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t• <br /> fL <br /> �l Date July 23,2003 <br /> Quarter 2nd Quarter,2003 <br /> • <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 Co/Contact Person URSNernon ElarthT <br /> Consultant Project No 38466099 00636 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services <br /> (SJCEHS) <br /> Assembly Bill 681 Status Property owned by Mark Garibaldi <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 /> 3 Prepared and submitted site closure 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 W-1 A, W-2, W-2A, W-2B, 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 56 83 to 59 48 feet below ground surface _ <br /> Groundwater Gradient SW-NE @ 0 0098 to 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 laboratory <br /> with the following limitations <br /> • The elevated reporting limits reported in the Method 8260 analysis of sample W-2 were due to sample <br /> foaming <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl <br /> . tert-butyl ether(MtBE) and tert-butyl alcohol (TBA) were reported in groundwater samples collected from site wells <br /> this quarter All other anlaytes were reported as below laboratory detection limits Analyte concentrations were <br /> K%Wprotes V5 BP ARC0%00434%Quar1erW QTR 03'A34 GWMR 2Q03 doc Page 1 <br />