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<br />CI1y of Gentervllle <br />PublIc Works facility <br /> <br />Page 3 <br />6/22/07 <br /> <br />Storm Sewer <br />Currently, the site operates without storm sewer. Most drainage flows to the north end of the site overland <br />and is planned to go into a rain garden (yet to be constructed) along the west edge of the wetland at the <br />north end of the site. <br /> <br />Ponding or other drainage features <br />No ponding is required since the added impervious area is less than 1 acre (it's about 0.95 acres). This <br />means that if any amount of pavement is to be added to the site for any accessory buildings or uses, it <br />would move us past the threshold and a pond would be required. It is our advice that a pond be sized and <br />shown on the grading plan to ensure there is room if one would be needed in the future. <br /> <br />Grading. drainage and erosion control <br />Grades around the site are generally very flat for typical parking lot grades. This is somewhat mitigated by <br />the fact that most of the lot is concrete rather than blacktop. Prior to the City signing off on the <br />improvements, a detailed inspection of the pavement drainage should be conducted to ensure there are no <br />puddles. <br /> <br />The submitted plan does not show sufficient erosion control measures or proposed permanent turf types. <br />This should be discussed with the owner to make sure the site has proper turf establishment before the City <br />takes it over. <br /> <br />Wetland impacts and mitigation <br />The SE corner of the site could be better utilized either as additional space for the public works facility or as <br />a possible parcel to be sold off if wetlands could be mitigated in a strategic fashion. Wetland Conservation <br />Act rules however, will dictate if and how this can be done. <br /> <br />Improvements to Cedar Street <br />The City should consider whether or not Cedar Street should be improved to a paved condition and/or an <br />urban section. The added traffic to and from the facility may create dust problems for the neighbors as well <br />as add issues with the City's equipment maintenance. <br /> <br />Please call with any questions. <br /> <br />Sincerely, <br /> <br />BONESTROO <br />~#A- <br />Mark Statz, PE <br />City Engineer <br />651-604-4709 <br /> <br />Attachments: Drawing of site with comments shown <br /> <br />copy: RJG, MRR, file <br />