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GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon,California 95320 j Telephone: (209)838-9888 ' Facsimile: (209)838-9883 June 12, 2000 1 i ' Mr Ron Rowe San Joaquin County Public Health Services Environmental Health Division ' 304 E Weber Ave , 3rd Fl Stockton, CA 95202 Subject Second Quarter 2000 Report, Knowles/Roek Property 102 South Wilson Way, Stockton, California (Figure 1) _ Dear Mr Rowe Ground Zero Analysis, Inc (Ground Zero) has prepared this report to summarize activities during the second quarter 2000 at the subject site Groundwater related activities included monitoring groundwater elevations and sampling groundwater from monitoring wells As requested by San Joaquin County Public Health Services Environmental Health Division (PHS/EHD), groundwater samples were also collected from all vapor wells except VW2 Analysis consisted of total i ' petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (DCA), ethylene dibromide (EDB), and gasoline oxygenate additives [methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), di-isopropyl ether (RIPE), ' tertiary amyl methyl ether(TAME), tertiary butyl alcohol (TBA), methanol and ethanol] The soil vapor extraction system (VES) was not in operation during the second quarter 2000 The system was shut down on January 3 pending direction from PHS/EHD with respect to the confirmation soil borings, and remedial effectiveness evaluation proposed in Ground Zero's workplan dated September 17, 1999 1 GROUNDWATER ACTIVITIES Groundwater Monitoring and Sampling Groundwater monitoring was conducted on May 9, 2000 Depth to groundwater was measured in wells MW 1 through MW 11 and MW 13 and subtracted from the wellhead elevations to determine groundwater elevation (monitoring well MW12 was not accessible) The depth to ' roeklgmr12QM2000