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Mr. Rick DeGardner <br />June 2, 2021 <br />Page 2 <br /> <br />Equipment <br />WSB will mobilize its laboratory trailer and set-up the following skid-mounted pilot equipment at <br />the well to be piloted: <br /> <br />• Biological contact aerator column with air diffuser <br />• Biological filter column with granular activated carbon media <br />• Manganese filter column with greensand media covered by anthracite <br />• Air compressor for supplying air to the contact aerator column <br />• An orthophosphate feed system if needed to provide a nutrient for the biological process <br />• A sodium permanganate feed system for oxidizing manganese prior to the greensand filter if <br />needed <br />• Miscellaneous components including a skid support, booster pump, valves, piping, tubing, <br />sample taps, and appurtenances as necessary for operation of the pilot equipment. <br /> <br />The City will be responsible for ordering and purchasing orthophosphate and sodium <br />permanganate from its local chemical supplier and provide the necessary storage and <br />containment for these chemicals. <br /> <br />Manpower and Field Testing <br />Prior to the start-up of the testing period, WSB staff will be on site for one to two days to set-up <br />and start-up the equipment and train utility staff to assist in the operation and monitor the pilot <br />plant for the duration of the pilot study. Utility staff will assist in the operation, monitor the pilot <br />equipment, and conduct water sampling and field testing as needed for the duration of the pilot <br />study. WSB will visit the plant about once every one to two weeks to observe and monitor the <br />pilot study equipment and water quality testing. <br /> <br />Daily on-site monitoring will be provided by utility staff to read and record the pilot plant flow rate <br />(gpm) and air flow rate (SCFM). Utility staff will also need to monitor the operation of the chemical <br />feed systems daily. We estimate that these tasks will require approximately 20 to 30 minutes per <br />day by staff. <br /> <br />Weekly on-site field sampling and analysis will be provided by utility staff for the following water <br />quality parameters. We estimate that the following on-site analysis will require approximately 1.5 <br />to 2 hours per week by utility staff. The utility will provide all water quality analysis equipment and <br />reagents that are required to test each of these parameters. <br /> <br />Sampling Point Weekly Field Sampling and <br />On-Site Analysis Required <br />Raw water at pilot plant entry point Iron, manganese, ammonia, nitrite, nitrate, <br />temperature, pH and flow rate (gpm) <br />Biological contactor aerator column effluent Iron, manganese, ammonia, nitrate, nitrite, <br />dissolved oxygen, and air flow rate (SCFM) <br />Biological filter column effluent Iron, manganese, ammonia, nitrate, nitrite, <br />dissolved oxygen, air flow rate (SCFM), and pH <br />Manganese filter column effluent Iron, manganese, ammonia, nitrate, nitrite, <br />dissolved oxygen, and air flow rate (SCFM) <br /> <br />Sampling and analysis by an independent certified laboratory will be coordinated and provided by <br />the utility bi-monthly (every-other week) intervals for the following water quality parameters. We <br />estimate that the following sampling will require approximately 1 hour every-other week by Utility <br />staff. The Utility will pay for the shipping costs for the water sample bottles and all water quality <br />analysis to be provided by the independent laboratory.