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r S E C 0 R . Date July 15, 2003 Quarter 2Q03 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 4932 Address 16 E Harding Way, Stockton, CA i ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person SECORIRusty Benkosky i Consultant Project No 77BP 54932 03 0336 Primary Agency/Regulatory ID No San Joaquin County Public Health Services (SJCPHS) Assembly Bill 681 Status Property owned by ARCO I I WORK PERFORMED THIS QUARTER (Second Quarter - 2003): 1 Performed quarterly groundwater monitoring and sampling 2 Prepared and submitted quarterly groundwater monitoring report 3 Completed construction and began operation of soil vapor extraction and groundwater extraction remedial system WORK PROPOSED FOR NEXT QUARTER (Third Quarter - 2003) 1 Perform quarterly groundwater monitoring and sampling 2 Prepare and submit quarterly groundwater monitoring report 3 Install off-site extraction wells and connect the newly installed wells to the remediation system QUARTERLY RESULTS SUMMARY Current Phase of Project Monitoring/Remediation Frequency of Groundwater MW-1 through MW-11, EW-1, EW-2, EW-6, DMW-1 through DMW-3 and SVE-1 Sampled quarterly Frequency of Groundwater Quarterly Is Free Product(FP) Present Onsite No Current Remediation Techniques SVE/GWE Approximate Depth to Groundwater 29 06—30 46 ft Groundwater Flow and Gradient Shallow-Northeast @ 0 005 ft/ft Deep— Northeast @ 0 007 fUft DISCUSSION. Total petroleum hydrocarbons as gasoline (TPHg) were reported in four of the eleven wells sampled this quarter at concentrations ranging from 95 ppb (MW-9) to 51,000 ppb (EW-2) Benzene was reported in one of the eleven wells at a concentration of 34 ppb (MW-3) Methyl tert-butyl ether(MtBE), analyzed using EPA Method 8260B,was reported in seven of the eleven wells at concentrations ranging from 0 76 ppb (DMW-2) {� to 55,000 ppb (EW-2) 1,2-Dichloroethane (1,2-DCA) was reported in five of the wells at concentrations ranging from 0 72 ppb (MW-9) to 10 ppb (MW-5) Di-isopropyl ether (DIPE) was reported in one well at a concentration of 1 3 ppb in well DMW-1 Tert-butyl alcohol (TBA), tert-amyl methyl ether (TAME), ethylene 11ARC0149321Q1V1Rs1200312QMR03 doc -2.