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1 <br /> 1 <br /> ' 1 GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320 _;f <br /> 11 <br /> Telephone (209)838-988$ <br /> Facsimile (209)838-9883 APR 12 2002 <br /> ;n'T HEALTH <br /> F'u lido i/SERVICES <br /> ' Apnl 11, 2002 <br /> i <br /> ' Ms Rebecca Setliff <br /> San Joaquin County <br /> Environmental Health Department <br /> ' 304 E Weber Ave , 3rd Floor <br /> Stockton, CA 95202 <br /> ' Subject First Quarter 2002 Groundwater Sampling Report <br /> 102 South Wilson Way, Stockton, California(Figure 1) <br /> Dear Ms Setliff <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork conducted at <br /> 1 the subject site during the first quarter 2002 Groundwater related activities included surveying all site <br /> wells according to AB 2886, monitoring groundwater elevations in all site wells, sampling groundwater <br /> ' from monitoring wells MWl through MWS, MW7, MW8, MW9, MW12 and MW14, and sampling <br /> groundwater from vapor wells VW2 and VW3 (Vapor well VW2 was inadvertently sampled in lieu of <br /> vapor well VW1 by the technician) <br /> ' Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene dibromide (EDB), and <br /> ' gasoline oxygenate additives [methyl-tert-butyl ether(MTBE), ethyl-cert-butyl ether (ETBE), di-isopropyl <br /> ether(DIPE), Cert-amyl methyl ether(TAME), Cert-butyl alcohol (TBA)] <br /> ' The soil vapor extraction system (VES) was placed into operation on March 7, 2002 Vapor samples <br /> were collected and analyzed for TPHg, BTEX and MTBE <br /> i <br /> SITE ACTNITIES <br /> ' Groundwater Monitoring and Sampling <br /> Depth to groundwater was measured on February 20, 2002 in wells MWl through MW14 and vapor <br /> ' wells VWl through VW6 Depth to groundwater was then subtracted from each respective wellhead <br /> Nelevation to determine groundwater elevation Water levels at the site rose approximately 0 3 8 feet since <br /> last monitored in December 6, 2001 <br /> 1 <br /> ' roeklgmMgm2002 <br />