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a , <br /> Date February 12, 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 20805-140 008 <br /> Primary Agency/Regulatory 1D No Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 1998). <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-3, MW-5, and MW-6 <br /> for laboratory analysis No-purge samples from vapor wells VW-1 through VW-4 were collected from <br /> elevation of water-table impacts as proposed in the August 10, 1998 Workplan for Onsite Well <br /> Installation Activities <br /> . 2 Pinnacle compiled and evaluated groundwater monitoring data <br /> A letter concerning oxygenate sampling of wells at this site was sent to the San Joaquin County Public <br /> Health Services (SJCPHS) along with the Tank Removal Report on May 4, 1998 The SJCPHS letter <br /> dated June 18, 1998, allowed analysis of samples from current monitoring wells using U S <br /> Environmental Protection Agency (USEPA) Method 8020 After installation of any new on-site or off- <br /> site wells, SJCPHS will require oxygenate analysis using USEPA Method 8260 <br /> 3 Pinnacle conducted on-site drilling and installation of airsparge wells AS-1, AS-2 and AS-3 and <br /> installation of vapor extraction wells VW-5S and VW-5D in October 1998 Results of drilling activities <br /> will be evaluated with respect to lateral and vertical extent of soil and groundwater impacts <br /> WORK PROPOSED FOR NEXT QUARTER (First 1999) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for March 1999 Monitoring wells MWA through MW-6 will be sampled <br /> and analyzed for total petroleum hydrocarbons as gasoline using USEPA Method 8015 modified, and <br /> for benzene, toluene, ethylbenzene, and total xylenes and methyl Cert-butyl ether (MTBE) using <br /> USEPA Method 8020 <br /> 2 Pinnacle will continue with design of future remediation system for the site and select contractor for <br /> system installation <br /> CPRE 1ARCO\0548\QTRLY\0548Q498 DOC-9811sg i <br />