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I28 November 2005 <br /> AGE-NC Project No 00-0696 <br /> Page 2 of 5 <br /> sample was transferred into three laboratory-supplied, 40-milliliter (ml) volatile organic analysis <br />' (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative, and one <br /> 1-liter amber bottle without preservative After collection,the samples were properly labeled,placed <br /> in a chilled container, and transported under chain of custody to Cal Tech Environmental <br /> Laboratories(CTEL),a State of California Department of Health Services(DHS)-certified analytical <br /> laboratory, for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) in accordance with EPA Method 8015M, and <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additives methyl tertiary- <br /> butyl ether(MTBE),tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary- <br /> butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dibromoethane (EDB), and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 23 SENSITIVE RECEPTOR SURVEY <br /> . Between August and October 2005,AGE completed a sensitive receptor survey as part of initial site <br /> characterization requirements under the California Code of Regulations - Title 23, Division 3, <br /> Chapter 16, Section 2654 The objective of the survey was to identify and locate sensitive receptors, <br /> including wells,potentially affected by the UST release,and to identify and locate potential vertical <br /> conduits The scope of work included the following tasks <br /> • Review of State of California Department of Water Resources records, and <br /> • Performance of a visual area reconnaissance for municipal, domestic, irrigation, or ground <br />' water monitoring wells within a 2,000-foot radius of the site <br />' 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data, hydrocarbon impact to <br /> ground water was quantified by laboratory analysis of the ground water samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> • depths to ground water from the surveyed relative casing elevations (Table 1) Depths to ground <br />' Advanced GeoEnvironmental,Inc <br /> I <br />