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r <br /> GROUND ZERO ANALYSI5, INC. <br /> 1005 FEB 22 PH 12: 33 <br /> r 1714 Maur Street <br /> Escalon, California 95320-1927 SAN JOA'C)1 J f tJ COUNT Y <br /> Telephone (209)838-9888 iD�PE ��Faesumle (209)838-9883 HEALTH �N T <br /> r <br /> rFebruary 16, 2005 <br />' Mr Jeff Wong {� 0 L <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, October through December 2004 <br /> Including Groundwater Treatment System Status <br />' Speedy Mart, 8200 N Highway 99, Morada, CA <br /> Dear Mr Wong <br /> This letter report summarizes the fourth quarter 2004 groundwater monitoring, sampling, and <br /> remediation activities at the subject site Figure 1 presents a site vicinity map <br /> 1 <br /> 1.0 SITE ACTIVITIES <br /> Activities at the site included operation and maintenance of the groundwater extraction and <br /> treatment system, conducting routine quarterly groundwater monitoring and sampling of site <br /> wells, analyzing groundwater and treatment system samples for appropriate constituents of <br /> concern, and 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 70 days <br /> during the reporting period The system was down from October 1 through October 20, 2004, <br /> when the extraction pump in well EW I (MW 1) failed A new pump was installed and the system <br /> was brought back online on October 20, 2004 The system operated continuously from October 20 <br /> through December 16, 2004, but was shut down periodically for routine maintenance and due to <br /> periodic high limit shut off on the air stripper Extraction well EW2 was brought on-line on <br /> ` November 24 ' and incorporated into the treatment system The system was temporarily shut down <br /> on December 16, 2004 to replace the Iead granular activated carbon (GAC) unit The system was <br /> back on line for a few days, but then shut down on December 20, 2004, due to the high limit switch <br /> 11GZA_FSIV OL_11DATAIGROUNDZEITULEBU RG1ReportsIQMR1200414QM2004,loc <br />