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Elk River Planning Commission <br />August 19, 1998 <br />Page 2 <br /> <br />Storm drainage will be accomplished through a number of means. First, a catch basin will <br />be constructed in the southwest corner of the parking lot, connecting to the existing storm <br />sewer on Freeport Avenue. It appears that the drainage area tributary to this catch basin is <br />rather small. It is unclear from the building diagrams where the roof drainage will go. We <br />question whether this catch basin is actually needed, given the small tributary area, unless <br />of course the roof drains to this location. Secondly, an existing catch basin on the site, <br />located in the drive-through area of the Wendy's, is proposed to be removed and <br />abandoned. More information needs to be provided as to how this would be accomplished. <br />Is it proposed to entirely remove this catch basin structure and then bulkhead the existing <br />pipe, or is it proposed to just lower the catch basin, put a solid cover on it, and leave it in the <br />grass area? The third storm drainage improvement is the extension of two catch basin <br />leads from an existing catch basin at the northeast corner of the existing parking lot. There <br />are two issues with this proposal. The first is that the existing catch basin is probably not <br />large enough to accommodate two additional pipes at the angles proposed. We would <br />recommend removing the structure and replacing it with a larger structure that can <br />accommodate the two new pipes and the existing pipe. The second issue is the pipe <br />leading from the catch basin to Freeport Avenue is 12 inches in diameter. Storm sewer <br />calculations will need to be provided to prove that the 12-inch pipe is capable of draining the <br />entire area tributary to it, without causing problems. <br /> <br />The landscaping plan shows a number of trees located along the south and west sides of <br />the site, which appear to be located in the drainage and utility easement. We are unsure if <br />any utilities are located in this easement. If there are, it is questionable whether trees <br />should be allowed to be planted in the drainage and utility easement. <br /> <br />If you have any questions regarding any of these comments, please call. <br /> <br />Sincerely, <br /> <br />Howard R. Green Company <br />Tearer, P.E. <br /> <br />TJM/st <br /> <br /> Howard Green Company <br />O:\PROJ\a04780j\0240\780-1901.aug.doc CONSULTING ENGINEERS <br /> <br /> <br />