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AGE-NC Project No. 99-0559 Page 5 of 14 concentrations of hydrocarbons to warrant operation in the high temperature thermal mode. The SVE system began operation on 13 December 2006 in accordance with San Joaquin Unified Air Pollution Control District (APCD) permit. Between 13 December and 26 December 2006, the SVE unit operated for approximately 316 hours. The SVE unit operated at variable operational rates during the observation period. Extraction flow rates were calculated to range from 50 scfm for startup testing, 150 scfm for start operation to approximately 180 cfm after one week of full operation. In July 2008, the SVE unit began to operate in catalytic mode. ON-SITE CPT LITHOLOGIC INVESTIGATION: APRIL 2001 Three soil borings (CPT-1, CPT-2 and CPT-3) were advanced on-site utilizing CPT technology to model the geological and hydrogeological framework and to assess the vertical extent of dissolved petroleum-hydrocarbons beneath the site. Lithologic data was collected from an initial CPT soil boring in each locality, a twin boring was then advanced immediately adjacent to the initial CPT soil boring to collect soil and grab groundwater samples from selected depths. Soil borings CPT-1, CPT-2 and CPT-3 were advanced vertically to maximum depths of approximately 155 feet below surface grade (bsg), 162 feet bsg and 158 feet bsg, respectively. CPT1 was advanced at the western edge of the site, in the down-gradient direction from the UST area; CPT2 was advanced adjacent to the UST release, within the core area of the hydrocarbon-impacted vadose soil; and CPT3 was advanced along the southern edge of the site, at the furthest southern point on the site from the UST release, in a cross-gradient location. A site plan depicting boring locations is presented in Figure 2. Groundwater sample was collected from the CPT borings at the following intervals: CPT-1 was sampled at 60 feet (HU2), 100 feet (HU4), 130 feet bsg (HU5U) and 150 feet bsg (HU5L); CPT-2 was sampled at 100 feet (HU4), 130 feet (HU5U) and 150 feet bsg (HU5L) and CPT-3 was sampled at 60 feet (HU2), 100 feet (HU4), 130 feet bsg (HU5U) and 150 feet bsg (HU5L) The CPT drill rig, equipped with 2-inch diameter hollow-stem rods fitted with a 1.25-inch diameter piston soil sampling assembly loaded with a pre-cleaned brass sleeve, was used to collect soil samples from 80 feet bsg, 110 feet bsg and 135 feet bsg in the twin of boring CPT-2. The sample collected from 80 feet (CPT2-80 — HU3) contained TPH-g at 1,500 milligram per kilogram (mg/kg); BTEX compounds were detected in at concentrations as high as 210 Advanced GeoEnvironmental, Inc.