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03 September 2004 <br /> AGE-NC Project No 98-0448 <br />' Page 6of13 <br />' SVE/IAS remediation operations were temporarily suspended on 10 March 2004 to make the above <br /> mentioned repairs, the SVE/IAS remediation system was re-started on 20 April 2004 <br />' Due to a `spike' encountered in the SVE influent air flow vapor sample collected on 03 June 2004, <br /> AGE re-installd two sequential 100-gallon carbon canisters routed to the outlet of the vacuum blower <br /> on 04 June 2004 <br /> 3 1 SOIL VAPOR EXTRACTION SYSTEM PROCEDURES <br />' The SVE system utilized a Fuji, 3-horsepower regenerative vacuum blower to volatilize and extract <br /> adsorbed hydrocarbon vapor from the subsurface A manifold network of two-inch diameter, ' <br />' schedule 80 PVC piping was installed underground from wells VW-1 through VW-6 to the inlet of <br /> the'regenerative vacuum blower, the outlet from the vacuum blower was routed through a vapor <br />' moisture knockout drum <br /> A Magnehelic vacuum gauge was attached to the inlet of the blower, air flow was monitored at the <br /> inlet using a Dwyer DS-200 flow sensor A flow rate was determined from the measured differential <br /> pressure and the piping diameter using a nomograph (Appendix F) I ' <br />' In order to monitor the efficiency of hydrocarbon removal, 1)the SVE air flow of the influent stream <br /> was monitored routinely utilizing an organic vapor analyzer(OVA),and 2)an influent air flow vapor <br /> stream sample was collected from sampling ports installed upstream(influent)of the vacuum blower <br />' and analyzed Field measurements were recorded at regular intervals and are summarized in Table 3 <br />' 3 I 1 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of five extracted influent air flow vapor samples were collected on 23 February, 27 April, <br />' 26 May,03 June and 22 June 2003 from the influent stream of the regenerative vacuum blower unit <br /> to measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags using <br /> a hand air-vacuum pump <br />' Following sample collection, the,samples were properly labeled, placed in a covered container and <br /> transported under chain of custody to Cal Tech Environmental Laboratories(CTEL),a DHS-certified <br />' laboratory for analysis Each sample was analyzed within 72 hours of collection for TPH-g and <br /> BTEX in accordance with EPA Methods 8015C Modified and 8021B, respectively <br /> 1 <br /> Advanced GeaEnvironmental,Inc <br /> I� <br /> r <br />