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T l <br /> C ' <br /> GROUND ZERO ANALYSIS, INC. - , <br /> 1714 Main Street 77-) <br /> Escalon,California 95320-1927 <br /> Telephone. (209)838-9888 <br /> Facsimile. (209)838-9883 <br /> co - <br /> November 21,2000 <br /> Mr MrchaelInfurna <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> 304 E Weber Ave,Third Floor <br /> Stockton,CA 95202 <br /> Subject Fourth Quarter 2000 Groundwater Monitoring and Sampling Report <br /> Woolsey Oil,Inc Cardlock <br /> 1501 W Charter Way, Stockton, CA(site code 508175) <br /> Dear Mr hdi ma <br /> This letter report presents the results of the fourth quarter 2000 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 from <br /> site wells Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), total <br /> petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, total xylenes (BTEX), gasoline <br /> oxygenate additives, 1,2 dichloroethane(1,2 DCA),and ethylene dnbromnde(EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On November 3, 2000 monitoring wells MW 1 through MW3 were monitored and sampled Groundwater <br /> elevations were calculated by measuring the depth to groundwater m each well and subtracting from the <br /> respective wellhead elevation. Groundwater at the site fell an average of 0 30 feet since last monitored on <br /> August 21, 2000 Groundwater flow was in a northwesterly direction with a hydraulic gradient of <br /> approximately 0 009$/h3 A potentnometnc surface map generated using the November 3, 2000 monitoring <br /> data is depicted in Figure 2 Groundwater monitoring data are summarized in Table 1 Morutonng data <br /> sheets are included in Attachment A <br /> --lacy chNcmA4gm2000 doc <br />