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Date October 20,2003 <br /> Quarter 3'0 Quarter,2003 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 760 <br /> Address 225 South Cherokee Lane, Lodi, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466244 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County <br /> Assembly Bill 681 Status Prop"Owned by Gur reet Dhatt and Kuldeep Dhatt <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 /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2003): <br /> I Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and subrmt quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Third 2003): <br /> Current Phase of Project Monitoring <br /> Fre uenc of Groundwater Sampling MW-1 through MW-3 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Is Free Product FP Present Onsite No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date None <br /> Current Remediation Techniques None <br /> Approximate Depth to Groundwater 59 82—61 17 feet below ground surface <br /> Groundwater Flow and Gradient Southeast @ 0 013 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 <br /> laboratory <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg),benzene,xylenes(total),methyl tert-butyl ether(MtBE),and 1,2- <br /> drehloroethane (1,2-DCA) were reported above method detection limits to groundwater samples collected from site <br /> wells this quarter TPHg, benzene, xylenes (total), and MtBE concentrations increased in MW-2 relative to those <br /> reported during the previous sampling event 1,2-DCA concentrations increased in MW-1, MW-2, and MW-3 this <br /> quarter but remain within historic ranges Groundwater elevations in site wells decreased relative to the previous <br /> monitoring event The inferred groundwater flow direction was to the southeast at an average hydraulic gradient of <br /> 0 013 feet/foot <br /> i <br /> K MPP cess\J5 gP ARC0\00760lQumer1y0 QTR 031760 G\VMR 3Q03 do Page 1 <br />