Minutes 01/24/1984 - Laserfiche WebLink

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~58 TUESDAY JANUARY 24, 1984 dramatically reduced. During calendar year 1983, we logged only 18 complaints. Each was promptly investigated. A primary benefit of the "interim" improvements was the doubling of retention time (from 7 to 14 days) of sludge in the primary digester. But this is still not good enough and additional digester capacity is required to increase the retention time up to approximately 25 days, as necessary to provide for successful treatment and given the character of the waste currently coming into the plant. City's Two Choices If the Council continues to accept the fundamental projection that the City will need 7.60 MGD of sewage treatment capacity within 20 years, the simple question is, "How will we acquire 3.60 MGD to go with the 4.0 MGD we now have?" There are two possible answers, if P.S.A. will allow us to divert sewage from the Jones Creek interceptor and buy-in as required to the Koehler plant. These alternatives are as follows: Alternative A: Added Share of Cost Capacity Capital Per Gained Cost Gallon (1) City plant expansion with P.S.A. participation 1. 33 $1,524,200 $1. 14 (2) 100% Jones Creek diversion and buy-in to Koehler plant 2.27 2,153,900 0.95 - - --- 3.60 mgd $3,678,100 $1.022 Alternative B: (1) City plant expansion without P.S.A. participation 2.00 $2,274,900 $1.14 (2) 100% Jones Creek diversion and buy-in to Koehler plant 1. 60 1,632,100 1.02 3.60 mgd $3,907,000 $1. 085 In terms of cost, one has to rank these two alternatives as a toss-up. This is so because both are based in large part on preliminary estimates that could be off one way or another; and/or 0 & M considerations could easily offset the difference in per gallon capital cost. And we still haven't settled the question, regardless of which alternative appears best, of whether to divert to Koehler first or expand our plant first.