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i <br /> GROUND ZERO ANALYSIS, INC. <br />' 1714 Maui Street <br /> Escalon, Cahfortna 95320-1927 <br /> Telephone (209)838-9888 <br /> Faesunile (209)838-9883 <br />' May 2, 2005 <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 Monitoring Report <br /> January through March 2005 <br /> Speedy Foods, 8200 N Highway 99, Morada, CA <br /> 1 <br /> Dear Mr Wong <br /> This letter report summarizes the first quarter 2005 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, conducting routine quarterly groundwater monitoring and sampling of site <br /> wells, analyzing groundwater and treatment system samples for constituents of concern, <br /> collecting groundwater samples from nearby domestic wells, installing a new vapor extraction <br /> well, and destroying groundwater monitoring well MW2 <br /> 1 <br /> 2.0 GROUNDWATER EXTRACTION AND TREATMENT SYSTEM <br /> 1 The groundwater extraction and treatment system operated for all or portions of 73 days during the <br /> reporting period With the authorization of the Regional Board, the air stripper was temporarily <br /> bypassed in early January and groundwater treatment was accomplished by pumping the water <br /> directly through the carbon units This was done because the air stripper's effluent pump failed <br /> The system operated in this fashion until January 10, 2005, when pumping was temporarily <br /> ' suspended in order to repair the effluent pump The system was restarted with the air stripper on- <br /> line on January 18, 2005 and operated with minimal down time through March 30, 2005 Periodic <br /> • maintenance included changing the particulate filters, repairing minor leaks at fittings, adjusting <br /> G 1GROUNDZEITULEBURGNReportslQMR000511QM2005 doc <br /> 1 <br />