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Date: October 27,2003 <br /> Quartet' Yd Quarter,2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2186 <br /> Address 3212 North California Street, Stockton, CA <br /> ARCO Environmental Engineer _Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466266 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> (SJCEHD) _ <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Third 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Submmtted the Corrective Action Plan on September 19,2003,waiting for County approval <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2003): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> . 3 Begin design and construction of SVE with air sparge system following County approval of CAP taj �V <br /> QUARTERLY RESULTS SUMMARY (Third 2003): 1 A ' <br /> a <br /> i <br /> Current Phase of Project Monitoring i A <br /> Frequency of Groundwater Sampling MW-1 through MW-7, and VW-1A through VW-313 5' <br /> sampled quarterly 'i'y'— <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques Natural attenuation/SVE with air sparge proposed <br /> Approximate Depth to Groundwater 50 64 to 52 15 feet below ground surface T <br /> Groundwater Gradient Northeast @ 0 005 ft/ft <br /> ANALYTICAL DATA REVIEW: <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 lirrutations <br /> • The reported results for total petroleum hydrocarbons as gasoline(TPHg) in samples MW-4,VW-1B,VW- <br /> 2B, and VW-3B are due to a discrete peat at C5 (probably MtBE)and have been refected <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> • analyte(s) <br /> K 1Wpmccss115 BP ARC01021861QuanerW QTR 0312166 GWMR 3Q03 doc Page 1 <br />