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'�E(UE <br /> GROUND ZERO ANALYSIS, INC. §VED <br /> • 1714 Main Street 7 2006 <br /> Escalon, California 95320-1927 ENVIRON <br /> Facsimile (209)838-9883 Telephone (209)838-9888PEh'MITIS 8 NEALTH <br /> ES <br /> January 13, 2006 <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 Fourth Quarter 2005 Groundwater Monitoring and Sampling Report <br /> Valley Pacific Petroleum Services, Inc (Woolsey 011,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 fourth quarter 2005 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, and purging and sampling <br /> groundwater from all site wells Groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, <br /> ethylbenzene, total xylenes (BTEX), and gasoline oxygenates and additives <br /> Fieldwork <br /> On December 19, 2005, 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 fell by an <br /> average of 0 87 feet since last monitored on August 24, 2005 Groundwater flow was generally <br /> toward the west at a hydraulic gradient of approximately 0 004 — 0 007 ft/ft A potentiometric <br /> surface map created from the December 19, 2005 monitoring data is depicted on Figure 2 <br /> Groundwater elevation data are summarized in Table 1 Monitoring data sheets are included in <br /> Attachment A <br /> Prior to sampling, monitoring wells MW1 through MW5 were purged of a minimum of three well <br /> casing volumes During the purging process, temperature, pH and electrical conductivity <br /> . parameters were measured <br /> G 1GROUNDZEIWOOLSEY CHTIQMR1200514QM2005 doc <br />