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Date July 16,2004 <br />■i r [_ Quarter 2°d 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 OL05$ <br /> Primary Regulatory Agency San Joaquin CountyEnvironmental Health De artment <br /> Assembly Bill 681 Status Property owned by Mr Bill Halverson <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-1, MW-11B, MW-1C, MW-2, MW-3, MW-4, MW-5, <br /> MW-6, MW-7, MW-8, MW-8B, 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 76 to 25 20 feet below ground surface <br /> Groundwater Flow and Gradient Northeast to East-Southeast 0 0 001 to 0 002 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 — 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\ftr ssV5 BP ARC0\02168VQuu wy1yl2 QTR 0412168 GWNIR 2Q04 do Page 1 <br />