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Date August 8,2002 <br /> Quarter 2"Quarter, 2002 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 0434 <br /> Address 501 W Kettleman Lane, Lodi, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Cc/Contact Person LIRS/Vernon Elarth - <br /> Consultant Project No J5-00000434 01 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental health Services <br /> (SJCEHS) <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 groundNNater monitoring and sampling <br /> I <br /> 2 Prepare and submit quartet ly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Second 2002) <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling W-1 A, W-2, W-2A, W-213, W-3, W-9 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 58 0 to 59 9 ft <br /> Groundwater Gradient Variable, converging to southeast 0 0015 to 0 0007 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 /> i <br /> Total petroleum hydrocarbons as gasoline (TPHG), was reported as below detection limits in all six wells sampled <br /> this quarter Methyl tert-butyl ether (MTBE) was reported below detection limits in all wells Chemical <br /> concentrations are consistent with historical data Groundwater elevations across the site decreased by an average of <br /> 2 57 ft Groundwater flow direction was variable, but flow generally converged to the southeast portion of the site, <br /> with an approximate gradient that ranged from 0 0007 to 0 0015 It/it Wells W-2 and W-2A, clustered in the <br /> . southeast portion of the site have overlappmg screen intervals but exhibit significantly different water levels The <br /> water level obtained from well W-2A was not used in contouring because it appears to be anomalous when compared <br /> I,U5 0P ARCQW0434\Qu.=a1)U QCR 021GWMR do, Page 1 <br />