Laserfiche WebLink
Planning Commission <br />May 29, 2009 <br />Page Two <br />Utility Plan <br />1. A clean out will be required on the sanitary sewer service at the 45-degree <br />bend locations. <br />Drainage Calculations <br />1. Documentation should be provided for the proposed infiltration rates that are <br />used. The infiltration area should be capable of infiltrating the required <br />volume within 48 hours. <br />2. The calculations should be updated to match the storm sewer elevations on <br />the Utility Plan sheet. <br />3. The time of concentrations for Subcatchment 2S, 3S, and 4S should be <br />seven (7) minutes. <br />4. The proposed impervious area noted under Pond 3P does not match the <br />Proposed Drainage Area sheet provided. This should be reviewed and <br />corrected. Pond 3P also allows for infiltration over the surface areas noted <br />for storage. Infiltration will not occur with in the storm structures and should <br />be removed. <br />Miscellaneous <br />1. A detail sheet will need to be included in the final plan for the sanitary sewer, <br />storm sewer, and water construction. This should include the type of inlet <br />protection proposed for the catch basins. <br />Please contact me if you have any questions regarding the above information at (763) <br />780-0450 ext. 13. <br />Sincerely, <br />ELFERING & ASSOCIATES <br /> <br />Lee Elfering, P.E. <br />City Engineer <br />cc: Bill Dircks, Public Works Director <br />Ltr-060209-PC <br />10062 Flanders Court NE, Blaine, MN 55449 -Phone: (763) 780-0450 -Fax: (763) 780-0452 <br />