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1 <br /> I <br /> GROUND ZERO ANALYSIS, INC. <br /> s � <br /> ' 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> ' June 27, 2002 <br /> Ms Margaret Lagono <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Ave, 3rd Floor <br /> Stockton, CA 95202 <br /> N <br /> ' <br /> Subject Second <br /> ] Quarter 2002 Groundwater Sampling and Vapor Extraction Report <br /> 102 South Wilson Way, Stockton, California(Figure 1) - <br /> Dear Ms Lagono W <br /> Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork conducted at <br /> the subject site during the second quarter 2002 Groundwater related activities included monitoring <br /> groundwater elevations in all site wells, sampling groundwater from monitoring wells MW3 through <br /> ' MW6, MW8, MW10, MWl l and MW 14, and sampling groundwater from vapor wells VWl, VW2, and <br /> VW4 through VW6 <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-tent-butyl ether(MTBE), ethyl-tert-butyl ether (ETBE), di-isopropyl <br /> ' ether(DIPE), tert-amyl methyl ether(TAME), tert-butyl alcohol(TBA)] <br /> The soil vapor extraction system (VES) was pulsed during the reporting period Vapor samples were <br /> ' collected and analyzed for TPHg, BTEX and MTBE <br /> ' GROUNDWATER ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> t Depth to groundwater was measured on May 22, 2002 in monitoring wells MW1 through MW14 <br /> and in <br /> vapor wells VWl through VW6 Depth to groundwater was then subtracted from each respective <br /> ' wellhead elevation to determine groundwater elevation Water levels at the site fell approximately 0 12 <br /> feet since last monitored on February 20, 2002 <br /> 4 1 <br /> roeklgmrll gm2002 <br />