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VVESTE RITNIT 396 EASTEEAKEER STREET GEG-EN, GINFEERS VVOODLAND, CA 95776-6003 • C,-A,Ll--F. C0N-jRkCT0-R 451-138-57 �530) 668-5-300 REGISTERED G-E-.LOGISTS F2kX(53 0)662-C273 Mr. Richard Stiffler June 3, 2005 Environmental Control Section, Department of Municipal Utilities City of Stock-ton 2500 Navy Drive Stockton, CA 95206-1191 (209) 937-8740 Fax (209) 937-8709 RE: May 2005 sewer discharge report for 1876 Country Club Blvd., Stockton, CA. Dear MY 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 2':), 2005 a revision to treatment system was submitted to your office discussing modifications to the treatment system for removal of TBA. As of the above date, no comment has been received. Until the revision to treatment system has been accepted by your department, the treatment system will remain off and no discharge to sewer will occur, see Table and Laboratory Reports attached to this report. Once Western Geo-Engineers has received an approval of the treatment system revision a sample will be obtained of the effluent that will discharge into a 55 gallon drum with no discharge to sewer. This sample will be analyzed for pH (EPA 1.50.J), Total Petroleurri Hydrocarbons (EPA 418.1), BTEX, MTBE, TBA, RIPE, ETBE and TANM (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.