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GROUND ZERO ANALYSIS, INC. <br /> ' 1714 Main Street <br /> Escalon, California 95320 <br /> ' Telephone: (209) 838-9888 <br /> Facsimile: (209) 838-9883 p <br /> 9 M1 <br /> April 26, 2005 F.,�4�; ?405 <br /> JC - <br /> Mr. Nuel Henderson <br /> i ' San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Ave., 3rd Floor <br /> ' Stockton, CA 95202 <br /> Subject: First Quarter 2005 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California (Figure 1) <br /> 1 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 first quarter of 2005. Groundwater related activities <br /> included monitoring groundwater elevations in all site wells and sampling groundwater from <br /> ' monitoring wells MW1 through MWS, MW7, MW8, MW9, MW12, MW1313, MW14, <br /> MW15A, MW1513, MW15C, MW16A, 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-tent-butyl ether (MTBE), ethyl- <br /> ' 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 operated for a short period in order to collect influent <br /> and effluent samples. <br /> 1 <br /> GROUNDWATER ACTIVITIES <br /> ' Groundwater Monitoring and Sampling <br /> ' Depth to groundwater was measured on February 22, 2005 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 /> '41 <br /> �i G:IGROUNPZMOEKIQMR1200511gm2005.doe <br />