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GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon,California 95320 Telephone (209)838-9888 V D Facsimile (209)838-9883 E AIN 13 2006 June 12, 2006 ENVIRONN'IENT HEALTH PERMIT/SERVICES Mr Nuel Henderson San Joaquin County Environmental Health Department 304 E Weber Ave , 3rd Floor Stockton, CA 95202 Subject First Quarter 2006 Groundwater Sampling Report 102 South Wilson Way, Stockton, California (Figure 1) Dear Mr Henderson Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize fieldwork conducted at the subject site during the first quarter of 2006 Groundwater related activities included monitoring groundwater elevations in all site wells and sampling groundwater from select site wells Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes (BTEX), 1,2 dlchloroethane (1,2-DCA), ethylene dibromide (EDB), and gasoline oxygenate additives [methyl-tert-butyl ether (MTBE), ethyl- tert-butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME) and tert- butyl alcohol (TBA)] GROUNDWATER ACTTVIITIZES Groundwater Monitoring and Sampling In conjunction with Stratus Environmental, Inc , who monitored and sampled wells at the adjacent ARCO site, depth to groundwater was measured on March 6, 2006 in monitoring wells MW1 through MW16B and in vapor wells VW1 through VW6 Depth to groundwater was then subtracted from each respective wellhead elevation to determine groundwater elevation Water levels at the site rose an average of 1 44 feet since last measured during the fourth quarter event 1n December 2005 The potentlometric surface was above the top of the screened intervals 1n monitoring wells MW4 through MW 13B, MW 1513, MW 15C, MW 16B and vapor wells VW1 and VW4 Vapor well VW5 was dry G 1GROUNDWROMQMR1 GWI gm2006 doe