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i- <br /> GROUND ZERO ANALYSIS, INC. v r <br /> Y ?- <br /> 1714 Maul Street U ` <br /> Escalon,California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> September 7,2000 <br /> Mr Michaellnfurna <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 2000 Groundwater Monitoring and Sampling Report <br /> Woolsey Oil,Inc Cardlock <br /> 1501 W Charter Way, Stockton, CA(site code 508175) <br /> Dear Mr Inf ima <br /> This letter report presents the results of the third quarter 2000 groundwater monitoring and sampling <br /> activities at the subject site(Figure 1) <br /> SITE ACTNITI ES <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 dhchloroethane(1,2 DCA), and ethylene chbromide(EDB) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On August 21, 2000, monitoring wells MW 1 through MW3 were monitored and sampled Groundwater <br /> elevations were calculated by measuring the depth to groundwater in each well and subtracting from the <br /> respective wellhead elevation Groundwater fell an average of 1 81 feet since last monitored on May 24, <br /> 2000 Groundwater flow was in a southeasterly direction with a hydraulic gradient of approximately 0 006 <br /> ft/ft A potentiometric surface map generated using the August 21, 2000 monitoring data is depicted in <br /> Figure 2 Groundwater monitoring data are summarized in Table 1 Monrtormg data sheets are included in <br /> Attachment A <br /> wookey chtlginr13gm2000 doc <br />