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i <br /> GROUND ZERO ANALYSIS, INC. <br />� t <br /> • 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone: (209)838-9888 a <br /> Facsimile: (209) 838-9883 X, <br /> C <br /> June 4, 2004 `� 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: Second Quarter 2004 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 second quarter of 2004. Groundwater related activities <br /> included monitoring groundwater elevations in all site wells; sampling groundwater from <br /> monitoring wells MW3 through MW6, MWS, MW10, MW11 and MW13B though MW16B; <br /> and vapor wells VW2, VW4 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-tert-butyl ether (MTBE), ethyl- <br /> I ' tent-butyl ether (ETBE), di-isopropyl ether (DIPE), tent-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 May 19, 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 rose an average of 0.64 feet since the first quarter event in February 2004. <br /> 1 <br /> ' 11GZA_FSW0L_IWATAIGROUNDZE\ROEK\QMR1200412gm2044.dac <br />