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LE <br /> J <br /> GROUND ZERO ANALYSIS, INC. <br /> 1713 Main Street <br /> Escalon, California 95320 <br /> Telephone (209)838-9888 JUN3 203 <br /> Facsimile (209)838-9883 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> September 18, 2002 <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 Third Quarter 2002 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, Califorma (Figure 1) <br /> Dear Mr Henderson <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork <br /> conducted at the subject site during the third quarter 2002 Groundwater related activities <br /> included monitoring groundwater elevations in all site wells, sampling groundwater from <br /> monitoring wells MW 1 through MW5, MW7, MW8, MW9, MW 12 and MW 14 and sampling <br /> groundwater from vapor wells VW1 and VW6 <br /> Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene <br /> dibromide (EDB), and gasoline oxygenate additives [methyl-cert-butyl ether (MTBE), ethyl-tert- <br /> butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME), tert-butyl alcohol <br /> (TBA)] <br /> GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured oq August 26, 2002 in monitoring wells NIWl through <br /> MW14 and in vapor wells VW1 through VW6 Depth to groundwater was then subtracted from <br /> each respective wellhead elevation to determine groundwater elevation Water levels at the site <br /> . fell approximately 1 32 feet since last monitored on May 22, 2002 <br /> I,C,Za_Fh`bYZ,011D tLi1GROUNDZEaOEK\QNIR1200:!13ym2002 doc <br />