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SECOR <br /> 10.0 PURGE WATER DISPOSAL <br /> Purge water was transported from a truck-mounted polyurethane tank on the sampling truck to a <br /> holding tank for temporary storage. Following the conclusion of the quarterly monitoring and <br /> sampling event, the purge water was pummped through a treatment system consisting of two <br /> carbon vessels at the Tesoro Terminal. D iring treatment, mid-point and effluent samples were <br /> collected, and the treated water was temporarily stored in a secondary polyurethane tank <br /> pending receipt of analytical results. The midpoint sample will be analyzed for TPHg, BTEX, <br /> and MTBE by EPA Method 8260B. Thee fluent sample will be analyzed for TPHg, BTEX, and <br /> MTBE by EPA Method 82606; total recoverable petroleum hydrocarbons (EPA Method 1664); <br /> and pH (EPA Method 150.1). After it is known that the effluent sample results are in compliance <br /> with waste water discharge permit requirements as stated in the City of Stockton self-monitoring <br /> sample program, the purge water is discharged into the City of Stockton sanitary sewer system. <br /> The flow totalizer and lower explosive limit (LEL) meter operate continuously during discharge, <br /> and measurements were recorded at 30-minute intervals. Upon completion of discharge, a <br /> separate report is submitted to the Department of Stockton Utilities, documenting the waste <br /> water discharge event. <br /> The remainder of the fourth quarter purge water was treated and discharged during the first <br /> • quarter 2006. First quarter purge water will be treated and discharged during the second <br /> quarter 2006. <br /> • <br /> STTC IQ06 Final Report 21 May 1,2006 <br /> 770T.43673.12.0002 <br />