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1 <br /> 22 October 1996 <br /> AGE-NC Project No. 95-0100 <br /> ' Page 4 of 9 <br /> ' The test was conducted using a VACLEEN 1000 vapor extraction system (VES) manufactured by <br /> Environmental Techniques. The VES consists of a positive-displacement blower, driven by an <br /> internal combustion (IC) engine. The inlet of the VES is connected to an extraction point. The <br /> ' vacuum applied to the extraction well causes hydrocarbons in the soil to volatilize and.ITow through <br /> the vacuum pump to the IC engine. The induced vacuum pressure is monitored at one or more points <br /> using Magnehelic vacuum gauges. <br /> The hydrocarbon vapors are destructed as part of the normal combustionp rocess. Emissions from <br /> the engine are routed through two catalytic converters to maximize the destruction rate of the <br /> ' extracted hydrocarbon vapors. <br /> 2.7.2. PILOT TEST PROCEDURES <br /> The test was initiated at 7:30 am on 18 October 1995 and lasted for approximately 8 hours. An air- <br /> tight IC inlet, pre-connected with a magnehelic vacuum gauge, was attached to VE 1. Beginning at <br /> 7:30 am, an induced vacuum potential was applied to VEL Air-tight well caps, pre-connected with <br /> magnehelic vacuum gauges, were attached to both casings at well VE-2. The purpose of the <br /> monitoring is to estimate the radius of influence exerted by vapor extraction from VE I. <br /> A sample port was tapped into the PVC at the inlet and a portable photo-ionization detector <br /> (Microtip model 1000 calibrated to isobutylene)was used to measure organic vapor concentrations <br /> at half-hour intervals. The port was also used to collect vapor samples-in Tedlar bags. <br /> 2.7.3. COLLECTION AND ANALYSIS OF VAPOR SAMPLES <br />' A total of 4 samples vapor les were collected at <br /> p p two-hour intervals from the inlet of the-extraction well <br /> to measure concentrations of extracted hydrocarbon vapor. The samples were collected in Tedlar <br />' bags using an air pump connected to the vapor inlet. The samples were transported under chain-of- <br /> custody to McCampbell Analytical Inc. (MAI) in Pacheco, California. Each sample was analyzed <br /> within 72 hours for TPH-g and BTE&X in accordance with EPA methods 8015m and 8020, <br /> respectively. <br /> - -��_"2:7:4:a-RESULTS`'OF`VAPOWEXTRACTIONTEST <br /> The in-situ soil vapor extraction (SVE) pilot test was performed at the site to evaluate SVE as a <br /> remediation option for the impacted soil. The-Jin-situ SVE test erformed at the site yielded <br /> . p <br /> acceptable performance results. . <br />