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GROUND ZERO ANALYSIS, INC, <br /> r�4 <br /> 1714 Main Street <br /> Escalon, California 95320-1927 Imo])ILC <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 AUG 2 0 z 0 01 <br /> ENVIRONMIENT HEALTH <br /> August 17, 2001 PERMIT/SERVICES <br /> Mr Michael Infurna <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> 304 E Weber Ave, Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2001 Groundwater Monitoring and Sampling Report <br /> Woolsey Oil, Inc Cardlock Facility <br /> 1501 W Charter Way, Stockton, CA(site code 508175) <br /> Dear Mr Infurna <br /> This letter report presents the results of the third 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 all 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), gasoline oxygenate additives, 1,2 dichloroethane(1,2 DCA), and ethylene dibromide (EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On August 7, 2001, monitonng wells MW1 through MW3 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 140 feet <br /> since last monitored on May 16, 2001 Groundwater flow was in a southeasterly direction with a <br /> hydraulic gradient of approximately 0 005 ft/ft A potentiometnc surface map generated using the <br /> August 7, 2001 monitoring data is depicted on Figure 2 Groundwater monitoring data are <br /> summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> W oo�ey chAgmA3gm2001 doc <br />