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r - <br /> r ' <br /> . Date October 29,2001 <br /> Quarter 3Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6020 Address 1711 E Yosermte Ave , Manteca, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Project No 077 43345 703 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services(SJCPHS) <br /> Assembly Bill 681 Status Property owned by ARCO <br /> WORK PERFORMED THIS QUARTER (Third Quarter - 2001): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter - 2001): <br /> 1 Prepare quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-5 through MW-10 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> 1s Free Product(FP)Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 21-22�i ft <br /> Groundwater Flow and Gradient Northwest @ 0 002 ft/ft <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg),benzene,toluene,ethylbenzene,and xylenes(total)were <br /> reported as nondetectable in all six wells sampled this quarter Methyl tert-butyl ether(MtBE),analyzed using <br /> EPA Method 8260B,was reported in MW-6 at a concentration of 2,900 ppb Chemical concentrations are <br /> consistent with analytical data Groundwater elevations across the site decreased by an average of 129 ft <br /> Groundwater flow was to the northwest at an approximate gradient of 0 002 ft/ft <br /> This report presents our understanding of existing conditions at the subject site The conclusions contained herein <br /> are based on the analytical results,and professional Judgment in accordance with current standards of professional <br /> practice, no other warranty is expressed or implied SECOR assumes no responsibility for exploratory borings or <br /> data reported by other consultants or contractors <br />