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1 <br /> 31 August 2005 <br /> AGE-NC Protect No 95-0109 <br /> Page 2 of 4 <br /> concentration were measured from observation wells MW-1 through MW-10 ORP was measured <br /> with a Hanna Instruments' (HI)-9025 pH meter,DO was measured with a YSI-55 dissolved oxygen <br /> meter ORP and DO data collected during the Ozone infection pilot test is summarized in Table 1 <br /> 2 2 QUARTERLY GROUND WATER SAMPLING AND LABORATORY ANALYSIS <br />' During the pilot test,ground water samples were collected quarterly from observation wells MW-1, <br /> through M W-10 Groundwater samples were collected in August 2004 before ozone injection began <br /> tand then in November 2004, February 2005 and May 2005 <br /> The collected ground water samples were properly labeled and transported in a chilled container <br />' under chain-of-custody to CalTech Environmental Laboratories (CTEL), a California Department <br /> of Health Services (DHS)-certified laboratory Each sample was analyzed for <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, <br /> • BTEX compounds (benzene, toluene, ethylbenzene, and total xylenes) and fuel additives, <br /> including methyl tertiary-butyl ether(MTBE),di-Isopropyl ether(DIPE),ethyl tertiary-butyl <br /> ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene <br />' dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) In accordance with EPA Method <br /> 8260B, <br />' Ground water samples collected during November 2004 were reported in the AGE-prepared, <br /> Quarterly Report-Fourth Quarter 2004,dated 28 March 2005 Water samples collected during the <br /> I February 2005 event were reported in the AGE-prepared, Quarterly Report - First Quarter 2005, <br /> dated 25 May 2005 Water samples collected during the May 2005 event will be reported in the <br /> AGE-prepared, Quarterly Report-Second Quarter 2005 <br /> r <br /> 3.4 FINDINGS <br /> Analytical results of ground water samples and field measurements conducted between 31 August <br /> 2004 and 12 May 2005 were used to evaluate the effectiveness of ozone infection as a remedial <br /> technology at the site <br /> 3 1 REDOX POTENTIAL AND DISSOLVED OXYGEN MEASUREMENTS <br /> Based on eight monthly monitoring events between August 2004 and May 2005,ORP measurements <br /> Advanced GeoEnvnronmental,Inc <br /> I <br />