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r <br /> l <br /> AMBRIA <br /> jr <br /> October 6, 2005 <br /> Mr Richard Stiffler <br /> OMI-Thames Water Stockton, Inc <br /> 2516 Navy Drive <br /> P O Box 6249 <br /> Stockton, California 95206 <br /> Re September 2005 Self-Monitoring Report <br /> Former Shell Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> Incident 98996184 <br /> SAP 136144 <br /> Dear Mr Stiffler <br /> On behalf of Equilon Enterprises LLC dba Shell Oil Products US, Cambria Environmental <br /> Technology,Inc (Cambria) presents this self-monitoring report for the referenced site <br /> • GROUNDWATER EXTRACTION (GWE) SYSTEM DESCRIPTION <br /> Groundwater is extracted from well RW-IA using a pneumatic submersible pump, and then treated <br /> by four granular activated-carbon vessels in series prior to discharge into the sanitary sewer The <br /> discharge is authorized under a City of Stockton wastewater discharge permit originally issued on <br /> October 23, 2000 and revised on June 28, 2002 The City of Stockton issued a revised self- <br /> monitoring sample program in a letter dated October 10,2003 A detailed description of the site and <br /> GWE system is included in Cambria's Groundwater Extraction System Installation Report dated <br /> July 27, 2001 <br /> MONTHLY COMPLIANCE ACTIVITIES <br /> Monthly Flow Data No discharge of groundwater occurred during September 2005, and monthly <br /> self-monitoring samples were not collected for this period <br /> Cambria <br /> Environmental <br /> Technology,al Discussion The GWE system shut down on August 15, 2005 pending replacement of carbon and <br /> the transfer pump motor starter Both the carbon and the motor starter were replaced on <br /> 0 Hollis street September 6, 2005 The GWE system remained off,however,pending repair and calibration of the <br /> Suite A <br /> Emeryville,CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-4170 <br />