SITE INFORMATION AND CORRESPONDENCE FILE 3

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I C A M B R I A FD , AN 1 7 21007 EvIVIHONfvI �NI HLAL1H January 12, 2007 Mr. Richard Stiffler PE r rQV! Cc ) OMI-Thames Water Stockton, Inc. 2516 Navy Drive P.O. Box 6249 Stockton, California 95206 Re: December 2006 Self-Monitoring Report Former Shell Service Station 2575 i © Country Club Boulevard Stockton, California Incident 98996184 SAP 136144 i Dear Mr. Stiffler. On behalf of Equilon Enterprises LLC dba Shell Oil Products US, Cambria Environmental Technology, Inc. (Cambria) presents this self-monitoring report for the referenced site. i GROUNDWATER EXTRACTION (GWE) SYSTEM DESCRIPTION The GWE system extracts groundwater from wells RW-lA, MW-5R, MW-8, and MW- 18 using submersible pneumatic pumps. Groundwater is treated by two 2,000-pound granular activated-carbon (GAC) vessels in parallel, followed by another two 2, 000-pound GAC vessels in parallel, followed by two 1 ,000-pound GAC vessels in series prior to discharge into the sanitary sewer. Discharge is authorized under a City of Stockton wastewater discharge permit originally issued on October 23 , 2000 and revised on June 28, 2002, The City of Stockton issued arevised self-monitoring sample program in a letter dated October 10, 2003 . The permit has been renewed, with some revised i terms and conditions, as of November 1 , 2005 . Monthly Flow Data: No discharge to the sanitary sewer occurred during December 2006. Cambria Discussion: Final inspection of the GWE system occurred on December 7, 2006 . The system was Environmental then started for the purpose of collecting startup samples. As discussed with the City of Stockton, the Technology, Inc. j treated groundwater was captured in a holding tank and not discharged to the sewer. Approximately 5900 Hollis Street 3 ,500 gallons of groundwater were processed prior to collecting samples. The system was shutoff Suite a Emeryville, CA 94608 following collection of these samples. Tel (510) 420-0700 k-" Fax (510) 420-9170