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.f <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9$88 <br /> Facsimile (209)$38-9883 <br /> May 29, 2003 MAY 3 0 2003 <br /> Mr Michael Infurna, ENVIRONMENT HEALTH <br /> a PERMIT/SERVICESSan Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2003 Groundwater Monitoring and Sampling Report <br /> Former Harry's Auto Mart, <br /> 2662 N Wilson Way, Stockton, CA (Site Code 1306) <br /> Dear Mr Infurna <br /> This letter report presents the results of the second quarter 2003 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations and purging and sampling <br /> groundwater from all site wells In addition, sample splits were collected from offsite U-Haul <br /> wells MW3C, MW613, MW6C, MW913, MW10B and MW10C All samples were analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), gasoline oxygenate additives, 1,2-dichloroethane (1,2-DCA), and ethylene dibromide <br /> (EDB) <br /> FIELDWORK <br /> Groundwater Monitoring <br /> On May 5, 2003, water levels in wells MW1 through MW4 and U-Haul well MW7 were <br /> monitored Groundwater elevations were calculated by measuring the depth to groundwater in <br /> each well and subtracting from the respective wellhead elevations Depth to water in the site <br /> wells ranged from 49 11 to 50 84 feet below ground surface (bgs) Groundwater rose an <br /> average of 1 34 feet since last measured on March 18, 2003 The hydraulic gradient at the site <br /> averaged approximately 0 002 feet/foot In a southerly direction <br /> A potentiometric surface map generated using the May 5, 2003 groundwater monitoring data is <br /> shown on Figure 2 Groundwater monitoring data are summarized in Table 1 Monitoring <br /> data sheets are included in Attachment A <br /> 11GZA—FSIVOL-11DATAIGROUNDZE1HARRYS\Reports\QMR1200312QM2003 doc <br />