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' U-Haul#709-50 <br /> Additional Site Characterization Blaes Environmentai <br /> ' reveal obvious evidence of hydrocarbons Only slight hydrocarbon-like odors were observed at <br /> these depths <br /> ' • The deepest soil sample from borehole DP-2 was collected at approximately 120 feet bgs This <br /> sample consisted of sandy clay and did not reveal observable evidence of hydrocarbon impact <br /> ' • Soil encountered at borehole DP-5 at <br /> 10 feet bgs was colored dark olive to black The very <br /> strong hydrocarbon-like odor emanating froth this sample and the color suggested the presence <br /> of degrading hydrocarbons <br /> r • Soil collected at approximately 30 to 3I feet bgs from <br /> g borehole DP-5 indicated apparent free- <br /> phase hydrocarbons at 30 to 30 5 feet bgs in sand The portion of soil retrieved from 30 5 to 31 <br /> ' feet bgs consisted of clay It was this lower portion of soil that was submitted to the laboratory <br /> for analysis <br /> These observations of soil conditions suggest that borehole locations DP-2 and DP-5 were within the <br /> product release area(s) These observation are also supported with laboratory analytical data <br />' 4 14 it 1 Ana is 1 Rsults <br /> Laboratory analytical results of soil samples collected from boreholes and soil borings are summarized on <br />' Table 4 and discussed below A cross-section display of the analytical results of soil collected along <br /> cross-section A -A' in shown on Figure 7 <br />' • Analysis of soil samples collected from boreholes DP- <br /> 1 and DP-2 indicate that the main zone of <br /> hydrocarbon impact is between approximately 10 and 80 feet bgs Concentrations of TPHg in <br />' soil from these depths ranged from 21,000 milligrams per /Kram kilo rn <br /> g (mg/Kg)g) at 30 feet bgs to <br /> 1,700 mg/Kg at 74 feet bgs Benzene concentrations from the same depths ranged from 4 4 <br /> mg/Kg at 26 feet bgs to 28 mg/Kg at 65 feet bgs <br /> • Analytical results of soil samples collected from borehole DP-3 indicate low detectable <br /> concentrations from 40, 50, 60, and 90 feet bgs Detectable benzene concentrations at these <br /> depths ranged from 0 72 to 0 011 mg/Kg Soil collected at approximately 100 and 110 feet bgs, <br /> which consisted of silty sand and sand, respectively, did not contain detectable concentrations of <br /> f 15 <br /> I <br />