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Date May 13,2004 <br /> Quarter- 151 Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2130 <br /> Address 7906 North EI Dorado Street, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466468 OL058 <br /> Primary Agency San Joaquin County Environmental Health Division <br /> (SJCEHD) <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (First 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling from site wells <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Continued to infect ambient air at low flow rates <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Continue bubbling of ambient air at low flow rates into selected wells <br /> QUARTERLY RESULTS SUMMARY (First 2004). <br /> Current Phase of Project Monitoring/Remediation <br /> Frequency of Groundwater Sampling MW-1 through MW-7, and VW-1 through VW-12, MS-1A, <br /> MS-1 B, MS-2A, MS-2B, MS-3A, and MS-3B sampled <br /> quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present onsite No <br /> Current Remediation Techniques Natural attenuation/Air bubbling <br /> Approximate Depth to Groundwater 37 93 to 40 38 feet below ground surface (ft bgs) - <br /> Groundwater Flow and Gradient Southeast @ 0 001 feeVfoot(ft/ft} <br /> ANALYTICAL DATA REVIEW: <br /> Please note that during 2003, the laboratory has changed Total Petroleum Hydrocarbons as Gasoline (TPHg) to <br /> Gasoline Range Organics (GRO) The resulting data may be impacted by the potential inclusion of non-TPHg <br /> analytes within the requested carbon range resulting in a higher concentration being reported Where the resulting <br /> GRO concentration is based on a single analyte (i e, a non-TPHg analyte or a single TPHg analyte), the analyte will <br /> be identified if possible <br /> K 1WPr0"0J5 BP ARC0\02130fQuarierlyll QTR 0612130 GWMR 1Q04 do Page 1 <br />