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HomeMy WebLinkAboutDrainage Reports - 06/10/2011HuCalibre City Of Fi-Collins Feroad Plan June 6, 2011 Approved By! City of Fort Collins Utilities Date 6' —1 Q �.� PO Box 580 Fort Collins, CO 80522 Re: BBVA Compass Bank Drainage Conformance& Erosion Control Front Range Village, Lot 2. To whom it may concern, The purpose of this letter is to illustrate that the development of the above mentioned lot is in general conformance with The Final Drainage and Erosion Control Study for Front Range Village prepared by Stantec Consulting Inc. dated February 2007 and to outline the proposed erosion control measures for the site. Drainage: The proposed development is represented in Basin 100 with flows accounted for at Design point 100 of the referenced report. The proposed development's drainage infrastructure will consist of: 1 - 5' Storm Drain Manhole 2 - Type 13 Combination Inlets 10 - Nyoplast Drains 4" - HDPE 6" - HDPE 10" - HDPE 15" - RCP 24" -,RCP 30" - RCP The proposed system will route flows to DP100 of the referenced report. DP100 is an existing CDOT Type D Inlet. Onsite inlet and pipe sizing calculations are being provided for your review. Erosion Control: Proposed erosion and sediment control measures include installation/construction of: a vehicle tracking control pad, silt fence, concrete washout and inlet protections. In addition, other proposed mitigation methods include inspection and maintenance procedures. A brief description of each planned erosion and sediment control measure is as follows. Vehicle Tracking Control: Provided at the access point off of site. Silt Fence: Silt Fence will be placed, at a minimum, down gradient of exposed areas, as required.. Silt fence will also be placed down gradient of any soil stockpile areas. Inlet Protection: Gravel filter will be placed in front and behind new inlets and existing inlets that capture runoff from Lot 2 to reduce sediment conveyed into the storm sewer system. PA1313VA CB FWDRAINAGEIDRAINAGE CONFORMANCE.docs Caldxe Engineeru-q hw- 8201 Southpark Lane, Suke 200 Littleton, CO 80120 (303) 7304434 mYw..calilxeenyuieerirx�.com MI,Calibre Concrete Washout Areas: A concrete washout area is a shallow excavation with a small perimeter berm to isolate concrete truck washout operations. Signs shall be placed at the construction entrance, at the washout area, and elsewhere as necessary to clearly indicate the location of the concrete washout area to operators of concrete trucks and pump rigs. The containment area is to be bermed so that the wash water is totally contained. Water discharged into the containment area is allowed to infiltrate or evaporate. The dried cement waste shall be removed and properly disposed of. Inspect weekly and during and after any storm event. The concrete washout area shall be repaired and enlarged or cleanout out as necessary to maintain capacity for washed concrete. Proposed sequence of major construction and erosion and sediment control activities are listed below: • The anticipated start date is Spring 2011 • The majority of the site will be overlot graded at time. • Silt fence (SF) and/or any other necessary BMPs shall be established to control sediment running offsite. • Prior to clearing and grubbing, vehicle tracking control (VTC) and silt fence (SF) will be placed on the site. Offsite inlet protection (IP) shall be placed at this time. • After clearing and grubbing operations reach completion a concrete washout (CWA) will be placed on the site. • , The storm sewer shall be construction with inlet protection (IP) measures established. • After all concrete work has finished, the concrete washout area shall be removed. • Permanent stabilization will be accomplished at the completion of the buildings, paving and hardscape implementation. • Upon proper stabilization by the seeding methods and post -stabilization of the site, the silt fence and inlet protection can be removed. • The anticipated completion date is Fall 2011. I hereby state that this drainage conformance letter and calculations for the Front Range BBVA Compass Bank was prepared by me (or under my direct supervision) in accordance with the provisions of the City of Fort Collins Strom Drainage Design Criteria and Construction Standards for the owners. Todd Johnson, P.E V.P. Director of Professionals Services CALIBRE ENGINEERING, INC. II P:ABBVAC I'IZ\DItAINAGGADRAINAGE CONI'ORMANCE.doex \--4942 r `4943,- — —-- — — — —-—— — — —--I-L— - z LOT 1 ``R9Re 1.97 0.85 0 V, C VIQ V, 0.34 0.85 0.9 ,i 4945 i i II 0.5 0.85 i 911 8 p�j /1 -` L--- o \\ -4g4 a Y.:• U Oct --- m ----- -- 0.9 5010.21 - --- _ _ --- _--- _-`''------- 4951 a —4950- —4950— — — — - - � -�' Of0. =--__—=___-------4949---.4948--_ d ----_ -'''"' NORTH lij"'Calibre COMPASS BANK �R Calibre EngineeringInc. DRAINAGE EXHIBIT i 8201 Southpark Lane, Unit200 SCALE: V = 40' Littleton, w .mlDe-engineering.(mwn 303) 7.iU0A34 DRAINAGE CONFORMANCE DATE: MAY2011 OConstruction Management Civil Engineering Surveying n > LO Un U) n O � tC O v LL G m o 0> 0 rn 0 OR 0 V > m m m m d w 0 0 0 0 O v F Q e o o ui 0 LO 0 if 0 U7 Q 0 Cr) 01 0) U. 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