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R y • • i <br /> Ms Lori Duncan <br /> Page 3 of 5 <br /> PROCEDURES AND RESULTS <br /> Purpose <br /> The purpose of the work described herein was to remove contaminated soil from the subsurface; <br /> document the completeness of the removal effort with soil samples; further investigate the vertical <br /> limit of contamination; and properly dispose of contaminated soil removed from the excavation. <br /> Resources <br /> Excavation was conducted by Jim Thorpe Oil, Inc. Sean Garvey, a Ground Zero geologist, <br /> supervised excavation activities and sample collection. Lori Duncan with PHS/EHD observed <br /> field activities and conducted the site inspection. Argon Laboratories, Inc. (Argon, ELAP 2359) <br /> and McCampbell Analytical, Inc (McCampbell, ELAP 1644), both California state-certified <br /> hazardous waste testing laboratories, completed the laboratory analysis. Excavated soil was <br /> disposed of at Forward Landfill. <br /> Source Removal Excavation <br /> On November 8, 2000, approximately 165 cubic yards of soil was excavated out of an area measuring <br /> approximately 17 feet x 18 feet x 17 feet in depth. <br /> Excavation proceeded laterally and vertically until lack of odor and significant flame ionization <br /> detector (FID) readings indicated that impacted soil had been removed in all quadrants of the <br /> prescribed area. Impacted soil in the central and northern portion of the pit did not appear to <br /> extend beyond 10 feet bgs. Excavated material was stockpiled on and covered by visqueen plastic <br /> pending disposal. <br /> The excavation boundaries extended to the perimeter borings advanced to the north, south and west. <br /> Removal of the soil to the east was limited due to the bounding of the shop building. No groundwater <br /> was encountered during the excavation activities. Figure 3 depicts the excavated area. Field notes are <br /> included in Attachment A. <br /> Soil Sampling <br /> A total of five confirmation soil samples were collected from the excavation pit. Samples were <br /> collected at approximately 10 and 17 feet bgs along the northern sidewall. Two samples were <br /> collected along the eastern sidewall at depths of approximately 10 and 18 feet bgs, and one sample was <br /> retrieved from a depth of approximately 20 feet bgs from the floor of the excavation. No confirmation <br /> samples were collected from the southern and eastern walls of the excavation as the analytical results <br /> for the samples collected during the previous soil boring investigation were at non-detectable levels <br /> for all target analytes (Table 2). The confirmation samples were submitted under chain of custody <br /> to Argon for analysis. Sampling locations are shown on Figure 3. Field notes are included in <br /> Attachment A. <br /> I <br /> Nsauto/reports/excaysu m.doc <br />