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Date. July 30,2003 <br /> Quarter 2nd Quarter,2003 <br /> ARCONIT GROUNDWATER UARTERLY MONITORING REPORT <br /> Q O O <br /> Facility No 2186 <br /> Address 3212 North California Street, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466088 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> Assembly Bill 681 Status Propery owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Second 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and subnutted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2003): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Prepare corrective action plan to assess remediation of soils and groundwater at the site <br /> i QUARTERLY RESULTS SUMMARY (Second 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7, and VW-1A through VW-313 <br /> sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 42 01 to 44 36 feet below ground surface <br /> Groundwater Gradient East to Northeast @ 0 01 ft/ft d f[ fi �_v d o ar rru nom, <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (cham-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 /> • Elevated reporting limits in the Method 8015B/8021B analysis of samples MW-4, VW-1B, and VW-2B <br /> were due to the presence of methyl tert-butyl ether(MtBE) in these samples <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte(s) <br /> K%WPmcessV5 BP ARC(M186hQuuner3y\2 QTR 6312 i 66 G WMR 2Q03 do Page 1 <br />