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GROUND ZERO ANALYSIS, INC. <br /> i <br /> Street <br /> Esc <br /> Escalon,on, California 95320 ILLIUll1l �u` <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> OCT 2 1 2003 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> October 17, 2003 <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 2403 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 <br /> conducted at the subject site during the third quarter of 2003 Groundwater related activities <br /> included monitoring groundwater elevations in all site wells, sampling groundwater from <br /> monitoring wells MW1 through MW5, MW7, MW8, MW9, MW12 and MW13B through <br /> MW1613, and sampling groundwater from vapor wells VW1 and VW3 <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-tert-butyl ether (MTBE), ethyl- <br /> tert-butyl ether (ETBE), di-isopropyl ether (DIPE), Cert-amyl methyl ether (TAME) and tert- <br /> butyl alcohol (TBA)] <br /> GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on August 26, 2003 in monitoring wells MW 1 through <br /> MW16B and in vapor wells VW1 through VW6 Depth to groundwater was then subtracted <br /> from each respective wellhead elevation to determine groundwater elevation Water levels at <br /> the site fell approximately 1 31 feet since the second quarterly event (May 28, 2003) <br /> 1\GZA FS\VOL_]\DATA\GROUNDZEROEK\QMR\2003\3gm2003 doc <br />