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Date July 31,2002 <br /> Quarter 2nd Quarter,2002 <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 J5-00006020 01 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services (SJCPHS) <br /> Assembly Bill 681 Status _Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Second 2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Second 2002): <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 2-22 0 ft <br /> Groundwater Flow and Gradient North 0 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 exceptions <br /> Elevated reporting limits were due to dilutions performed by the laboratory <br /> • The hydrocarbon pattern present in the TPHg analysis is within the gasoline quantification range but <br /> does not resemble gasoline <br /> x vs BP ARC0\%a20\Qua"eW_QTR oz\cwMt dm Page 1 <br />