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AUG 3 0 Z004 GROUND ZERO ANALYSIS, INC. ENVIRONWItNj ttl-1:Ll SE4�ViC�S 1714 Main Street Escalon, California 95320-1927 Telephone (209)838-9888 Faesumde (209)838-9883 August 27, 2004 Mr Michael Infurna San Joaquin County Environmental Health Department 304 E Weber Ave , Third Floor Stockton, CA 95202 Subject Third Quarter 2004 Groundwater Monitoring and Sampling Report Valley Pacific Petroleum Services, Inc (Woolsey Oil, Inc) Cardlock Facility 1501 W Charter Way, Stockton, CA(Site Code 508175) Dear Mr Inf ima This letter report presents the results of the third quarter 2004 groundwater monitoring and sampling activities at the subject site (Figure 1) Site Activities Activities at the site included monitoring water level elevations, purging and sampling groundwater from all site wells Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, total xylenes (BTEX) and gasoline oxygenate additives Fieldwork On August 6, 2004, monitoring wells MW 1 through MW5 were monitored and sampled Groundwater elevations were calculated by measuring the depth to groundwater in each well and subtracting from the respective wellhead elevation Groundwater elevations at the site fell an average of 1 57 feet since last monitored on May 11, 2004 The average hydraulic gradient across the site was approximately 0 007 ft/ft Groundwater flow was toward the northeast A potentiometric surface map generated using the August 6, 2004 monitoring data is depicted on Figure 2 Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are included in Attachment A Prior to sampling, monitoring wells MW 1 through MW5 were purged of a minimum of three well casing volumes During the purging process, temperature, pH and electrical conductivity parameters were measured \\GZA_FSIVOL I%DATAIGROUNDZEIWOOLSEY CH RQW2004%3QM2004 doc-