN N LISTING WATER VKAE EXISTING STORM SEWER @i DOTING WATER MANHOLE —E— UNDERGROUND ELECTRIC Q COSMIC SEWER MANHOLE c— UNDERGROUND GAS UNES Om EXISTING SEWER CLEAHow —(TA— UNDER GROUND CABLE ONES ® DOGMAS um DRAINAGEVUET —T— UNDER GROUND TEIEPHONE LINES ® EbSTMG ELECTHXIA. AAULT EXISTING FENCE EXISTING ELECTRICAL METER UIXITY EASEMENR O EMITTING STREET UGHT — — — — PROPERTY BOUNDARY IT] EX6TNG NONE PEDFSTK -------48b--- EXISTING CONTOUR GM 0 EXISTING CAS METER Q EXISING CONTROL POINT © IX6TINC CABLE BOX O EXISIWG CONFER SHRUB a EXISTING SITE POSE � IXISTING CONFER BEE F DuMTNG SIGN B6 EXISTING DECIDUOUS SHRUS EXISNWG HC RAMP } { � ��- "MNG DESCIWOUS TREE NOTES: 1. THE SEE. TYPE AND IAM:MMXN OF ALL KNOWN UNDERGROUND UTIURS ARE AIPROXIMATE WHEN SHOWN ON THESE DRAWINGS. R SHA . BE THE RESPONSMI OF THE CONTRACTOR TO A FY THE EXISTENCE OF AL UNDERGROUND UIXITIES IN THE AREA OF THE WqB(. BEFORE COMMENCING NEW CONSIHUCIpM, THE CONTRACTOR S BE RESPONSIBLE FOR LOCATING All. UNDERGROUND UTIUIIES ANO SW BE RESPONSIBLE FOR Al UNNNOWN UNDERGROUND UTIUTIES. mPERVIOUS AREAS TOTAL PERVIOUS AREA = 16,290 SF 0$ ED pdW Ede= F =w W S ZW � B §�y A� 85 0 u) D In U > LL W tl a 0 a � U Z 0 H w cn X T W Sheet Of X Sheets I 1 [1 11 1 1 I 20 0 z0 40 60 Feet IN EET ) I 0= ]0 H. LEGEND PROPOSED WATER MAR G E)UMV G POST EXISTING VOTER MAIN H EXISTING SIGN PROPOSED SENIOR MAIN EOSTINC HIM RAMP —SS—© EXSTMG SEWER MAN d, EFSTWG CONTROL MW �— PROPOSED WATER SERVCE 0 EXISTING CONIFER SHRUB "ILS. V, PROPoSEO SENIOR SERVMX': :: F EXISTING CONIFER THEE 1V. N PROPOSED THRUST RESMAUNT 7 EXISTING DECII SHRUB w PRWOSEO GTE VALVE U EYSTWD DECIDUOUS TREE Alk PROPOSED FIRE NYdIWT IXTINC FENCE O PROPOSED FIRE SERWCE — — — UTILITY EASEMENT ® PROPOSED WATER SERVICE PROPERTY BOUNOALIY 5 < W � E%61MG FIRE HVpRNfT —i— U110ERGRWNO IEIIDHONE LINES O OUSTING WATER METER Q EXISTING PHONE PEDESTAL DO E)QWNG WATER VALVE Q E%SIIXG MEET LIGHT m EXSTING SENIOR CIEMIOW ® E%SFNG POWET VAULT EIOSIIIG ELECTRICAL MEIETR------------ E%SDNG STORY SENIOR E%ISTINO FAIR METER � PIIOPoSEO STORM SEWER I © EXISTING CABLE BOX ® DUSTING WORM DRAINAGE MILT --E— DUSTING UNOERCRWND ELECRRC ® PROPoSED WORM GPNNME INLET —G— IXISTNG UNDERGROUND GAS LINES —ETv— ENSTING UNDERGRWND CABLE LINES NOTES: ROW 1. THE SIZE TYPE AND LOCATION OF ALL KNOWN UNOERGRWNO UTILITIES ME MP MATE WHOL SHOE! dN 1116E R SWEL BE THE NESPE OF THE TO VEIN W THE ALL UNDERGROUNDAREA O M THE AREA OF ME WORN. BEFORE NDE RK.BEF RE OMMEMCM ILL UNONTRACTOR Q THE CONTACTOR SMALL CONSTE)USTERUCTION. MALL B IO EIRGROUND BE RESPONSIBLE IE FOR LOCATING ALL HNOERCROUNO NEW CONAND � SMALL A UTILITIES AND 9V1L BE RESPONSIBLE FOR AL UNEIOWN UN06IXIOUNp NMI6. z. THE RELOGTON M10/OR REMOVAL OF EXISTING TELECOM AND ELECTRIC VAULTS SHALL BE COYNETED BY THE SERVICE PRWYIER. COORDINATE ME SITE OEMOUTON ARGUING THESE J FAC-MES WITH THE APPROPRAN SERVICE PROVIDER D. UNITS OF STREr CUT ARE APPROXIMATE. FINAL LIMITS ARE TO BE OEIFAMUNEU IN THE FIEND BY THE CRY ENCMEEIMIC INSPECTOR, AL REPMRS M BE IN ACCORDANCE WITH CRY STREET REPAIR STAIDIADS, A. XCEL ENERGY MALL BE CONTACTED TO REMOVE ME IXSFING GAS MUNI TO ME BUILDING PRIOR TO ME OEMOITION OF THE WILDING. S. MWACT FORT COLLINS UTNR16 (070221.67110) TO COORDINATE ABMIOONYENT/REMOVA. I. AL WATER FITTINGS AND VALVES ARE GRAPHICALLY REPTESEWm ONLY AND ARE NOT TO SCALE O. CONTACTOR SHALL COORDINATE EXIDT LOCATIONS OF AL SURDMG UTILITIES (NET AND 0" WRH ARCHITECTURAL BUADMG PVMS, S. SANITARY SERVICE SMALL BE CONSTIUCIEG OF PVC SOR-M R. CONTRACTOR SHALL RUG OR CAP OPEN ENDS OF THE CKSONC S' STORY SEWER WHERE PORTIONS OF ME LINE ARE RENOhO. 10. ME M QMN TW CONNECTION WILL BE MADE DOWINSTPFAM OF ME PROPOSED 2-INCH RATER METER. SEE MC UTECNRAL DMMRRS. 11. ME STORY SEWER SYSTEM AS SHAM ON MIS ORAWING S PRIVATE AMID S TO BE MAINTAINED BY ME PROPERTY DEER. 12 ME ]-INCH DOMESTIC WATER SERICE OOWNSTRENL OF ME PROPOSED 3-INCH WINTER METER M THE BASE M. INCREASING THE WATER SERVICE M A 2-1/2 WON WATER SERVICE 5-FEET OOWNSfREAY OF THE WEER METER S AN ADO ALTERNATE. CWRpMAIE mM ME ARCHITECTURAL MA MCOH NKJL DMWINGS. 13. NOOR TO CDSIRUFTIDI ME CONTP)LTOTI SHALL LOCATE THE UTIOER4WgWE ELECTRI, CABLE AND PHONE LINES ALONG ME ENTIRE SOUTHERN PROPERTY LINE TO ENSURE MAT ME PLACEMENT OF PROPOSED LANNDSCAMINC GOES NOT CONFECT WITH ME MOVING UilU REFERENCE THE LANDSCAPE ORANRIGS FOR MORE MFIXIIM1pH. SHOULD A CONFLICT EXIST ME UTILITY COMPANY SNAIL BE C ACTED TO LOORdINIE THE RELOCATION OF THE MARRY. TOTAL PERVIOUS AREA = 16,676 SF PERVIOUS AREAS 1:1 V/ Q Z a W Q m U LL� °O a i OIX sW a. x m x SheetI 1 of 13 Sheets I ATTACHMENT 3 Erosion Control Cost Opinion Spreadsheet CITY OF FORT COLLINS, COLORADO SEDIMENT/EROSION CONTROL BEST MANAGEMENT PRACTICES (BMPs) COST OPINION SPREADSHEET Project Description: Poudre Valley Hospital Medical Office Building CITY RESEEDING COST Item Installation No. BMP ID Unit UnitCost Quantity Cost 1 Seeding and Mulching SM AC -723.0- 1.95 $1,409.85 SubtDtalCostl $1,409.85 Contingency (50%) $704.93 Totall $2,114.78 EROSION CONTROL MEASURES Item No. BMP ID Unit Installation Unit Cost Quantl Cost 1 Vehicle Tracking Control VTC EA $1,000.00 1 $1,000.00 2 Sediment Control Log (Wattle) SCL EA $300.00 6 $1,800.00 3 Silt Fence SF LF $3.00 930 $2,790.00 Subtotal Cost Contingency (50%) Total $5,590.00 $2,795.00 $8,385.00 Total Security $8,385.00