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Memo ^ 1 Bonestnoo <br />^gSltosene <br />Anderilk& <br />|\|| Associates <br />Enyinctrt 4 AitMt«<tt <br />Project Name: Carriage Hill Development <br />To: Tom Kellogg <br />From: Heather A. Olson <br />Client: CityofOrono <br />File No: 139gen - #2467 <br />Date: March 3, 1999 <br />Re: Stormwater quantity and quality review <br />Remarks: <br />General <br />This review concerns the Carriage Hill development as detailed in the plans prepared by Westwood <br />Professional Services Inc. dated 2/19/99. This site is located east of Willow Drive In the northwest quarter <br />of section 10. The site consists of six 2+ acre lots located on approximately 45 acres. The site will drain <br />west under Willow Drive into the wetland surrounding French LaKe. <br />Water Quality <br />The proximity of this development to both French Lake and the adjacent wetlands, increases the <br />irnportance of erosion* control and treatment for the runoff from this site. We offer the following <br />recommendations. <br />1. Heavy-duty silt fencing should be installed on each lot along the construction limits. All silt fencing shall <br />remain intact until there is vegetation established on the entire site. <br />2. The rear yard drainage from lots 1,2,3 and 4 drain into the adjacent wetland without being treated. A <br />26’ wetland buffer has been indicated on the plan, please submit a typical section and description for <br />City staff to review. <br />3. There is some concern for the drainfield/seplic system located on Lot 5 block 1. It appears to encroach <br />upon the proposed water quality ponding. It is recommended that the ordinance for the 75 ’ offset be <br />enforced for this ponding area. The discharge from this drainfield will impact the nutrient loading within <br />the proposed pond which outlets into French Lake. The soil borings should also be submitted for city <br />staff to review. <br />t <br />Bonestroo, Rosene, Anderlik and Assoclates ___________________________ _____ <br />2335 West Highway 36 # St. Paul, MN 55113# Phone:651-636-4600# Fax:651-636-1311