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1 <br /> 16 and 0 98 ppm benzene This soil was returned to the excavation as backfill to be remediated <br /> concurrently with the rest of the site <br /> ' In September 1992, a preliminary site assessment was conducted by Canome Environmental to <br /> further evaluate the subsurface conditions at the site This investigation involved drilling a total <br /> of nine soil borings Three of the borings were completed as 4-inch diameter vapor extraction <br /> wells (W-1, W-2, and W-3) and three of the borings were completed as 2-inch diameter vapor- <br /> inlet wells (W-4, W-5, and W-6) Approximate locations of these borings and wells are shown <br /> on Figure 2 Results appeared to define the extent of soil contamination and indicated that <br /> ' petroleum hydrocarbons exist primarily in the area of the former tanks to a depth of 30 to 35 feet <br /> below ground surface (bsg) The data for this investigation is contained in the document, Site <br /> ' Assessment Work Plan dated July 24, 1992, prepared by Canonie <br /> ' In December 1993, an additional Site assessment was conducted by SECOR to verify the extent <br /> of petroleum hydrocarbons in soil at the site This investigation involved the drilling of five soil <br /> borings, and the construction of two vapor extraction/inlet wells (W-7, W-8) During this <br /> ' investigation unanticipated impacts were found to exist outside of the former tank bed The data <br /> for this assessment is found in the document, Environmental Assessment„Report, dated June 14, <br /> ' 1994 <br /> ' 3.0 SCOPE OF WORK <br /> ' 3 1 Pre-field Activities <br /> Prior to commencing work, a Site Specific Health and Safety Plan was prepared in accordance <br /> i ' with Occupational Safety and Health Administration (OSHA) Standard 29 CFR 1910 120 All <br /> personnel contracted for the field investigation were required to review and understand this plan <br /> I ' In addition, a utility clearance was conducted to safeguard that the drilling activities would not <br /> impact any subsurface utilities rhe clearance involved retaining a private locating service for <br /> I"b No N000N-001 01 '� 51-(M <br /> I OCKF RPT lS.A r <br /> I <br />