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Ep <br />To: <br />Jeanne <br />A. Mabusth, Zoning <br />Administrator <br />From: <br />Mike P. <br />Gaffron, Assistant <br />Zoning Administrator <br />Date: March 10, 1986 <br />Subject: Deering Island CUP: Septic Proposal <br />The applicants have provided <br />analysis for the proposed septic <br />anticipated improvements on this 2_'.65 <br />the information submitted confirms <br />drainfield system is feasible, with a <br />a full design and soils <br />system to serve their <br />acre island. In general, <br />that a suitable trench <br />maximum design capacity of <br />1,050 gallons per day while reserving an alternate site for <br />future use. <br />The primary and alternate sites meet all setback <br />requirements (75' to lakeshore, 3'-plus separation to seasonal <br />saturated conditions, 75' to proposed well) so that the city <br />would expect no lake or well contamination from this system. <br />The applicants have suggested the proposed use of the <br />property will be for day -use recreation, i.e. picnicking, <br />barbecuing, swimming, volleyball, etc., and a combination toilet <br />building/shower facility #s anticipated. As of this writing it <br />is unclear whether additional water -using fixtures might be <br />anticipated, such as a kitchenette or water softener. Because of <br />the unknown potential water use, the applicants should be advised <br />that prudently designed fixtures be incorporated, such as: <br />- Automatic shut-off faucets for sinks. <br />- Restricted -flow faucets and showers - perhaps even a <br />"timed" shower. <br />- Low -water -use toilets. <br />Low -water -use urinal in men's room. <br />- Low -recharge water softener. <br />The use of this property as suggested by applicants would <br />appear to fall into the MPCA design category range somewhere <br />between a "Picnic park with toilet only" and a "Day camp -no <br />meals". hence I suggest a design flow rate of 10 gallons per day <br />per user would be appropriate. This may have a somewhat limiting <br />effect on the number of people that can use the island; with a <br />drainfield capable of handling 1050 gallons per day, I would <br />suggest a logical maximum safe number of users per day would be <br />around 75-125. <br />Finally, note that there is an existing resident` structure <br />on this island which is in poor condition. This structure has an <br />existing well of unknown depth and condition; however, it was <br />producing water s of September 1984. The septic tank serving <br />1 <br />