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FILE • GROUND ZERO ANALYSIS, INC. 1714 Main, Street Fscalon, California 95320-1927 - Telephone: (209)838-9888 Facsimile: (209)838-9883 > fel . S ti . . 4 June 23, 2000 —� Mr. Ran Rowe cSt San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject: Groundwater Monitoring and Sampling Report and Request for Case Closure Former Valley Volkswagen, 647 E. Miner Ave., Stockton, CA (Figure 1) Site Code: 1187 i Dear Mr. Rowe: Ground Zero Analysis, Inc. (Ground Zero) is submitting this groundwater monitoring and sampling report for the above referenced site on behalf of Mr. Jay Friedman. This report documents the most recent groundwater quality data for the site, presents information on groundwater flow and provides a rationale for case closure. Field Activities Activities included surveying and monitoring the water level in well MWI, purging and sampling groundwater from the well, and analyzing samples for total petroleum hydrocarbons as gasoline O?Hg), benzene, toluene, ethylbenzene, xylenes (BTEX), gasoline oxygenate additives, and volatile organic compounds (VOCs). The location of MWl is shown on Figure 2. On May 18, 2000, depth to water in well MW 1 was measured in conjunction with quarterly field work conducted by IT-EMCON at the adjacent 601 East Miner Avenue site. On May 31, 2000, depth to water in well MW I was measured, and well MW 1 was surveyed and tied into an existing well (MW5) from the 601 East Miner Avenue site. Water levels in well MW 1 were 27.42 feet below ground surface bgs and 27.34 feet bgs, on May 18 and May 31, respectively. Groundwater elevations were calculated by subtracting the depth to water in the wells from the respective wellhead elevations. Groundwater flow was in a easterly direction with a hydraulic gradient of approximately 0.0035 ft/ft. A potentiometric surface map generated from the May 18, 2000 data &roun&ckvnHcyvWk2gnC 0