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Date May 15, 2003 <br /> Quarter 1$i Quarter,2003 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 4493 <br /> Address 205 N Center St , Stockton, CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth _ <br /> Consultant Project No 38466104 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> Assembly Bill 681 Status Propeowned by Ci of Stockton <br /> WORK PERFORMED THIS QUARTER (First 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2003): <br /> 1 Conduct quarterly groundwater monitoring and sampling , <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Obtain permits for further assessment work <br /> . 4 Schedule further assessment work <br /> QUARTERLY RESULTS SUMMARY (First 2003): <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater MW-1 through MW-11 1 D sampled quarterly <br /> Frequency of Groundwater Quarterly <br /> Is Free Product (FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 14 00 to 20 41 ft <br /> Groundwater Flow and Gradient Northeast @ 0 013 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the electronic 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 reported results for methyl tert-butyl ether (MtBE) and total petroleum hydrocarbons as gasoline <br /> (TPHg) in sample MW-8D should be considered estimated due to a high relative percent difference <br /> reported between the associated MS and MSD <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> . analyte <br /> K1Wp,oc.95 BP ARC0Z4443VX.U,1y11 QTR 0314493 GWMR 1Q03 doc Page 1 <br />