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<br />r I ~( <br />( II <br /> <br />City of ~' <br /> <br />Ell{ River <br /> <br />TO: <br /> <br /> <br />MEMORANDUM <br /> <br />Lori Johnson <br />Finance Directo~ J .AJ1'1 <br /> <br />Darrell Mack~P" I <br />WWTF Superintendent <br /> <br />FROM: <br /> <br />DATE: <br /> <br />June 14, 1999 <br /> <br />SUBJECT: Primary Clarifier Failure <br /> <br />As you know, our #1 Primary Clarifier Drive has failed and needs to be replaced <br />ASAP. There are two reasons why we need to start the replacement process as soon <br />as possible. First, our present plant capacity is 1.6 MGD and our average daily flow <br />is .760 MGD in a 24-hour period, so during our peak flow period from 7:00 a.m. to <br />1:00 a.m., our #2 primary is overloaded which may cause permit violations due to low <br />detention time. This does not allow adequate time for the solids to settle. Second, <br />under the best conditions it will take three or four months to get the parts and have <br />them installed. With our rapid growth, the longer it takes to fix this problem, our <br />chances of permit violations will increase. <br /> <br />s; \offsite \wwtp \clarfail.doc <br /> <br />13065 Orono Parkway · P.O. Box 490. Elk River, MN 55330. TDD & Phone: (612) 441-7420. Fax: (612) 441-7425 <br /> <br />. <br /> <br />. <br /> <br />. <br />