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Memo 1/1 Bonestroo <br />ggRowne <br />Anderlfl(& <br />|\J| Associates <br />EnglMtrt 4 ArcMitctf <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/septic 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 drainfleld will impact the nutrient loading within <br />the proposed pond which outlets into French Lake. The soil borings shcuid also be submitted for city <br />staff to review. <br />Bonestroo, Rosene, Anderllk and Associates <br />2335 West Highway 36 # St. Paul, MN 55113 # Phone:651-636-4600# Fax:651-636-1311