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. 02 May 1996 <br /> AGE Project No. 95-0108 <br /> Page 4 of 7 <br /> 3.3. CONFIRMATION OF HYDROCARBON-DAPACTED SOIL, JUNE 1993 <br /> On 23 June 1993, an exploratory excavation of the former UST area was conducted by Park to assess <br /> hydrocarbon impacted-soil. A excavator was used to exposed hydrocarbon-impacted soil, in the <br /> former UST excavation. Two soil samples were collected from the north wall of the excavation. TPH <br /> was detected in the soil samples at concentrations as high as 4,500 ppm. Analytical results of the soil <br /> samples are summarized on Table 3. <br /> 3.4. EXCAVATION OF HYDROCARBON-IMPACTED SOIL, SEPTEMBER <br /> AND NOVEMBER 1993 <br /> On 10 September 1993, approximately 1,800 cubic yards of hydrocarbon-impacted soil was <br /> excavated from the former UST area under the direction of Park Environmental. Seven soil samples <br /> were collected from the sidewalls and floor the excavation; sampling was witnessed by representatives <br /> of the PHS-EHD. The soil samples were transported under chain-of-custody to Anlab of Sacramento, <br /> California. The samples were analyzed for TPH-g, TPH-d and BTE&X in accordance with EPA <br /> methods 8015m, 8015m and 8020, respectively. <br /> Petroleum hydrocarbons were detected in soil samples collected from the excavation at <br /> concentrations as high as 1,400 ppm(TPH-d, SW-1-P; 11 feet bsg). Petroleum hydrocarbons were <br /> not detected in sample WW-1-P, collected from the west wall at a depth 11 feet bsg. <br /> On 21 October 1993, Park Environmental excavated an additional 350 cubic yards of soil from the <br /> former UST area. Hydrocarbon-impacted soil was excavated from the southern and the northwestern <br /> portion of the excavation. Petroleum hydrocarbons were not detected in soil samples collected during <br /> the October 1993 excavation. Approximate locations of the soil samples collected and results of the <br /> September and October 1993 excavation soil samples were reported in a letter to the PHS-EHD <br /> dated 15 November 1993, prepared by Park Environmental, and are summarized in Table 3. <br /> On 23 November 1993, two soil samples were collected by Park. One soil sample was collected from <br /> the floor of the excavation(SB3; 16.5 feet) and one sample was collected from the east wall of the <br /> excavation(ESW; 11 feet). However, analytical results for the soil samples were not on file with the <br /> PHS-EHD. <br /> 3.5. EXCAVATION OF HYDROCARBON-PAPACTED SOIL, FEBRUARY 1994 <br /> On 11 February 1994, an additional 850 cubic yards of hydrocarbon-impacted soil was excavated <br /> from the former UST area, extending the excavation to a depth of 24 feet bsg. Excavation was <br /> supervised by Park Environmental. Three soil samples were collected from the excavation. Verbal <br />