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GROUND ZERO ANALYSIS, INC. <br /> r 1714 Main Street { <br /> Escalon,California 95320 <br /> Telephone: (209)838-9888 c, <br /> Facsimile: (209)838-9883f`-' <br /> SEP 2 0 2004 <br /> September 17, 2004 <br /> pER ''' rr i <br /> Mf1/SERVrCES <br /> 1 <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 2004 Groundwater Sampling Report <br /> ' 102 South Wilson Way, Stockton, California (Figure 1) <br /> 1 <br /> ' Dear Mr. Henderson: <br /> Ground Zero Analysis, Inc. (Ground Zero) has prepared this report to summarize fieldwork <br /> during the third quarter of 2004. Groundwater related activities <br /> • d at the subject site <br /> , . <br /> conducted J g <br /> included monitoring groundwater elevations in all site wells; sampling groundwater from <br /> monitoring wells MW1 through MW5, MW7 through MW9, MW12, and MW13B though <br /> MW16B; and 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 /> ' tent-butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME) and tert- <br /> butyl alcohol (TBA)]. <br /> ' The soil vapor extraction system was not in operation during the quarter. <br /> ' GROUNDWATER ACTIVITIES <br /> ' Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on August 24, 2004 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 an average of 1.4 feet since the second quarter event in May 2004. The <br /> \\GZA FSIVOL—ITATA1GROUNDZEIROEKIQMR1200413gon2004.doe <br />