Board of Adjustment Agenda and Packet 2015 05 20

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L cityof Louisville COLORADO • SINCE 1878 April 2, 2015 IDepartment of Public Works Scott Robinson City of Louisville Planning Department 749 Main St. Louisville, Colorado 80027 Subject: 611 Front St. — Parking Lot Expansion Floodplain Development Permit Application Dear Scott, On behalf of the City of Louisville, I have reviewed the existing FEMA floodplain mapping for the site to determine the effect of the construction of the approximate 0.26 acre parking lot. The existing site is located in the SE 1/4 of the Section 8, Township 1 South, Range 69 West of the 6`h Principal Meridian, City of Louisville, Colorado. More specifically, the existing site is located on Lot 5 and 6 Block 4, City of Louisville at 611 Front St. The site is bound on the west by a paved alley, on the south by Elm St., on the north by businesses, and on the east by Front St. The existing site is covered by an existing building and existing auxiliary wood huts used for retail sales. Gravel exists between the buildings. The percent impervious of the existing site is 76 %. The proposed development of the site will consist of the demolition of all buildings and services and the construction of approximately 0.24 acres of parking lot and 0.02 acres of landscape planter. The percent impervious of the proposed site is 91 %. The new asphalt area will be graded to drain similar to the existing ground. Per the attached portion of the FEMA Flood Insurance Rate Map (Map Number 08013C05820J, Panel 0582J), the project site is located within Zone AH of the Special flood Hazard Area of the 100 - year floodplain for Coal Creek. Zone AH is defined as an area of the 100 year floodplain that has flood depths of 1 to 3 feet and that Base Flood Elevations have been determined. Per the FEMA mapping, the site does not lie within the 100 year floodway. The 100 -year Base Flood Elevation for the site as noted on the FIRM map is 5333. The average existing elevation of the site is 5332. In my engineering judgment, since the proposed work does not include any buildings and the parking lot drainage will be channeled to an adjacent inlet similar to the existing condition, the proposed work will not adversely affect the water surface elevation of the base flood in this area. 749 Main Street, Louisville, Colorado 80027 • P - (303) 335 -4608 • F - (303) 335 -4550 • www.louisvilleco.gov