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AGE-NC Project No. 99-0559 <br />Page 5 of 13 <br />The SVE system began operation on 13 December 2006 in accordance with San Joaquin <br />Unified Air Pollution Control District (APCD) permit. Between 13 December and 26 <br />December 2006, the SVE unit operated for approximately 316 hours. The SVE unit <br />operated at variable operational rates during the observation period. Extraction flow rates <br />were calculated to range from 50 scfm for startup testing, 150 scfm for start operation to <br />approximately 180 cfm after one week of full operation. A total of 2,293 kilograms or 5,054 <br />lbs or represented as 808.6 gallons of petroleum hydrocarbons were removed from the site <br />in the first seven days of operation (between 13 to 19 December 2006). In July 2008, the <br />SVE unit began to operate in catalytic mode. A total of 28,986 lbs of petroleum <br />hydrocarbons was removed from the site since the initiation of SVE operation (December <br />2006). <br />Based December 2009 date, the SVE extraction system has removed at total of 32,814 <br />lbs or a volume of 5,250 gallons of petroleum. <br />ON-SITE CPT LITHOLOGIC INVESTIGATION: APRIL 2001 <br />Three soil borings (CPT-1, CPT-2 and CPT-3) were advanced on-site utilizing CPT <br />technology to model the geological and hydrogeological framework and to assess the <br />vertical extent of dissolved petroleum-hydrocarbons beneath the site. Lithologic data was <br />collected from an initial CPT soil boring in each locality, a twin boring was then advanced <br />immediately adjacent to the initial CPT soil boring to collect soil and grab groundwater <br />samples from selected depths. Soil borings CPT-1, CPT-2 and CPT-3 were advanced <br />vertically to maximum depths of approximately 155 feet below surface grade (bsg), 162 <br />feet bsg and 158 feet bsg, respectively. CPT1 was advanced at the western edge of the <br />site, in the down-gradient direction from the UST area; CPT2 was advanced adjacent to <br />the UST release, within the core area of the hydrocarbon-impacted vadose soil; and CPT3 <br />was advanced along the southern edge of the site, at the furthest southern point on the site <br />from the UST release, in a cross-gradient location. A site plan depicting boring locations <br />is presented in Figure 2. <br />Groundwater sample was collected from the CPT borings at the following intervals: <br />CPT-1 was sampled at 60 feet (HU2), 100 feet (HU4), 130 feet bsg (HU5U) and 150 <br />feet bsg (HU5L); <br />CPT-2 was sampled at 100 feet (HU4), 130 feet (HU5U) and 150 feet bsg (HU5L) <br />and <br />CPT-3 was sampled at 60 feet (HU2), 100 feet (HU4), 130 feet bsg (HU5U) and 150 <br />feet bsg (HU5L) <br />Advanced GeoEnvironmental, Inc.