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` J i <br /> GROUND ZERO ANALYSIS, INC. 2 � <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone (209)838-9888 ^ <br /> �E C Li <br /> Facs►mile (209)838-9883 I � TL�ff`- <br /> I <br /> DEC 17 2002 <br /> December 16, 2002 ENVIRONMENT HFALTH <br /> PERMIT/SERVICES <br /> Mr Nuel Henderson <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave , 3rd Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 2002 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California(Figure 1) <br /> Dear Mr Henderson <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork conducted <br /> at the subject site during the fourth quarter 2002 Groundwater related activities included monitoring <br /> groundwater elevations in all site wells, sampling groundwater from monitoring wells MW3 through <br /> MW6, MW8, MW10, MW1l and MW14 and sampling groundwater from vapor wells VW3, VW4 <br /> and VW6 <br /> Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene dlbromide (EDB), <br /> and gasoline oxygenate additives [methyl-tert-butyl ether (MTBE), ethyl-tert-butyl ether (ETRE), di- <br /> isopropyl ether(DIPE), tent-amyl methyl ether(TAME) and tert-butyl alcohol (TRA)] <br /> GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on November 13, 2002 m monitoring wells MW1 through <br /> MW14 and in vapor wells VW1 through VW6 Depth to groundwater was then subtracted from each <br /> respective wellhead elevation to determine groundwater elevation Water levels at the site fell <br /> approximately 1 19 feet since last monitored on August 26, 2002 The potenthometnc surface was <br /> above the top of the screened intervals in all monitoring wells except MW1, MW2, MW3, MW13, and <br /> MW14 in vapor wells VWl and VW4 <br /> 1\GZA FSISYSOIT-t-\C,ROUNDZEIROEMQMR1200214gm2002doc <br />