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i1 <br /> r� <br /> Date June 18,2003 <br /> Quarter- 2"d Quarter 2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6020 <br /> Address 1711 E Yosemite Ave-, Manteca, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466092 00436 <br /> Primary Agency/Regulatory ID No _San Joaquin County _ <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Second 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and subirutted quarterly groundwater monitoring report <br /> 3 Prepared and submitted additional site assessment workplan <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2003): <br /> I Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Conduct additional site assessment <br /> QUARTERLY RESULTS SUMMARY (Second 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater MW-5 through MW-10 sampled quarterly <br /> Sampling <br /> Frequency of Groundwater Quarterly <br /> Is Free Product (FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 20 4 to 22 3 feet below ground surface <br /> Groundwater Flow and Gradient North Q 0 003 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 /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> i <br /> K 1Wpr c ss\15 gp ARCMW20NQuant jy%2 Q'M 0316020 GWMnQ03 doc <br /> Page 1 <br />