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:Aft,, MEMO To: Ralph Bohlmann Date: July 10, 2000 From: Dennis Long 'N? Subject: 2000 Dewatering Centrifuge Project Recommendation to Lease a Dewatering Centrifuge and to Reschedule the Project Bidding Schedule As discussed at a July 6, 2000 meeting regarding present offsite odors, the purpose of this memo is to recommend that the City take the following actions: 1. Proceed to take the necessary administrative, legislative, financial and technical steps to enter into a three (3) month lease for a portable high speed, high solids, solid bowl dewatering centrifuge; 2. Continue with the 2000 Dewatering Centrifuge Project, so that a permanent dewatering centrifuge unit process can be operational by April 1, 2001; and 3. Reschedule the bidding process to begin the first week in October 2000. The recommendation is being made for several significant reasons. These reasons are as follows: 1. to demonstrate that offsite odor.s would be almost, if not entirely, and continuously eliminated after abandonment of the aging thermal conditioning/vacuum filtration dewatering unit process; 2. to generate actual dewatering centrifuge operating cost data for futu.re Wastewater Division budgets which will document the actual annual reduction in the cost of operating the plant due to a dewatering centrifuge unit process; 3. to provide the plant maintenance and operating staffs with hands on experience with a dewatering centrifuge unit process; 4. to demonstrate the likely long term operation of the aeration and final clarification unit processes after completion of the biological selection work and acquisition of a dewatering centrifuge unit process; 5. to accurately quantify the amount of existing aeration tankage and final clarification capacity to be reclaimed due to completion of the biological selection work and acquisition of a dewatering centrifuge unit process; and 6. to precisely determine the optimum size of dewatering centrifuge to be acquired by the City. The following sections of this memo provide administrative, technical and financial data and information to support the recommended lease.