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Date September 21, 1999 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Pinnacle/Mark Capps <br /> Consultant Project No 791687 <br /> Primary Agency/Regulatory ID No Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 1999) <br /> i <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-6 for laboratory <br /> analysis <br /> i <br /> 2 Pinnacle compiled and evaluated groundwater monitoring data <br /> 3 Remediation system installation was conducted <br /> WORK PROPOSED FOR NEXT QUARTER (Third 1999) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for September 1999 Monitoring wells MW-1 through MW-6 will be <br /> sampled and analyzed for total petroleum hydrocarbons as gasoline using USEPA Method 8015 <br /> modified, and for benzene, toluene, ethylbenzene, and total xylenes, and methyl tert-butyl ether <br /> (MTBE) using USEPA Method 8020 <br /> 2 Upon PG&E power drop insulation, the remediation system will be started <br /> Current Phase of Project Monitoring/ARemediation <br /> Frequency of Groundwater Sampling Wells MW-1 through MW-6= Quarterly <br /> Frequency of Groundwater Monitoring _Quarterly <br /> Sampling Date June 28, 1999 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 25 59 to 27 66 <br /> Direction of Groundwater Flow Southeast <br /> Groundwater Gradient 0 002 ft/ft <br /> DISCUSSION: <br /> CF1C1Archive\Awo10549\Qtrly1054BQ299 DOC-98Usg 1 �� <br />