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Date February 5,2003 <br /> Quarter 4`b Quarter,2002 <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 38465927 00336 <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 (Fourth 2002): <br /> 1 Performed quarterly groundwater monitoring and sampling from site wells MW-10 is still paved over <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Continued to inject ambient air at low flow rates <br /> WORK PROPOSED FOR NEXT QUARTER (First 2003): <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 /> 4 Efforts will be made to reconstruct the wellhead of MW-10 <br /> 5 Sampling will include the vapor extraction wells at the site,following redevelopment in December <br /> QUARTERLY RESULTS SUMMARY (Fourth 2002): <br /> Current Phase of Project Mon itonn /Remediation <br /> Frequency of Groundwater Sampling MW-1 through MW-7, MW-10, and VW-1 through VW-12 <br /> sampled quarterly <br /> Frequency of Groundwater Monitoring Quarter! <br /> Is Free Product (FP) Present onsite No <br /> Current Remediation Techniques Natural attenuation/Air bubbling <br /> Approximate Depth to Groundwater 40 7 to 42 7 feet below ground surface <br /> Groundwater Flow and Gradient Southeast 0 0 002 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Groundwater Samples Collected on 12/18/2002 <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records,blanks, dilutions, holding times, <br /> LCS/LCSD results, MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the <br /> laboratory <br /> i <br /> K V5 RP ARC0\02130\Quaner1y\4_QTR 02\2130GWMR4QO2 duc Page 1 <br />