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Date January 30, 2002 <br /> Quarter 4Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 595 Address 6100 N Highway 99,Stockton,CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Project No 077 43130 704 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services <br /> (SJCPHS) <br /> Assembly Bill 681 Status Property owned by Madeline Scannavino <br /> WORK PERFORMED THIS QUARTER (Fourth Quarter- 2001): <br /> 1 Performed groundwater monitoring and sampling(including onsite water supply well,WSW) <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Prepared and submitted"Site Assessment Report"(SECOR,December 11,200 1) <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter - 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling(including WSW) <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Obtain access agreements and sample domestic wells DW-I and DW-2 <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-I through MW-7 and WSW-1 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques NA <br /> Approximate Depth to Groundwater 593/4 to 64'2 ft <br /> Groundwater Flow and Gradient Northwest Ca 0 002 ft/ft <br /> DISCUSSION: <br /> Well MW-4 was dry this quarter Total petroleum hydrocarbons as gasoline(TPHg) were reported in three of the <br /> six monitoring wells sampled this quarter at concentrations ranging from 130 ppb(MW-3)to 770 ppb(MW-1) <br /> Benzene was reported in one monitoring well at a concentration of 57 ppb(MW-2) Methyl tert-butyl ether(MtBE), <br /> analyzed using EPA Method 8260B,was detected in four of the six monitoring wells at concentrations ranging from <br /> 3 7 ppb(MW-1)to 100 ppb(MW-7) 1,2-dichloroethane(1,2-DCA)was reported in four of the six monitoring <br />