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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-98 D <br /> Factiimlle (209)838-98833 �W Fc�DD <br /> FEB 13 2002 <br /> February 11, 2002 ENVikul- ' l V 'H <br /> PERMIT/SERVi;.i,S <br /> Mr Harlan 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 Fourth Quarter 2001 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 fourth quarter 2001 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations and purging and sampling groundwater <br /> from site wells Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), oxygenated gasoline additives, 1,2-dichloro ethane (1,2-DCA), and ethylene dibromide <br /> (EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On December 13, 2001, monitoring wells MW 1 through MW4 were monitored and sampled <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each well and <br /> subtracting from the respective wellhead elevation Groundwater at the site fell an average of 0 97 feet <br /> since last monitored in September 2001 Groundwater flowed to the northwest at a hydraulic gradient <br /> of approximately 0 0008 ft/ft, or approximately 4 2 feet per mile A potentiometric surface map <br /> generated using the December 13, 2001 monitoring data is depicted on Figui e 2 Gi oundwatei <br /> monitoring data are summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> barny3rd/repofts/grnr/4QM200 i dog <br />