97-022 Ordinance - Laserfiche WebLink

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i Page 3 The City is aware that it will likely be necessary to install partitions in each of the four aeration tanks in order to better control the periodic growth of the three specified filamentous bacteria. These aze presently controlled by periodically injecting chlorine (90 pounds per day) into the Return Sludge wells between the months of November and May. The filament control injection frequency is approximately once per month for SVI control. Also, the Return Sludge wells have been mildly chlorinated (b0 pounds per day) weekly during the past two months to control the gradual build up of extracellular material in the aeration unit process biomass. This material is believed to originate in the oxidized sludge recycle from the thermal conditioning unit process. Since completion of the Bid Package No. 2 improvements, the biomass has been deficient of an amount of low Dissolved Oxygen (DO) filaments which would create poor settling biomass. This is based on the observations in the WWTP laboratory. The plant laboratory staff microscopically observes the biomass Monday through Friday so that a potential outbreak of deleterious amounts of filamentous bacteria can be potentially detected. The plant staff has recently completed I&C improvements to the TWAS gravity thickening unit process and is currently completing the pilot testing of alternative polymers. To date, the average TWAS density has increased to mid-range value of 2.5 % solids through the use of Type Apptec 203 food industry water soluable cationic polymer for mixed liquor suspended solids having an SVI of 300. Using Cytec Type 1598 oil-based cationic polymer, the average TWAS density was increased to mid-range value of 2.1 % solids for the same mixed liquor suspended solids SVI. The technical proposal must identify the following: 1. The task(s) which are proposed to be completed; 2. A detailed narrative of each task; 3. Identification of the personnel who will be completing the analyses and reporting work task(s); 4. Resumes for each identified person; and 5. A baz chart schedule for completion of proposed task(s). Based on a notice to proceed issued by the City on or about Mazch 15, 1997, the cost proposal must contain the following: 1. An hourly breakdown by task showing the direct labor, indirect costs and reimburseable costs; and 2. Identification of the fixed fee for each task. Before finalization of your technical and cost proposal, you are; requested to submit a draft work plan to the City for review. The draft work plan should identify any data or information which will be needed by you to complete the analysis. The draft work plan should