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Date July 30,2003 <br /> Quarter 2"d 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 URSNemon 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 Property owned by City of Stockton <br /> WORK PERFORMED THIS QUARTER (Second 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2003): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> 2 Prepare and subrrut quarterly groundwater monitoring report <br /> 3 Conduct additional assessment to evaluate lateral and vertical extent of petroleum impacted groundwater <br /> QUARTERLY RESULTS SUMMARY (Second 2003): <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling MW-1 through MW-11 D 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 13 20 to 20 39 ft <br /> Groundwater Flow and Gradient Northeast 0 0 01 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 aromatic compounds at MW-10M should be considered estimated since there was <br /> insufficient preservative to reduce the sample pH to less than 2 <br /> • The reported results for HVOCs at MW-5,MW-6,MW-7, and MW-SM should be considered estimated <br /> due to headspace in the vial <br /> • The reported results for TPHg in samples MW-2 and MW-5 are due to a discrete peak in the C5-C6 range <br /> . (MtBE),as a result the TPHg identification has been rejected <br /> K SWPmoessli5 BP ARC01044931Quarser1y%2 QTR 6314493 CWMR 2Q03 doc Page 1 <br />