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WEA STE RN WOODLAND, CA 95776-60,93 WFE(03 G Ei 0-Ell N-G- ,I N E E R S (5-30) 668-5300 CALIF. CONTRACTOR 9513857 FAX(-530)662-0213 RE G 1ST RED G7 0,�f3-T. Mr. Richard Stiffler July 11, 2005 Environmental Control Section, Department of Municipal Utilities City of Stockton 2500 Navy Drive Stockton, CA 95206-1191 (209) 937-8740 Fax (209) 937-8708 RE: June 2005 sewer discharge report for 1876 Country Club Blvd., Stockton, CA. Dear Mr. Stiffler: The following is the required monthly report documenting sewer discharge activities from 1876 County Club Blvd., Stockton, California. Prior to initiating discharge, a water sample was obtained of the treated water, stored in a drum on April 1, 2005. All sewer discharge requirements were met. Treated groundwater discharge to sewer commenced on April 8, 2005. Upon receipt of the April 29, 2005 analytical results the system was shut down due to the presence of TBA in the effluent stream at 7.1 ug/L. A total of 230,314 gallons of treated groundwater had been discharged to the sanitary sewer clean- out at the site. The number one carbon unit was removed from the system and two new carbon units were added (number 4 and. number 5 positions). A sample of the effluent was obtained on May 12, 2005 with no further discharge to sewer. On May 23, 2005 a revision to treatment system was submitted to your office discussing modifications to the treatment system for removal of TBA. Western Geo-Engineers is currently modifying the treatment system as outlined in the May 23, 2005 correspondence. Once the modifications have been completed the pumping system will be activated with discharge occurring into a 22,000 gallon capacity Baker tank, with no discharge to sewer. A sample of the discharge treated water will be obtained after 10,000 gallons have been processed to determine if the treatment system modifications are successful in removing TBA. This sample will be analyzed for pH (EPA 150.1), Total Petroleum Hydrocarbons (EPA 418.1), BTEX, MTBE, TBA, DIPS, ETBE and TAME (EPA 8260), Total metals Cd, Cr, Cu, Pb, Ni and Zn (EPA 200), and Total Toxic Organics (EPA 624 and 625). Once the analytical results are received, indicating that the revised treatment system effluent meets discharge requirements, the pump and treatment system will be activated and sewer discharge will commence.