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Date April 29,2004 <br /> Quarter I"Quarter,2004 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd,Trac , CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466552 OL058 <br /> Primary Agency/Regulatory ID No Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> Assembly Bill 661 Status Property owned by Conoco Phillips <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 submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (First 2004): <br /> • Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling AMW-1 through AMW-6, MW-1 through MW-8 Quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 4 50 to 7 20 feet below ground surface <br /> Direction of Groundwater Flow Northwest <br /> Groundwater Gradient 0 009 feet/toot <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 /> LCSILCSD results,MS/MSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following Iimitations <br /> • The reported result for toluene in sample MW-6 may be biased low due to a low average percent recovery <br /> reported in the associated MS/MSD analysis <br /> • - Elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a target <br /> analyte(s) <br /> K%Wp,0ce0J5 BP ARCM111941QuartffbAl QTR 04N11394 GWMR 3Q04 dw Page 1 <br />