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HomeMy WebLinkAbout401 WEST MOUNTAIN AVENUE - PDP - 29-98 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTiSTEWART&ASSOCIATES 103 PH. S. MEL9331DRUM,FAX FORT COLLINS, CO 80521 Consulting Engineers and Surveyors By: J TZ Date: C I '7e Client: to h l— F e Sheet No. of Project: 4-01 U4J AA 0 un Tct i rt Subject: '5 for L^./ Cn-�-e r 1:7U n o - Arect- g750 _ -5 F =. 0. 22-3e Ac . C= U, 1? 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I. Fos ..•'� ]2 n.au ma. d M ]� 15 SO SE O/•m/ /1." 9 r- imm ®X,.ig.,©im I-16'` I. AVENUE M-102 12 I-15j -: N In W to .. Y•OFr' - - l COUNTY , COURTHOUSE 1 1-120 .-,.•— .I-39 M-IOs �}Y-100 I-1 4 . WEST d// OAK Y-loe STREET . .. -- r I�3s L7 1. m. � W r.rY � B/ O N SVGS. p BLDG. O CCONDO p Sl31 3 I t 309 O 3 w� J ci + O u I SAV/N M (9> BLD e 9/ O O CONDO pp --------------- © O � s r , c) I -121 I -I xe 7 1423 1 411 I .oy a . O 316 / 1-129 1 3431 141994 CD' 1-131 a I© I 4•ao $ 1-13 ao Vo - i0 no/. -- o O. o tip\ O« N W w-Ir —1— w-an 82 N 0 rFe/ Wc II --�— i _ CD O f Ary AL A O N N "I tiF M'44/ ON, 1 N N N ryal lole n I.ar. arl N N N N N l r 1 ~i 5 O• w 2 412 404 +-Q n /I-0alI 320 1 316 �N I R 4281424 ♦16 M M 225 1 215 I : 203 �7 I .1 O 1 •I I S iO216 = I i - � 200 M +o - - I-33 r- - I-21S I-221 M-zu OLIVE Y - 213 •' STREET ., .N - 210 WEST I-z3o I-34 I-22 = zap i m 3 a. �423 1 4 gg I A\\saJ \\ reO U,S (� © 11 O•ou n-ae/ ©- 6(',a� . lf.00 S 1z ] ! 01 EROSION CONTROL This site is small with restricted room for construction, so the use of silt fences or straw bales is not practical. Demolition of the existing building and of pavement on the east portion of the site will be required prior to construction of the new building foundation and basement. The existing pavement on the west portion of the lot and the existing sidewalks and curbs on Mountain Avenue and Meldrum Street should be maintained in place until the foundation and exterior building work is completed, so that there is not bare soil in the streets. Also the existing walks should provide a good platform for equipment ,and scaffolding during the building construction. Gravel filters should be placed around the two existing catch basins on Mountain and Meldrum. All excavated material should be hauled away immediately and not stockpiled on the site. Wind erosion ismot a factor on this site due to its small size and the surrounding structures. The erosion control collateral for this project will be the minimum $1,000.00. r EXISTING SITE CONDITIONS The 401 West Mountain site is located at the southwest comer of West Mountain Avenue and South Meldrum Street. The site is the North 1/2 of Lot 7 and all of Lot 8 in Block 81, EXCEPT the West 60.00 feet thereof. The site is 130.00 feet east and west along Mountain Ave. and 75.00 feet north and south along Meldrum Street,. and has a net area of 9750 square feet or 0.2238 acres. The existing site is 100 percent impervious, consisting of a service station building and asphalt and concrete pavement. There is an existing storm drain running to the north in Meldrum Street, and there are two existing catch basins at the southwest comer of Mountain Avenue and Meldrum Street. The existing drainage patterns on the site are to the north and east, to Mountain Avenue and Meldmm Street. OFFSITE DRAINAGE At the present time, there are no offsite flows onto the site. There is an existing block retaining wall along the south and west sides of the site which has historically blocked all runoff from the south or west. This wall will be maintained so that the offsite drainage patterns will be maintained as they have been historically. The property to the south has roof downspouts on the west side of the building and the parking lot to the west of the building drains west to the alley, so these are no flows from the south directed toward the 401 W. Mountain site. 417 West Mountain Avenue, which is the property located to the west of the site has a roof downspout on the east side of the building, but the runoff from this downspout is directed into a landscaped area on the 417 site and eventually drains Southerly to the parking lot south of 417. This parking lot drains west to the alley. PROPOSED DEVELOPED CONDITIONS The development at 401 West Mountain Avenue will include a building on the east 6000 square feet of the site and a paved parking lot for 7 cars on the west 3750 square feet of the site. The runoff from the east 3000 square feet of the building will be carried through interior roof drains and a pipe in Meldrum Street to the existing storm drain system in Meldmin Street. The west 3000 square feet of the building and the parking lot will drain north, on the surface, to West Mountain Avenue. This is approximately the same drainage pattern, with the same flow quantities, that has happened historically. The flow quantities from the east and west portions of the site are shown on the calculation sheets included in this report. The two existing catch basins at the southwest comer of the Mountain and Meldrum intersection will need to be relocated to fit the proposed new curb relocations. This relocation construction is shown on the plan included in the pocket of this report. VICINITY MAP SCALE - 1"=1000' Coo'so �l�p Cherry Street r p 0 �o Map Streetsr 00 r � 0 c a a La Pa e Aven e SITE O�Q TI Mounlain Aven rr„ o� r m Ook Street m ID c m H O o u' o Olive zffroer m 0 3 A2 m m 3 o t Q Mognol o Street o U M /berry treet a m o u o o � U) ul H Myrtle Street m o °0, lb o c y D CD E a 3 Lourell Street m TABLE OF CONTENTS Vicinity Map 2-3 Text of Report 4 Map of Storm Drains in the Area 5 Map of Old Town Basin 6 Calculation of Site Runoff Pocket Drainage Plan 4 STEWART&ASSOCIATES Consulting Engineers and Surveyors June 26, 1998 Mr. Basil Hamdan Storm Water Utility City of Fort Collins P.O. Box 580 Fort Collins, CO 80522-0580 Dear Basil, We have prepared the following drainage and erosion control report for the proposed construction on a site in the Old Town Drainage Basin located at 401 West Mountain Avenue. This site consists of 9750 square feet and was originally a Sinclair gas station, but for the past 20 or more years it has been used .as an auto repair shop. The site has historically been 100 percent impervious, therefore, we do not propose any detention on the site. The site is within the Old Town Basin, but it is not within a designated 100 year flood plain. The proposed site will be 100 percent impervious, but there will be some additional landscaping in the street scape over that which now exists. This report complies with the City of Fort Collins Storm Drainage and Erosion Control criteria. There have been no water quality measures proposed, because the runoff from the proposed site will have less pollutants than that from the existing site which has historically had a large amount of auto traffic as a gas station and as an auto repair site. Sincerely, h1. Robinson, P.E. & L.S. Phillip meh 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 DRAINAGE AND EROSION CONTROL REPORT FOR 401 WEST MOUNTAIN AVENUE LOCATED IN THE OLD TOWN DRAINAGE BASIN PREPARED FOR VAUGHT-FRYE ARCHITECTS PREPARED JUNE 269 1998 PREPARED BY STEWART & ASSOCIATES 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80522 TEL: 970-482-9331 FAX.-970-482-9382 G