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• Date: July 7,2003 <br /> Quarter: 2nd Quarter,2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 760 <br /> Address: 225 South Cherokee Lane, Lodi, CA <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: URS/Vernon Elarth <br /> Consultant Project No.: 38466087.00902 <br /> Primary Agency/Regulatory ID No.: San Joaquin Count <br /> Assembly Bill 681 Status: Gur reet Dhatt and Kuldeep Dhatt <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 /> I. 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: Quarter) <br /> Is Free Product FP Present Onsite: No <br /> FP Recovered this Quarter: None <br /> Cumulative FP Recovered to Date: None <br /> Current Remediation Techniques: None <br /> Approximate Depth to Groundwater: 56.67—57.41 feet below ground surface <br /> Groundwater Flow and Gradient: South to Southeast @ 0.007 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 <br /> laboratory. <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), total xylenes, methyl tert-butyl ether (MtBE), and 1,2- <br /> dichloroethane (1,2-DCA) were reported in samples collected from site wells sampled this quarter. TPHg <br /> concentrations increased in MW-2 relative to those reported during the previous sampling event. MtBE <br /> concentrations were detected in MW-3 at a concentration of 0.68 mg/L, which was an increase from the previous <br /> sampling event. Groundwater elevations in site wells increased relative to the previous monitoring event. The <br /> inferred groundwater flow direction was to the south-southeast at an average hydraulic gradient of 0.007 feet/foot. <br /> K:\WpmcessVS BP ARC0\00760\Quarter1y\2 QTR 03\760 GWMR 2Q03.dm Page 1 <br />