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Home My WebLink AboutBOARDWALK CROSSING, LOT 2, FILING 2 - PDP - 76-93B - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTEROSION CONTROL: This site is in a moderate to high rainfall erodibility zone and in moderate to high wind erodibility zone. Rainfall performance standard evaluation and effectiveness calculations were completed with the original report and have not changed. The required City Erosion Control Escrow Amount is $1424. This phase will construct a silt fence along the North and South property lines and on the East property line along the REI site and also along the West line of the existing West parking lot, and along South Mason Street. A gravel filter shall be placed around the existing area inlet in the said West parking lot and also around the area inlet on the South parking lot of the bank. A straw bale barrier shall be placed around the WQC structure in the grass island. ORD W L6 :QNG Adndm PNDrgRpt.doc February 27, 2004 ADDENDUM TO THE FINAL DRAINAGE AND EROSION CONTROL REPORT FOR LOTS I AND 2, BOARDWALK CROSSING FILING 2 EXISTING SITE: This site was originally designed in 1996 and the bank building and the parking lots on the West and South sides of the bank constructed in 1997. The developed site was constructed as the designed grading, drainage and erosion control plan show on Sheet 4 of 5 of the Approved Utility Plan. That sheet is included herein along with the original drainage report for reference. All lots and roads around this phase have been constructed. The site is bounded on the North by Boardwalk Avenue on the East by the bank's parking lot and REI; on the South by a 30-foot wide access road; and on the West by South Mason Street. Runoff from this site will be as originally designed which will be to route all runoff to the Stormwater System in Boardwalk Drive which was constructed for the McClelland / Mail Creek basin. Runoff from this site will be restricted to 0.5 c.f.s. per acre as allowed by this basin. The S.I.D. fee for this project was paid for at the time of the bank construction. DESIGN CRITERIA: The rational method will be used to determine the developed site initial and major storm runoff. Detention for the site will be based on the 100-year storm less the allowed release rate of 0.5 c.f.s. per acre. The mass diagram will be used to determine the required detention. All calculations and design consideration are in accordance with the City of Fort Collins Design Criteria Manual, except the historic 2-year storm will not be used for the release rate. DEVELOPED SITE: All proposed drainage patterns and subbasins remain the same as the original design. This phase is in Sub -basins A, D, and part of C. Sub -basins C and D are existing except for the North proposed building and cannot be changed with this project. Sub -basin A which includes offsite flows from Mason Street will be designed to include the City's new intensity data and extended detention. A grass island has been created for the extended detention. All runoff from this Phase 2 will be to the existing 30 inch R.C.P. storm drain in Boardwalk Drive which was constructed for the McClellands/Mail Creek Drainage Basin. This pipe system outfalls into Mail Creek. Storm Drainage facilities required for the Phase 2 will be the extension of the 12-inch A.D.S. pipe. The water quality control structure with the pond outlet restriction plate and also the extended detention restriction plate. The four -foot concrete pan to allow flow from South Mason Street and the sidewalk chase. BRDN'LK NINO Adn&nFNDrgRpt.doc February 27, 2004 Mr. Basil Harridan Stormwater Utilities City of Fort Collins P.O. Box 580 Fort Collins, CO 80522-0580 Dear Basil, We are proposing to develop Phase I1 of Lots 1 and 2, Boardwalk Crossing Filing 2. A bank building along with the parking lots West and also South of the building that we constructed in 1997. This phase will be to construct the South and North buildings and the parking lot between them along Mason Street. The buildings and parking lot have been revised to our present need. These changes however are minimal from the original design. This addendum is to update the original design calculations and erosion control methods to the City Current Standards. All design and calculations within this report are in compliance with the City of Fort Collins Strom Drainage Criteria and Construction Standards. If you have any questions or comments regarding this report, please let me know. Sincerely, �,a, ONO. r = W,"4' I- s Franklin D. ki*t ",I4M •y�� Unc=mt I v1- JS.JJ E-31 JS 4 „ I O p a s�pp N 4 L 6N WIN p ASPHALT OPAaTVCN tL. �r I ! cr• DO � q E G a p _Y 'r roes«r A. e rm• al vi fl l ary ern' a ox su noa•Iq aaan t [D Pvn ro a m xcgro .rtn cy .e. ,r ..•eagrm. .e- o:, I ..,.,.q.,,n arlla_........._...L................... _...r..........-- :..C[::C_::::::L::[:^C......_...-...................-..-.........--.....::JC'.__.............__....-...-....._.�`�.::`:::::::::^::L.- — BOARDWALK DRIVE �/ 0,✓ _fie JB O6 — — a r —-------_ — ..�. .... .... • rr mm T •j A r I al ._�b^L El ginn EN. .�I I ,J i ^ S i i e� .a•,•n /*� r� .1'4 I ry� I I I � � I I I I p e •,l ue 'i .. r 5 , ...................._....-........................................ ..... ky'I '.e eio.P•ee 'r— --' — — — �l I O ,• I M •- I wq F. — l •'q'ne b I 1 ✓ k J - Q ul r — I j dl�qm - 17 a — :r 3751 •nr N-JO67 T—'L Tironyd N/ L 9'Y9'16" Io00:nq aOfOle tr f.G I ,rrtn 6" wMe i ASPWLLT PATCH - Limits el .,reel c,., aro evPro^male. •nol M1mi1s v j to Ds �elermmeE m ,na lary Dr In• Y 0 3 L E Cfy E.--1 rm•ec1n1. ul r 6 e Dn ;n a weOn' .i,n g n g N- r,:r �, rar aoir aron VICINITY MAP SCALE - 1 "=2000' 9 owl NO FA it 1 r West Horrmnon t, ADDENDUM TO THE FINAL DRAINAGE AND EROSION CONTROL REPORT FOR LOTS 1 AND 2, BOARDWALK CROSSING, FILING 2 LOCATED IN THE MCCLELLANDS / MAIL CREEK DRAINAGE BASIN PREPARED FOR NADINE HOLTER FEBRUARY 27, 2004 PREPARED BY STEWART & ASSOCIATES, INC. P.O. BOX 429 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80522 TEL: 970.482.9331 FAX: 970.482.9382 a BRDtCLK XING AdndmFNDrgRpt.doc