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tis <br /> Date April 26,2004 <br /> Quarter: I"Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2168 <br /> Address 411 W Charter Way, Stockton, CA <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466532 OL058 <br /> Primary Regulatory Agency San Joaquin County_Environmental Health Department <br /> WORK PERFORMED THIS QUARTER (First 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and subrmt quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (First 2004): <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-8B, MW-8C Sampled <br /> Quarter) <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 21 01 to 25 62 feet below ground surface <br /> Groundwater Flow and Gradient Southeast @ 0 004 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Please note that during 2003, the laboratory has changed Total Petroleum Hydrocarbons as Gasoline (TPHg) to <br /> Gasoline Range Organics (GRO) The resulting data may be impacted by the potential inclusion of non-TPHg <br /> analytes within the requested carbon range resulting in a higher concentration being reported Where the resulting <br /> GRO concentration is based on a single analyte (i e, a non-TPHg analyte or a single TPHg analyte),the analyte will <br /> be identified if possible <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 were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte(s) <br /> K SWPmQess515 BP ARC0%D21681Quartu1y%1 QTR 0452168 C,WMR IQ04 doe Page 1 <br />