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09/14/00 THU 11 00 FAX 1 916 861 0430 SECOR-SACRAMENTO Addmonal Evaluauon of Potablc Watcr 5ourccs page 2 Rapch Market Suc 235fi9 S Santa Pe Road R��erbank,CA _. semcmbcr 14,2000 OPTION 1 WELL HEARD TREATMENT Per the request of the State Water Resources Control Board UST Cleanup Fund, SECOR has prepared a cost estimate to install and operate a well head treatment system that will treat water pumped from well DW-1 The treatment system was designed to treat water pumped from well DW-2 at 10 gallons per minute with an average MtBE concentration of 50 parts per billion Well Repair- As part of the scope of work, the State Water Resources Control Board UST Cleanup Fund requested that domestic well DW-2 be re-developed and the hole present in the casing at 32 feet below grade surface (bgs) be sealed by grouting in a 4-inch diameter PVC casing Water Development Corporation reviewed the scope of work and indicated the annular space between the 6 25-inch inner diameter steel casing and the 4 5-inch outer diameter PVC casing would be 0 875 inches The minimal annular space will not allow placement of sand and grout between the outer steel casing and inner PVC casing Water Development stated they would not attempt the proposed work because it was technically unfeasible Due to casing size limitations, the cost to repair the well was not included in SECOR's cost estimate The cost estimate assumes the well will be m-developed and a pump installed in the well without repairing the hole m the steel casing Treatment System Installation-As shown the system design sketch provided in Attachment 3, the system consists of the following equipment Well Pump and Controls Pre-Treatment Filter Three Fiberglass Bullet Canisters loaded with 200 pounds of virpm coconut 602 carbon Post-Treatment Filter Water Flow Meter Existing Pressure Tank Water Softener Assuming a carbon consumption rate of 3 pounds per day,MtBE break through of the first carbon canister would occur 66 days after system operation. The estimated costs for the well repair and treatment system installation are presented in Attachment 4 System O&M and Carbon Change Out-The budget assumes bi-weekly collection of water samples from three points influent sample port,after Carbon#1, and after Carbon#3 The water samples will be analyzed for BTEX,TPHg,oxygenates, 1,2-DCA, and EDB using EPA method 8260B Assuming a carbon consumption rate of 3 pounds per day,MtBE break through of the first carbon canister would occur after 66 days of system operation The budget assumes the one carbon canister will be replaced every two months Quarterly System O&M Reports-The budget assumes the water samples results and a summary of the system operation and maintenance will be included in the quarterly groundwater inonitonng and sampling reports File Ranch Markc(TotwaterSourcc-I Itr doc