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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> May 15, 2002 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject First Quarter 2002 Groundwater Monitoring and Sampling Report <br /> Former M&K Market, 8960 West Walnut Grove Rd, Thornton California <br /> Dear Mr Knoll <br /> This letter report presents the results of the first quarter 2002 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> 1.0 SITE ACTIVITIES <br /> Activities at the site included surveying all site wells pursuant to AB2886, monitoring water level <br /> elevations, and purging and sampling groundwater from site wells Groundwater samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX), oxygenated gasoline additives, 1,2-dichloroethane (1,2-DCA), and ethylene <br /> dibromide (EDB) <br /> 2.0 FIELDWORK <br /> 2.1 Monitoring Well Survey <br /> As required by AB 2886, all monitoring wells were surveyed by a Registered Surveyor to a <br /> horizontal accuracy of less than one meter and a vertical accuracy of 0 01 feet In February 2002, <br /> Morrow Surveying surveyed the latitude and longitude of the site wells relative to the North <br /> American Datum (NAD83) Wellhead elevations were surveyed relative to assumed NAVD88 <br /> data compiled from GPS observations A site map showing monitoring well locations, latitude <br /> and longitude coordinates and wellhead elevations is included in Attachment A <br /> bamyardheportslgmr/1QM2002 doc <br />