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Date January 21,2004 <br /> Quarter 4th 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 URS/Vernon Elarth <br /> Consultant Project No 38466530 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Compaq _ <br /> WORK PERFORMED THIS QUARTER (Fourth 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2003): <br /> Current Phase of Project Monitoring _ <br /> Frequency of Groundwater Sampling MW-5 through MW-10 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Is Free Product (FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 21 48 to 24 19 feet below ground surface <br /> Groundwater Flow and Gradient North-Northwest @ 0 002 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 reported results for total petroleum hydrocarbons as gasoline(TPHg)in sample MW-6 is due to a <br /> discrete peak at C5 (probably MtBE)and has been rejected <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> • <br /> K 1WProcea51J5 BP ARCUQW2MQnu terly44 QTR 0316020 GWMR 4Q03 doe Page 1 <br />