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15 June 2004 <br /> AGE-NC Project No 95-0142 <br /> Page 3 of 12 <br /> 2 13 Soil-Vapor Extraction <br /> The SVE system was monitored weekly for the first month of operation and monthly thereafter <br /> During each monitoring event, the flow rate of extracted soil-vapor(influent)was measured using <br /> an electrical DPT flow meter Vacuum potential was at two and one-half inch influent line using a <br /> magnehelic vacuum gauge <br /> The organic-vapor concentration in the extracted soil-vapor stream was measured before entering <br /> the blower (influent stream) and after exiting the catalytic unit (effluent stream) using an organic <br /> vapor meter(OVM)equipped with a photo-ionization detector PID(Thermo Environmental 580B, <br /> 10 OeV, calibrated to lsobutylene, 100 ppb) <br /> A total of four sets of soil-vapor samples were collected during the three months of operation(fourth <br /> quarter of 2003 and first quarter of 2004) Samples were collected on start-up on 09 December, <br /> 30 December 2003 and 26 January and 23 February 2004, in Tedlar vapor bags using a vacuum <br /> pump attached to the influent and effluent stream <br /> The samples were labeled,placed in a pre-chilled cooler and transported under chain-of-custody to <br /> iMcCampbell Analytical, Inc (MAI) In Pacheco The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified and <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020 <br /> Results of laboratory analysis of soil vapor samples are discussed in Section 3 0 <br /> 2 2 GROUND WATER REMEDIATION SYSTEM <br /> Ground water remediation system installation and operation were performed in accordance with <br /> procedures in the Final Remediation Plan, dated 23 April 2002 and Final Remediation Plan <br /> Addendum, dated 18 July 2003, was approved by the EHD on 29 July 2003 <br /> 2 2 1 Installation of Ground Water Extraction System <br /> The ground water extraction system consisting of the ground water treatment unit and associated <br /> piping was installed between 03 November 2003 and 01 January 2004 <br /> Advanced GeoEnviron mental,Inc <br />