1995 JT MIN NOV 16 - Laserfiche WebLink

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Mr. Stephenson stated that the oxidation ditch process with external secondary clarifier offers several advantages. The external secondary clarifier provides operational flexibility - ability to readily "tweak" process, ability to chlorinate and coagulate solids through chemical addition. Operational flexibility is 20-30 days solid retention time and can use chlorine for microorganism control. One way to solve problem of clarifier being out of service is to add polymer. With its multiple train reliability, it can maintain a secondary clarifier. Waste sludge handling and equipment costs are reduced with external clarifiers - clarifier underflow concentrate results in less volume, wasting of process control is simple, and uses economical dewatering of waste sludge. They can deal with sludge in any manner the City needs to meet guidelines. The oxidation ditch process can be delivered in a variety of ways (design/bid/build, etc.). In summary, the oxidation ditch process with external clarifiers is a demonstrated technique, very reliable with flexibility, and it is cost effective. It is his firm's opinion that this is the solution for wastewater treatment. A question posed was what is the time of construction from date of contract to start date? Each firm responded as follows: Montgomery -Watson - depending on delivery method chosen, approximately 18 months. LEMNA - July, 1996. Process takes 6 months once order is placed. NATS - 4 months to bid, 18 to construct, for a total of 22 months. Mark Adelson noted that he can work on any deficiencies the Title 22 report may include. There is room for compromise but not on full reliability necessity. Mayor Fulp advised the Utilities Commission to deliberate and get back to City Council. He noted it is a most important decision. It has long-term future impact. He asked that the Utilities Commission put money matter aside, consider technology, our environment, where it will be installed, and which is best system for the community for the next 50 years - divorce consideration from cost. City Manager Martinez asked the Utilities Commission to consider existing technology and how long it has been in existence at the plant. Mayor Fulp asked Chairperson Butler to put back on the Utilities Commission agenda for its next meeting and come back on December 19, 1995 to put forth recommendation to the City Council. Chairperson Butler also request that PCA information be placed on Utilities Commission's December 11, 1995 meeting. Mayor Fulp thanked the Utilities Commission, welcomed Commissioner Sparks, thanked all that made presentations, thanked Staff and City Manager Martinez. There being no further business to come before the City Council and Utilities Commission, the meeting was adjourned at 9:15 P.M. 04.s,,M2.n �E)m i Carmen S. Kesler Administrative Secretary, Electric Utility Utilities Commission Secretary 4 NOV 16 1995