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yi <br /> ('W„ Date July 30,2003 <br /> Quarter: 2nd Quarter,2003 <br /> . ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2168 <br /> Address 411 Charter Way, Stockton, CA <br /> ARCO Environmental Engineer- _Kyle Christie - <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466079 00436 <br /> Primary Regulatory Agency San Joaquin County Environmental Health Department <br /> WORK PERFORMED THIS QUARTER (Second 2003) <br /> 1 Performed quarterly groundwater monitoring and sampling MW-1, MW-1B, MW-IC, and MW-2 were not <br /> monitored or sampled because the wells were covered by soil and debris <br /> 2 Prepared and subnutted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2003): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and subrnit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Second 2003): <br /> . Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1, MW-1 B, MW-1 C, MW-2, MW-3, MW-4, MW-5, <br /> MW-6, MW-7, MW-8, MW-813, MW-8C Sampled <br /> Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 20 58 to 24 81 <br /> Groundwater Flow and Gradient East to Northeast @ 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 limitations <br /> • The elevated reporting limits reported in the Method 8260 analysis of samples MW-3, MW-4, MW-6, and <br /> MW-7 were due to the presence of TPHg in these samples <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl <br /> tert-butyl ether(MtBE), and 1,2-dichloroethane(1,2-DCA)were detected in groundwater samples collected from site <br /> wells this quarter Analyte concentrations were generally consistent with historical data Groundwater elevations <br /> across the site increased relative to the previous quarter The inferred direction of groundwater flow and average <br /> . hydraulic gradient were consistent with previous monitoring events <br /> K XWRov ssVS BP ARCQWiWQLwt"\2 QTR WV2168 GWMR 2Q03 doc Page 1 <br />