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' 04 October 2000 <br /> . AGE-NC Project No 97-0290 <br />' Page 4 of 9 <br /> I27 SOIL-VAPOR EXTRACTION <br /> The SVE system was monitored weekly for the first month of operation and bi-weekly thereafter <br /> During each monitoring event, the flow rate of extracted soil-vapor was measured using a Dwyer <br /> pressure flow meter Vacuum (potential) was measured at wells VW-1 and VW-2 using a <br /> I magnehehc vacuum gauge The organic-vapor concentration in the extracted soil-vapor stream was <br /> measured before entering the blower (influent stream) and after exiting the oven (effluent stream) <br /> using an organic vapor meter (OVM) equipped with a photo-ionization detector PID (Thermo <br /> IEnvironmental 580A, 10 OeV, calibrated to isobutylene 100 ppb) <br /> Three sets of soil-vapor samples were collected during the first quarter of operation Samples were <br /> Icollected on 17 May, 19 June and 06 July 2000 in Tedlar vapor bags using a vacuum pump attached <br /> to the influent and effluent stream The samples were labeled, placed in a pre-chilled cooler and <br /> I transported under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco The samples <br /> were analyzed by <br /> I • 0 EPA methods 8015M for TPH-g and <br /> • EPA method 8020 for BTEX <br /> The results of the laboratory analysis are summarized in Table 2 <br /> 28 SPARGE SYSTEM INSTALLATION/MONITORING <br /> A compressor-based EnviroSparge IAS system was installed at the site on 10 March 2000 <br /> The compressor was connected to the sparge wells using a one-inch diameter PVC pipe network via <br /> surface piping The IAS system delivers 7 to 10 standard cubic feet per minute (scfm) at a pressure <br /> of 12 to 15 pounds per square inch, adequate to volatilize the petroleum hydrocarbons in the ground <br /> water and transfer hydrocarbons from the dissolved ground water state into the soil vapor phase The <br /> EnvioSparge IAS system began full-scale operation in April 2000 <br /> The IAS system was monitored three times during the quarter A YSI-55 dissolved oxygen meter was <br /> used to measure purged ground water During each monitoring event, the depth to ground water and <br /> per cent dissolved oxygen were measured for each monitoring well (Tables 3) General system <br /> maintenance and adjustments were performed at this time The sparging flow rate was adjusted to <br /> approximately 7 to 8 scfm and to a pressure of 12 psi <br /> • <br /> Advanced CeoEnvironmental,Inc <br />