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27 1�ebruary 2007 <br /> AGE-NC Project No. 07-1514 <br /> Page 3 of 6 <br /> • The hydrocarbons reported as TPH-d in the soil sample collected from boring B-2 at 36 It <br /> bsg did not exhibit the typical diesel chromatographic patterns and could not make a <br /> definitive determination without further tests. <br /> • The hydrocarbons reported as TPH-d in the ground water samples collected from borings <br /> B-l. B-2 and B-4 did not exhibit the typical diesel chromatographic patterns and could not <br /> make a definitive determination without further tests. <br /> • The chromatograms for ground water samples B-1, B-2 and B-4 were analyzed by EPA <br /> method 8260 and indicated the discrete peaks previously identified as TPH-d were tentatively <br /> identified as dodecane. <br /> • The chromatograms for ground water samples B-2 and B-3 were analyzed by EPA method <br /> 8260 and indicated the discrete peaks previously identified as TPH-g were tentatively <br /> identified as chloroform. <br /> In their letter dated 27 November 2006, EHD reviewed the additional information provided by Kiff <br /> in their supplementary report dated 17 July 2006 and stated that the tentative;"dentific ion of, <br /> dodecane and chloroform, combined with the low concentrations of`TPH-d in soil and ethanol its <br /> ground water may warrant the site for closure. <br /> 3.0. SCOPE OF WORK <br /> AGE proposes to collect soil-vapor samples to assess the potential for soil-vapor intrusion into the <br /> existing buildings on the site. <br /> The site assessment will include the following tasks: <br /> • Pre-field work activities; <br /> • Soil-vapor sample collection and analysis; and <br /> • Report preparation to include fate and transport modeling to assess the potential for soil- <br /> vapor intrusion into existing on-site buildings. <br /> 3.1. PRI:-FIELD WORK 'TASKS <br /> As required by the CVRWQC13 a site specific Health and Safety Plan will be prepared in accordance <br /> with Occulmlional Safely and Heallh Guidance Manual_for- Hazar• loos fVasle Sile .4clivilies <br /> (National Institute for Occupational Safety and Health Administration) and federal (29 CFR <br /> Advanced GeoEnvironmental,Inc. <br />