ARCHIVED REPORTS_2019 SOIL MGMT PLAN (MAY)

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ILA Soil Investigation Report Pilkington North America, Inc. March 30, 2011 Page 6 Table 2 Soil Sample Labor tory Analytical Results — LUFT 5 Metals Method SW6010B SW6010B SW6010B SW6010B SW6010B SW6010B Sample I.D. Sample Date Cadmium Chromium Lead Nickel Zinc (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) Disposal - comp 3/18/11 < 1.5 17 < 5.0 12 33 Unit Conversions: mg/kg = milligrams per kilogram = parts per million (ppm) Laboratory analytical results of the soil samples collected from the borings indicate that TPH-D constituents were detected at or above the laboratory reported detection limits in all samples. All samples were collected depths between nine and 12 feet bgs, where TPH-D concentrations were expected to be highest based on field screening and visual observations. Iso -concentration contours, shown on Figure 3, Appendix A, are based on laboratory analytical data and indicate that diesel concentrations vary over four orders of magnitude between the area near the former location of Test Pit #I and outlying areas 100 feet down gradient to the northeast. The three sample locations closest to the former location of Test Pit #1 were GP15, GP18, and GP19, with laboratory reported diesel concentrations of 14,000 milligrams per kilogram (mg/kg), 12,000 mg/kg, and 11,000 mg/kg, respectively. Boring locations GP 16, GP 17, and GP20 had laboratory reported diesel concentrations of 4,000 mg/kg, 8,200 mg/kg, and 5,200 mg/kg, respectively. The remaining boring locations GP 12, GP 13, GP 14, GP21, GP22, and GP23 had laboratory reported concentrations of diesel between 1.3 mg/kg and 11 mg/kg. The laboratory -reported analytical data for the composite sample collected for waste characterization and disposal purposes, Disposal -comp, indicated that benzene, toluene, ethyl benzene, MTBE, cadmium, and lead were not detected at or above the laboratory reported detection limits. The laboratory reported analytical data for Disposal -comp indicated that xylenes, total petroleum hydrocarbons quantified as gasoline (TPH-G), TPH-D, chromium, nickel, and zinc were detected at concentrations of 0.014 mg/kg, 25 mg/kg, 2,400 mg/kg, 17 mg/kg, 12 mg/kg, and 33 mg/kg, respectively. The laboratory reported data for TPH-G was qualified with the notation that "strongly aged gasoline or diesel range compounds are significant in the TPH-G chromatogram". 6.3 MASS CALCULATIONS The approximate mass and volume of adsorbed diesel in soil was calculated using a model based on four concentric boxes. Each of the boxes was assigned dimensions intended to approximate the area within the iso -concentration contours shown on Figure 3, Appendix A. Historic site investigation data, as well as the field observations and geologic logs prepared for this investigation were used to select approximate heights for each box, or volume. Boring logs and analytical data from the previous soil and groundwater investigation in 1996 and monitoring well and product recovery well installations in 1999 were also analyzed. Review of historic data indicated that there has been little change in maximum concentrations, lateral or vertical distribution since the initial investigations. Dry density data was used from the 1996 investigation. The volume of each box was calculated and multiplied by the dry density to calculate the mass of soil in pounds, then converted to kilograms. The mass was then multiplied by the average concentration to calculate the mass of diesel in milligrams, and then converted into kilograms, pounds, and gallons. The estimated total mass of diesel in soil was calculated to be approximately 37,500 pounds, or 5,300 gallons. The data, assumptions, interpretation, and model are included with Calculations of Diesel Mass in Soil in Appendix B.