City Council Agenda and Packet 1984 06 30

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i osky Mt1unytn CensaMarlp4 lne. 4280 East Evans Avenue.Suits 7•Denver CO 80222•(343)758.4532 Moss also located in Longmont and Estes Park,CO .tuns 26, 1984 Mr. Leon A. hurl City Administrator City of Louisville 749 Main Street Louisville, CO 80027 Deer Mr. WurT: The following explanation Is provided to help clarify the discrepancy between what Is now known to be the "actual" treatment capacity of the existing water system and what had been prsvlosuly addressed In the past as the treatment capacity of the existing system. The Improvements to Filter Plant 01 , handled by Bruns t Associates in 1971-72, identified the plant capacity at 5.0 MGO following the improvements they proposed. Subsequent analysis by RMC of the major coponents of the plant (filter beds, pipe size, etc.) to determine the hydraulic capacity of the plant identified that all major components were capable of 3.51' MGD hydraulic capacity. The scope of subsequent RKC projects did not necessitate a detailed analysis of treatment or hydraulic capacity of the plant. The operation of both Filter Plants /1 and 02 for the years 1980, 1981 , 1982 were analyzed in detail by RMC in 1983 to determine treatment efficiency; it was determined that at the current demand for 1980-82, the pretreatment systems were substantially Inadequate and would not be reliable for total system demands in excess of 3.0-3.5 MGD. Recommendations for improving the pretreatment systems were made and accepted and are currently nearing construction completion. With the aid of the "new" City staff It became apparent that there were some very real concerns as to the accuracy of past treated water accounting procedures which indicated that the assumed treatment capacity was substan- tially higher than the actual treatment capacities. When this discrepancy became very apparent in May 1984, the City's staff requested that RMC perform a detailed hydraulic analysis of the total treatment system. This analysis indicated that the hydraulic capacity of Filter Plant 01 as It is currently operated is substantially below 3.5 MGD but could be improved with relatively minor piping/pumping revisions or changes in operation of the system.