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23 Remedial Well and System Installation <br /> The lateral ozone infection lines, soli vapor extraction lines, and remediation compound were <br /> installed following installation of the ozone sparge and SVE wells The location of the treatment <br /> compound is shown on Figure 3 The SVE lines were stubbed up into a manifold in the treatment <br /> compound The initial SVE system consisted of a 500 cubic feet per minute (cfm) blower with a <br /> catalytic oxidizer fired by natural gas connected to the SVE well field manifold Soil vapor <br /> extraction was initiated at the Site on September 26, 2002, under San Joaquin Valley Air Pollution <br /> Control District (SJVAPCD) Authority to Construct number N-4613-1-0 <br /> The 20 ozone sparge pipes were stubbed up into a manifold and connected to the 6 cfm ozone sparge <br />' skid Ozone sparging was initiated at the Site on November 20, 2002 <br /> The catalytic oxidizer unit was replaced in June 2003 with a 300-cfm blower using granular activated <br /> carbon (GAC) to abate contaminants The 300 cfm blower with GAC was replaced by a 250 cfm <br /> blower with a catalytic oxidizer unit in February 2004 <br /> Additional details of the remediation well installation and system startup are described in Secor's <br /> Remediation Well and Soil Vapor Extraction System Installation Report, dated November 27, 2002 <br /> 2.4 Domestic Wells <br /> Four domestic water supply wells (DW-1R, DW-2R, DW-3 and DW-4), one inactive domestic water <br /> supply well (DW-1) and one destroyed domestic water supply (DW-2) well are located within 340 <br /> feet of the former tank pit(Figure 2) <br /> Well # Location from Tank Pit Comments <br /> DW-1 90 feet west Upgradient of tank pit (onsite well) <br />' <br /> DW-IR 120 feet west Upgradient of tank pit(onsite well) <br /> DW-2 120 feet south Downgradient well (well destroyed) <br />' DW-3 245 feet south Downgradient of tank pit <br /> DW-4 340 feet south Downgradient of tank pit <br /> DW-2R 200 feet south Downgradient of tank pit(well installed <br /> 1 December 2000 to replace DW-2) <br /> Water samples collected from domestic wells have been analyzed for the presence of TPHg, BTEX, <br />' five oxygenates, 1,2-DCA, and EDB Since water samples collected from DW-2 contained <br /> reportable concentrations of MTBE, the well was taken out of service and replaced with DW-2R <br /> Domestic well DW-1 is considered a public water supply because it services a retail store (Ranch <br /> Market) The nitrate concentrations detected in water samples collected from DW-1 exceeded the <br /> drinking water standards A replacement well (DW-1R) for DW-1 was constructed in February 2004 <br /> Project No 58643-06-01 -3- February 14 2005 <br />