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rA <br />A <br />Jamr <br />ASEN <br />ENCINEERS N ARCHITECTS ® PLANNERS <br />May 6, 1988 <br />222 EAST LITTLE CANADA ROAD, ST PAUL, MINNESOTA 55117 612 484-0272 <br />Mr. Jim Evans <br />Buwtow and Associates <br />2345 Rice Street <br />Roseville, Minnesota 55113 <br />Dear Mr. Evans: <br />RE: Roseville, Minnesota <br />Fairview School Parking <br />Lot at County Road B and <br />Fairview Avenue <br />SEH File No. 78000 <br />As requested, we performed a more complete analysis of the <br />drainage for the above referenced project. This revised analysis <br />was based on the initial comments from the City of Roseville and <br />Rice Creek Watershed Distri _. Because of the project size (less <br />than one acre) Rice Creek waived its rate control restrictions, <br />however, Roseville has asked that provisions for restricting the <br />flow to the greatest extent possible be made. To accomplish <br />this, the castings were changed as follows: <br />North inlet - 0.7 sf opening - Neenah,R-3286-81 �`-- <br />South inlet - 0.6 sf opening - Neenah R-2576B <br />(Note: Casting Type suggested only; sf opening is <br />requirement) <br />With castings such as these, discharge can be controlled from 7 <br />cfs (uncontrolled) to 4 cfs for a 100 year rainfall event and a <br />fully developed site (the undeveloped rate of discharge ..is <br />estimated -to be around 2 cfs). <br />The Rice Creek Watershed District has raised a question <br />regarding water quality features on the site. The area is <br />drained by an extensive storm sewer that also serves STH 36 and <br />the Rosedale Shopping Center. Because the project area is so. <br />small and it contributes direct runoff, into a large conveyance <br />system rather than a pond or wetland, it is felt that any <br />treatment efforts would have a negligible effect on water <br />quality. Therefore no special treatment provisions have been <br />made. <br />SHORT El' XF <br />HENDRIC:KSON INC. <br />