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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street u i ' P` , <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile- (209)838-9883 <br /> 4 <br /> May 9, 2000 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Site Status Report, First Quarter 2000 <br /> Knowles Property, 1140 W Hammer Lane, Stockton, California <br /> Dear Mr Knoll <br /> This report summarizes activities at the subject site (Figure 1) between January 1, 2000 and <br /> March 31, 2000 Activities during the quarter included monitoring depth to water in all site wells, <br /> purging and sampling wells MW1, MW3, MW4, MWS, and MW8, analyzing samples for <br /> benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons as <br /> gasoline (TPHg), and disposing of purged groundwater stored at the site <br /> GROUNDWATER MONITORING <br /> An experienced Ground Zero Analysis, Inc (Ground Zero) technician measured the depth to <br /> groundwater in each site well on February 8, 2000 The depth to groundwater beneath the site <br /> ranged from 3101 feet below ground surface (bgs) in well MW3 to 33 11 feet bgs in well MW6 <br /> Overall groundwater elevations rose an average of 3 55 feet between November 8, 1999 anhd <br /> February 8, 2000 The water table beneath the site lies above the scr6& d iritei�als'for fall wells <br /> except MW3 Monitoring well construction details are summarized in Table 1 Tlfkgroundwater , <br /> flow at the time of measurement was generally to the southeast at gradient of 0 006 ft/ft A <br /> potentiometric surface map for February 8, 2000 is presented on Figure 2 Groundwater <br /> monitoring data are summarized in Table 2 <br /> GROUNDWATER SAMPLING AND ANALYSIS <br /> Monitoring wells MW 1, MW3, MW4, MWS, and MW8 were sampled on February 8, 2000 A <br /> minimum of three well casing volumes of water was"purged from each well prior to sampling <br /> The temperature, specific conductance, and pH of the water were meas& dl aild recordedrt le <br /> each well was purged of the required volume Purged groundwater was placed in labeled dr["g <br /> koawles ham/reporGs/1 gm2000 doc <br /> AI <br />