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• <br />Lower Rum River Watershed Management Organization <br />Andover-Anoka-Coon .Rapids-Ramsey <br />2015 First Avenue;. Anoka, MN 55303 <br />To: Lower Rum River Water Management Organization <br />From: Barr Engineering Company. <br />Date: .October 18, 2006 <br />Re: Permit #2006-24: Northfork Office Condos: Ramsey <br />We have received plans and a LRRWMO permit for Northfork Office Condos to be located at 156"' Lane <br />N.W. and 156"' Avenue N.W. in Ramsey. The site is 11 acres in area and 11 town offices are shown to be <br />constructed. <br />A storm water management basin is located in the southwest corner of the site. This basin is land-locked <br />and we have received soils inforniation that the elevation of modeled soil conditions is approximately 3.3 <br />• -.feet below the bottom of the basin. The basin is too be increased in size and capacity to provide sufficient <br />volume to store the 10-day 100 year frequency storm event. The low floor elevation of the proposed <br />structures are shown to be set a minimum of two feet above the 100-year flood elevation of 878.4 M.S.L. <br />as calculated by John Oliver & Associates. <br />Erosion control is shown to be installed at the limits of construction. <br />It is our recommendation that the LRRWMO approve of the permit for this project subject to the following <br />conditions: <br />1. All erosion control measures must be installed at the initial stages of construction and be <br />maintained until all areas altered have been restored. <br />2. Upon completion of construction and restoration of disturbed areas, the permit applicant is <br />responsible for the removal of all erosion control measures installed throughout the construction <br />site. <br />3. To minimize the potential of material from leaving the site and being tracked onto the roadway, a <br />rock filter dike being a minimum of two feet in height and having side slopes of 4:1 must be <br />• constructed at the entryway onto the site. The rock filter dike will provide an erosion control <br />facility and also enable construction traffic to enter the site. <br />4. Street sweeping must be undertaken and completed on an as needed basis. <br />C:~Documents"and Settings~SjankDwski~Desktop\LRRwM0~2006 Permit memosUrr0624a.doc -41 7 - <br />