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TO: ✓Walter R. Benson, City Administrator <br />Glenn Cook, City Engineer <br />Bruce Malkerson, City Attorney <br />John Cerhardson, Public Works Coordinator <br />Jeanne Mabusth, Zoning Administrator <br />PROX: Michael P. Gaffron, Septic Systems Manager <br />DATE: ,Tanuary 18, 1984 <br />SUBJECT: Paul Smith - 2477 Dunwoody Avenue - Holding Tank Feasibility <br />As per Bruce Mal.kerson's suggestion, I have conferred with various <br />contractors as to the feasibility and costs involved in installing a <br />holding tank system to serve the Smith residence as an alternative to <br />connection to sewer. Based on the extreme elevation difference between <br />the upper and lower levels of the Smith property, the most feasible <br />holding tank alternative is to place a grinder pump in the pumping <br />cham'--er which Smith has apparently already installed, and pump the entire <br />se�:ace flow tj a holding tank located on the high ground east of Smith's <br />house. <br />A rough estimate on the cost for this installation: <br />1 - 1500 gallon precast concrete tank (installed) $1,500-$2,000 <br />Grinder pump and force main to tank (installed) $1,5G0-$2,000 <br />Total estimated cost 1 $3,000-$4,000 <br />(Add $500t for a 2,000 gallon tank instead. Note that most pump trucks <br />working in our area can only handle a 1,500 gallon load) <br />Maintenance costs - pum outs <br />Holding tanks are an aconunical alternative to sewers or septic systems only <br />under minimal or seasonal usage. Published data suggest actual water use <br />for single family residential units averages 45 gallons per person per day. <br />(This is somewhat less than the 75 gpd/person rate used in septic syst,.m <br />design) Assuming two people at 45 gpd/person for the three month summer <br />period: <br />2 X 45 gpd X 90 days = 8,100 gallons for the summer. <br />9,100 . 1,500 gallon tank capacity - 5.42 or 6 <br />The tank would have to be pumped out six times over the course of the <br />summer at a per pumpout cost of $75-$100, so estimated pumpout cost would <br />be $450-$600 for the summer under these water use conditions. <br />The Or -Site Code (copy attached) includes requirements for metering the <br />water used, a disposal contract, and warning systems to prevent accidental <br />r':« . `low. <br />M i <br />