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GROUND ZERO ANALYSIS, INC. 1 , , 1714 Main Street ,, Z �, Escalon, Caldornia 95320 Telephone: (209)838-980 Fwsixnde: (209)838-9883 January 14, 1998 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject Fourth Quarter 1997 Site Status Report Knowles Property 1140 W Hammer Lane, Stockton, California Dear Mr Knoll This letter report summarizes fourth quarter 1997 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, MW4, MW5, and MW8, and analyzing samples for total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, total xylenes(BTEX), and oxygenate compounds GROUNDWATER MONITORING Groundwater monitoring was performed on November 6, 1997 The depth to groundwater beneath the site ranged from 39 97 to 42 03 feet below grade Overall, groundwater elevations rose an average of 0 71 feet since August 13, 1997 The groundwater flow direction at the time of measurement was generally to the southeast with a hydraulic gradient of approximately 0 006 to 0 01 feet per foot (approximately 32-53 feet per mule) A groundwater gradient map for November 6, 1997 is presented on Figure 2 Groundwater monitoring data are summarized in Table 1 GROUNDWATER SAMPLING AND ANALYSIS Monitoring wells MW1, MW4, MW5, and MW8 were purged and sampled on November 6, 1997 All purge water was contained on site in labeled drums approved by the Department of Transportation for storage of liquid waste Well purge logs are included in Attachment A Groundwater samples were submitted to Argon Laboratories (ELAP #1873) and analyzed for TPHG, BTEX, and oxygenate compounds using EPA methods 8015 modified, 8020, and 8260, respectively groumduUmowles bnmlreporta14gm1997 doc