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Date. July 30,2003 <br /> Quarter- 2°d Quarter,2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6080 <br /> Address 85 Louise Avenue, Lathrop, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466093 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> WORK PERFORMED THIS QUARTER (Second 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted 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 /> QUARTERLY RESULTS SUMMARY (Second 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-3 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 8 79 to 9 21 feet below ground surface <br /> Groundwater Flow and Gradient East to Northeast @ 0 01 feet/foot <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 <br /> laboratory <br /> DISCUSSION: <br /> Methyl tert-butyl ether (MtBE) was the only analyte reported in groundwater samples collected from site wells this <br /> quarter Analyte concentrations were generally consistent with historic data All other analytes were reported as <br /> below laboratory detection limits Groundwater elevations in site wells increased relative to the previous quarter <br /> The inferred direction of groundwater flow was to the east to northeast with an average gradient of 0 01 ft/ft, which <br /> is consistent with historic data <br /> This report is based on data, site conditions, and other information that are generally applicable as of the date of the <br /> report, and the conclusions and recommendations herein are therefore applicable only to that time frame <br /> K 1wimcessV5 BP ARC040W901Quanerlyl2 QTR 0316080 GWMR 2Q03 do Page 1 <br />