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Date: July 212004 <br /> Quarter 2nd Quarter 2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6020 <br /> Address 1711 E Yosemite Ave , Manteca, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466530 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <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 MW-5 through MW-10 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present Onsite No _ <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater _21 69 to 24 66 feet below ground surface (bgs) <br /> Groundwater Flow and Gradient Northeast to Northwest @ 0 004—0 005 feet/foot (ft/ft) <br /> ANALYTICAL DATA REVIEW: <br /> Please note that as of April 1,2004, the laboratory has changed the carbon range for gasoline range organics (GRO) <br /> from C6 — CIO 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 due to dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> K MVMCrsM BP ARC01060201Q..nw1y12 QTR 0416020 GWMR 2004 do Page 1 <br />