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f <br /> 27 June 1996 <br /> AGE-NC Project No. 95-0118 <br /> ;r Page 6 of 23 <br /> i <br /> test was performed to provide SVE data prior to initiation of a full scale remediation system. The <br /> test was conducted using a VACLEEN 1000 SVE system- manufactured by Environmental <br /> Techniques. The VACLEEN unit consists of a positive-displacement blower, driven by an internal <br /> combustion (IC) engine. Propane was used as a supplemental fuel source to start the engine and <br /> t maintain optimum performance. Hydrocarbon vapors are destructed as part of the internal <br /> combustion process. Emissions from the engine are routed through two catalytic converters to <br /> maximize the destruction rate of the extracted hydrocarbon vapors. <br /> 5.1.2. FIELD MEASUREMENTS AND DATA COLLECTION <br /> The test was initiated at 8:00 am and continued for approximately 8 hours. Well VW-1 was used for <br /> the vapor extraction by applying an induced vacuum potential to the casing of VW-1. <br /> The induced vacuum pressure.was monitored at surrounding observation points (VW-2, MW-2 and <br /> MW-3), Air tight well caps pre-connected with Magnehelic vacuum gauges were attached to each <br /> of the observation wells. <br /> A sample port was tapped into the PVC near the wellhead and a portable photo-ionization detector <br /> (PID: Microtip model 1000 calibrated to isobutylene) was used to measure.organic vapor (OV) <br /> concentrations. OV concentrations, as well as induced vacuum at the observation paints, flow rate <br /> -a and RPMs of the SVE unit,were measured at 0.5-hour intervals and logged on field sheets.Pilot test <br /> data are summarized in Table 4. Field data sheets are presented as Appendix F. <br /> 5.1.3. . COLLECTION AND ANALYSIS OF VAPOR SAMPLES <br /> } A total of four(4)vapor samples-fere collected'during the pilot test, Vapor samples.were collected <br /> at two-hour intervals from the inlet of the extraction well to measure hydrocarbon concentrations in <br /> the extracted vapor. The samples were collected in Tedlar bags using an air pump. Samples were <br /> transported under chain-of-custody to MAI. Each sample was analyzed within 72 hours for TPH-g <br /> and BTE&X in accordance with EPA methods 8015m and 8020, respectively. <br /> i 5.2. RESULTS OF SOIL VAPOR EXTRACTION PILOT TEST . <br /> 5.2.1. FIELD MEASUREMENTS <br /> The SVE unit was maintained at approximately 2,000 RPMs. Initial flow rates were measured at 40 <br /> scfm(standard cubic feet per minute)and reached 53 scfm after 7.5 hours. OV readings ranged from <br /> --1 <br />