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Y i t GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon,California 95320-1927 Telephone- (209)838-9888 Facsimile: (209)838-9883 May 6, 1999 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject First Quarter 1999 Site Status Report Knowles Property, 1140 W Hammer Lane, Stockton, California Dear Mr Knoll This report summarizes the first quarter 1999 activities at the subject site (Figure 1) Activities during the quarter included monitoring depth to water in all site wells, purging and sampling wells MW 1, MW3, MW4, MW5, and MW8, and analyzing the samples for benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) GROUNDWATER MONITORING Groundwater monitoring was performed on February 24, 1999 The depth to groundwater beneath the site ranged from 30 74 to 32 86 feet below grade Overall, groundwater elevations rose an average of 3 40 feet since November 1999 The water table beneath the site lies above the screened intervals for all wells except MW3 Monitoring well construction details are summarized in Table 1 The groundwater flow direction at the time of measurement was generally to the southeast at a gradient of 0 007 ft/ft A groundwater gradient map for February 24, 1999 is presented on Figure 2 Groundwater monitoring data are summarized in Table 2 GROUNDWATER SAMPLING AND ANALYSIS Monitoring wells MW1, MW3, MW4, MWS, and MW8 were sampled on February 24, 1999 A minimum of three well casing volumes of water was purged from each well prior to sampling The purged water is currently contained on site in labeled drums approved by the Department of Transportation (DOT) pending disposal Copies of purge logs are In Attachment A The purgewater is scheduled to be removed by vacuum truck and transported to a treatment, storage, and disposal facility (TSDF) In May 1999 Uowles harn/reports/lgm1999 doc