City Council Agenda and Packet 1984 07 17

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. Special Meeting, Citouncll ` June 30, 1984 Minutes Page 2 however, due to key components/materials delayed and on back-order, it will not be completed until arid-August, with the very final in October. Louisville's 2 filter plants cannot produce treated water at the levels designed. The design capacity of the north treatment plant is 5.5 MGD provided adequately sized pretreatment and optimum filter runs over .several maximum days. However, staff has concluded from our own and Isis that due to additional hydraulic constrictions limiting plant #1 quite seriously, the maximum gross production capability is 3.2 MGD. The backwash process uses 0.20 to 0.60 NG which reduces our "net" production for public use. Backwash under peaking conditions. at flows under 2.5MGD requires 200 ,000 gallons , more or less . With the reduced pretreatment detentions under peak loadings , the dirtier filter runs will often require up to 600 ,000 gallons per day. This is an 18% backwash consumption versus normal 5% to 7%. Therefore a gross production of 3.2MGD will net 2.7 MGD after backwash. Any sustained demands cannot be met, and drafting of the 3 MG storage tank results. Kasch continued that the plant's limitations were not discovered prior to our investigations , because 1 ) a belief that the pre- treatment was the major and sole problem; 2) No real demand to investigate the total plant hydraulics since all major components are sized for ultimate capacity, and; 3) Sketchy recordkeeping and data prior to late 1983, and not having the demands to push the plant to its limit. Obviously from the attached production/demand chart, the hydraulic improvements significantly double the production from Plant #1 . The hydraulic improvements by themselves would not increase total production without the pretreatment. Onus dependent upon the other, and they should be viewed as one project, therefore, staff presents Fast Track #1 and Fast Track #2, for your approval as follows : Fast Track #1 1 ) New backwash pump system, vault, electrical , etc. 2) Yard piping modifications to facilitate Plant #1 hydraulics. Total cost $130 ,000 Fast Track #2 1 ) Plant #1 piping and metering improvements . 2) Expanded chemical pacing capabilities. Total cost $35,000. Phase I Howard Berry Plant is currently in Engineering , and will be "on-line" for load season, 1986. Mayor asked if after the filter plant work is completed , would we be up to capacity? Bill Schuler, Rocky Mountain Consutants , answered yes , it should be full capacity. Council members asked Schuler and Klee questions pertaining to the memorandums sent from RMC concerning different numbers of MGD.