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1 _ <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320 <br /> Telephone (209)838-9888 ENVIRONMENT HEALTH <br /> Facsimile (209)838-9883 PERMIT/SERVICES <br /> i <br /> 1 <br /> June 24, 2003 <br /> ' Mr Nuel Henderson <br /> San Joaquin County <br /> Environmental Health Department <br /> ' 304 East Weber Avenue,Third Floor <br /> Stockton, CA 95202 <br /> tSubject Monitoring Well Installation and 1"Quarter 2003 Sampling Report <br /> 102 S Wilson Way Stockton,California <br /> Dear Mr Henderson <br /> ' This letter report summarizes the results of the additional subsurface investigation conducted <br /> pursuant to the San Joaquin County Environmental Health Department (EHD) directive dated <br /> ' July 20, 2001 This report also presents the results of the first quarter 2003 groundwater sampling <br /> event <br /> ' The investigation involved the installation and sampling of six monitoring wells and was <br /> conducted in accordance with Ground Zero's Addendum to Workplan for Additional Site Activities <br /> dated February 12, 2002 and an August 14, 2002 conference call between Ground Zero, EHD <br /> ' and SWRCB UST Cleanup Fund <br /> Quarterly fieldwork included monitoring groundwater elevations in all site wells, sampling <br /> ' groundwater from monitoring wells MW 1 through MW5, MW7 through MW9, MW 12 through <br /> MW 16B, and sampling groundwater from vapor wells VW l and VW3 <br /> Groundwater analysis consisted of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> ' toluene, ethylbenzene and total xylenes (BTEX), 1,2 dichloroethane (1,2-DCA), ethylene dibromide <br /> (EDB), and gasoline oxygenate additives [methyl-tert-butyl ether (MTBE), ethyl-tert-butyl ether <br /> (ETBE), di-isopropyl ether(RIPE), tert-amyl methyl ether(TAME)and tent-butyl alcohol (TBA)] <br /> 1 <br /> I <br /> ' INTRODUCTION <br /> Purpose <br /> ' The purpose of installing the additional monitoring wells was to further define the lateral and <br /> vertical limits of the plume of dissolved groundwater contamination originating from the release <br /> ' 11GZA FSIVOL_i1DATAIGROUNDZEIROEKICLOSURE\ReportslAdd_HSA_Mud wells doc <br />