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I <br /> GROUND ZERO ANALYSIS, INC. <br />' 1714 Maui Street <br /> 9 2004 <br /> Esealon,CaMorma 9520-1927 ENViRUI' VIEId I rJLALTH <br /> Telephone (209)838-98ss PERMIT/SERVICES <br /> Facsunde (209)838-9$83 <br /> I <br />' November 5, 2004 <br />' Mr Jeff Wong <br /> San Joaquin County <br />' Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br />' Subject Quarterly Groundwater Monitoring Report,July through September 2004 <br /> Including Groundwater Treatment System Status and Installation of <br />' Groundwater Monitoring/Groundwater Extraction Well EW2 <br /> Speedy Mart, 8200 N Highway 99, Morada, CA <br /> Dear Mr Wong <br /> This letter report summarizes the third quarter 2004 groundwater monitoring, sampling, and <br />' remediation activities at the subject site Figure 1 presents a site vicinity map <br />' 1.0 SITE ACTIVITIES <br /> Activities at the site included operation and maintenance of the groundwater extraction and <br />' treatment system, the installation of a new groundwater monitoring/groundwater extraction well, <br /> conducting routine quarterly groundwater monitoring and sampling of site wells, analyzing <br /> groundwater and treatment system samples for appropriate constituents of concern, and <br />' collecting groundwater samples from nearby domestic wells <br />' 2.0 GROUNDWATER EXTRACTION AND TREATMENT SYSTEM <br /> The interim groundwater extraction and treatment system operated for all or portions of 49 days <br />' during the reporting period The system operated continuous from July 1 through July 25 2004, <br /> when it shut down automatically because the fluid level in the extraction well fell to below the level <br /> switches The air stripper and associated interlocks were installed between July 30 and August 23, <br /> 2004 The treatment system with the integrated air stripper, was restarted on August 24, 2004 The <br /> system operated intermittently between August 24 and August 31, 2004 due to difficulties with <br /> water flow meters A new meter was installed to monitor the system effluent and the system <br />' G 1GROUNDZEITULEBURG1ReportslQMR1200413QM2004 doc <br />