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Site Background Information: Cherokee Truck Stop AGE-NC Project No. 97-0312 Page 7 of 9 HIGH VACUUM SOIL VAPOR EXTRACTION (SVE) PILOT TEST PROCEDURES On 18 February 2010, an 8-hour high vacuum SVE pilot test was conducted at the site using vapor well VW-1 (screened 10 feet to 30 feet) as the extraction well. The SVE system consisted of utilizing a portable, 25-horsepower, oil-sealed (Dyna Seal) liquid ring pump (Travaini Pump) to extract soil-vapor from on-site soil vapor extraction well VW-1 (4-inch diameter well screened 10 to 30 feet bsg). Soil-vapor was sampled within a Tedlar. sampling bag and carbon-charcoal tubes, and vapor was measured with an OVM: equipped with a PID. An effluent vapor sample was also collected and OVM measurements were collected to monitoring the destruction of the hydrocarbons. During the test, soil-vapor flow was monitored at the well head of VW-1 utilizing a Blue White flow rotometer/totalizer.The flow rate was recorded in SCFM Organic vapor concentrations were monitored for the,presence of organic vapor using an organic vapor meter equipped with a photo-ionization detector(PID:Thermo Environmental 580, 10.0 eV, calibrated to isobutylene). HVSVE Pilot Test Sampling and Analysis A total of three soil-vapor samples were collected during the pilot test. Soil-vapor samples were collected at three intervals(10:00, 13:00 and 16:00)from a sample port near the inlet of the vacuum blower to measure hydrocarbon concentrations in the extracted soil-vapor. The samples were collected in Tedlar bags using an electric air pump. Samples were transported in a chilled container under chain-of-custody to McCampbell Analytical Inc. (MAI) a California Department of Public Health (CDPH)-certified laboratory. Each sample was analyzed within 72 hours for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether (MTBE), tert- amyl methyl ether(TAME), di-isopropyl ether(DIPE), ethyl tert-butyl ether(ETBE), tent-butanol (TBA), ethylene di-bromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance with EPA Methods 8015M and 82608. • TPH-diesel in accordance with NIOSH 1550 for total extractable petroleum hydrocarbons. Advanced GeoEnvironmental,Inc.