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�4 rpi ik Ji�l'�a r11/' 1 <br /> �^ rJ 1u 4 ,�r " 1 iH <br /> GROUND ZERO ANALYSIS, INC. J r , t �,_�e,�t,� _ <br /> 1714 Maui Street p ix P11 <br /> Fscalon,California 95320-1927 2: 2.5 <br /> Telephone (209)838-9888 <br /> Facsunde (209)838-9883 <br /> May 20, 2004 <br /> Mr Michael Infurna <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2004 Groundwater Monitoring and Sampling Report <br /> Valley Pacific Petroleum Services, Inc (Woolsey Oil, Inc ) Cardlock Facility <br /> 1501 W Charter Way, Stockton, CA (Site Code 508175) <br /> Dear Mr Infuma <br /> This letter report presents the results of the second quarter 2004 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) <br /> Site Activities <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater <br /> from all site wells Groundwater samples were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX) and gasoline oxygenate additives <br /> Fieldwork <br /> On May 11, 2004, monitoring wells MW1 through MW5 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 elevations at the site rose an <br /> average of 0 24 feet since last monitored on February 12, 2004 The average hydraulic gradient <br /> across the site was approximately 0 003 ft/ft Groundwater flow was toward the northeast A <br /> potentiometric surface map generated using the May 11, 2004 monitoring data is depicted on Figure <br /> F 2 Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are included in <br /> Attachment A <br /> • <br /> IIGZA_FSIVOL_11DATA1GROUNL)ZE1WOOLSEY CHTIQMR1200412QM2004 doc <br />