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; e <br /> Date May 18, 1998 <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 20805-140 008 <br /> Primary Agency/Regulatory ID No Mike Infurna, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1998) <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-6 for laboratory <br /> analysis <br /> 2 Pinnacle compiled and evaluated groundwater monitoring data <br /> 3 The underground storage tanks were removed from the site on February 10, 1998 Details of the tank <br /> removal will be presented in a separate report <br /> WORK PROPOSED FOR NEXT QUARTER (Second 1998) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for June 1998 Groundwater samples will be collected and analyzed for <br /> total petroleum hydrocarbons as gasoline using U S Environmental Protection Agency (USEPA) <br /> Method 8015 modified, and for benzene, toluene, ethylbenzene, and total xylenes and methyl tert- <br /> butyl ether (MTBE) using USEPA Method 8020 A letter concerning oxygenate sampling of wells at <br /> this site was sent to the San Joaquin County Public Health Services along with the Tank Removal <br /> Report on May 4, 1998 We will await comment on this letter prior to sampling for the second quarter <br /> 1998 <br /> 2 Pinnacle will prepare and submit a report detailing the results of laboratory analyses of soil samples <br /> collected during tank removal <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling Wells MW-1 through MW-6 = <br /> Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date February 16, 1998 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> SAC1N\P1010805108051400 8AS-981??? 1 <br />