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GROUND ZERO ANALYSIS, INC. t�> 1714 Main Street Escalon, California 95320 Telephone: (209)838-9888 D Facsimile: (209)838-9883 ID E C E V�D L z� oa MAR 2 6 2004 March 24, 2004 ENVIRUNMENT HEALTH PERMIT/SERVICES Mr. Nuel Henderson San Joaquin County Environmental Health Department 304 E. Weber Ave., 3rd Floor Stockton, CA 95202 Subject: First Quarter 2004 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 2004. Groundwater related activities included monitoring groundwater elevations in all site wells; sampling groundwater from monitoring wells MW 1 through MW5, MW7, MWS, MW9, MW 12, MW 13B MW 14, MW15A through MW 15C, MW 16A and MW 1613; and vapor wells VW 1 and VW3. Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene dibromide (EDB), and gasoline oxygenate additives [methyl-tent-butyl ether (MTBE), ethyl- tert-butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl methyl ether (TAME) and tert- butyl alcohol (TBA)]. The soil vapor extraction system was operated for a limited period during the quarter. GROUNDWATER ACTIVITIES Groundwater Monitoring and Sampling Depth to groundwater was measured on February 24, 2004 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 approximately 0.59 feet since the fourth quarter event in November, 2003. N\GZA_FSIVOL_11DATA%GROUNDZE ROEKIQMR1200411gm2004.doc 9