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Date October 30,2003 <br /> Quarter 3`1 Quarter,2003 <br /> i <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 38466262 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 (Third 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling from site wells <br /> 2 Prepared and submitted quarterly groundwater momtonng report <br /> 3 Continued to infect ambient air at low flow rates <br /> 4 Obtained permission from the City of Stockton to have MW-10 destroyed on September 25,2003 <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 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 Revise Site Conceptual Model Report <br /> QUARTERLY RESULTS SUMMARY (Third 2003): <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-213, MS-3A, and MS-313 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 41 57 to 43 78 feet below ground surface <br /> Groundwater Flow and Gradient Northeast to Southeast @ 0 002 feet/foot (ft/ft) <br /> ANALYTICAL DATA REVIEW: <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 laboratory <br /> with the following limitations <br /> • The elevated reporting limits were the result dilutions performed by the Iaboratory in order to <br /> quantitate a target analyte(s) <br /> K 1WPr0CeSSV5 BP ARCO=1301Qua erlyV QTR 0312130 GWMR 3Q03 8oc Page 1 <br />