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• Lower Rum River Watershed Management Organization Andover-Anoka-Coon Rapids-Ramsey 2015 First Avenue; Anoka, MN 55303 To: Lower Rum River Water Management Organization From: Baia Engineering Company Date: October 16, 2006 Re: Permit #2006-25: GMI Addition: Ramsey We have received plans and a LRRWMO permit fora 10,000 square foot building addition to GMI located west of Sunfish Lake Boulevard and north of Bunker Lake Boulevard in Ramsey. The site is 1.8 acres in surface area. The plans show that storm water from the site is to be conveyed to a storm water management basin to be .constructed on the wets side of the site. The basin has been designed to meet the LRRWMO storm water • management requirements. The 100-year frequency flood elevation of the basin, as calculated by Plowe Engineering, is 865.4 M.S.L. The lowest floor elevation of the existing on-site structure and proposed. addition is 882 M.S.L. Erosion control is shown to be installed at the limits of construction. It is our recommendation that the LRRWMO approve of the permit for this project subject to the following conditions: 1. All erosion control measures must be installed at the initial stages of construction and be maintained until all areas altered have been restored. 2. Upon completion of construction and restoration of disturbed areas, the permit applicant is responsible for the removal of all erosion control measures installed throughout the construction site. 3. To minimize the potential of material from leaving the site and being tracked onto the roadway, a rock filter dike being a minimum of two feet in height and having side slopes of 4:1 must be constructed at the entryway onto the site. The rock filter dike will provide an erosion control facility and also enable construction traffic to enter the site. • 4. Street sweeping must be undertaken and completed on an as needed basis. C:\Documents and Settings\sjankowskilDesktop\LRRWMO\2006 Permit memos\1rr0625.doc -41 9-