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17 October 2000 <br /> ,r AGE-NC Project No. 98-0450 <br /> l'a�(ye 4 of'7 <br /> During each monitoring event, the flow rate of'extracted soil-vapor (intluent) was measured us1110 <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 580A. <br /> — 10.0eV. calibrated to isobutylene 100 ppb). <br /> Three sets of'soil-vapor samples were collected during the first quarter of operation (third quarter <br /> 2000). Samples were collected on 20 .Iuly, 29 August and 26 September 2000, in Tedlar vapor bags <br /> using a vacuum pump attached to the influent and effluent stream. The samples wcre labeled, placed <br /> in a pre-chilled cooler and transported under chain-of-custody to McCampbell Analytical. Inc. (MAI) <br /> in Pacheco. The samples were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPfl-g) and diesel (TFH-d) in <br /> accordance with EPA Method 801 a 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 /> The results of the laboratory analysis are su nmarized in Table 2. <br /> 2.7. SPARGE SYSTEM INSTALLATION <br /> A compressor-based InviroSparge IAS system was installed at the site on 18 June 2000. <br /> The compressor was connected to the sparge wells using a one-inch diameter PVC pipe network via <br /> under ground piping. The IAS system delivers 10 standard cubic feet per minute (sefin) at a pressure <br /> Of 10 pounds per square inch. adequate to displace the static water within each sparge well. <br /> The I m ioSparge IAS system began full-scale operation on 10 July 2000. The [AS system was <br /> monitored and serviced over the quarter. The dissolved oxygen in the ground water wells was not <br /> measured regularly during the quarter. I lowever, dissolved oxygen has shown a low to moderate <br /> increase in four ground water wells. since the initiation of the remediation system. <br /> The sparging flwv rate was adjusted to approximately 8 to 10 scfm and to a pressure of 10 psi. <br /> Adeaneed CCOV11%irannwFIG11,inc. <br />