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Date July 14,2004 <br /> Quarter 2°d Quarter,2004 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd, Tracy, 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 San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Second 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Second 2004): <br /> • Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling AMW-1 through AMW-6, MW-1 through MW-8 Quarter) <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 72 to 7 23 feet below ground surface _ <br /> Direction of Groundwater Flow Northwest <br /> Groundwater Gradient 0 005 feet/foot <br /> ANALYTICAL DATA REVIEW: <br /> Please note that as of April 1, 2004, the Iaboratory has changed the carbon range for gasoline range organics (GRO) <br /> from C5 -- C10 to C4 — C12 (to include the oxygenates) The resulting data may be impacted by the potential <br /> inclusion of additional total petroleum hydrocarbons as gasoline (TPHg) and non-TPHg analytes within the revised <br /> carbon range, which may result in a higher reported concentration Where the resulting GRO concentration is based <br /> on a single analyte(i e,a non-TPHg analyte or a single TPHg analyte),the analyte will 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 <br /> K\Wpa,eessVS RP ARCOII 11941Quw1er1y12 QTR 04111144 GWMR 2QO4 doc Page 1 <br />