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Date August 9,2004 <br /> Quarter 2nd 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 (Second 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 inject ambient air at low flow rates into well VW-10 <br /> WORK PROPOSED FOR NEXT QUARTER (Third 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 well VW-I O <br /> QUARTERLY RESULTS SUMMARY (Second 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-1 A, <br /> MS-1 B, MS-2A, MS-2B, MS-3A, and MS-38 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 43 01 to 45 37 feet below ground surface (ft bgs) <br /> Groundwater Flow and Gradient Northwest-Northeast @ 0 001 feet/foot ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Please note that as of April 1,2004,the laboratory has changed the carbon range for gasoline range organics(GRO) <br /> from C6 — CIO to C4 — C12 (to include the oxygenates) The resulting data may be impacted by the potential <br /> inclusion of additional total petroleum hydrocarbons as gasoline (TPHg) and non-TPHg analytes within the revised <br /> carbon range, which may result in a higher reported concentration Where the resulting GRO concentration is based <br /> on a single analyte(i e,a non-TPHg analyte or a single TPI-Ig analyte),the analyte will be identified if possible <br /> g%Wprocess115 BP ARC0\021301Quww1yl2 QTR 6412[30 GWMR 2QO4 doc Page 1 <br />