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U-Haul#709-50 Blaes Environmental I Additional Site Charactenzation TPHg or BTEX • Analytical results of soil samples collected from borehole DP-4 indicate detectable hydrocarbons from approximately 30 to 125 feet bgs Detectable concentrations of TPHg vaned from 11 to 1 6 snglKg and benzene ranged from 0 72 to 0 013 mg/Kg Despite these detections, the 80-foot and 110-foot samples revealed near non-detectable concentrations of BTEX r • Analytical results of soil samples collected from borehole DP-5 indicate detectable hydrocarbons at approximately 10, 30, 40, and 50 feet bgs Detectable concentrations of TPHg vaned from 1,900 mg/Kg at 30 feet bgs to 2 5 mg/Kg at 10 feet bgs Detectable concentrations ' of benzene ranged from 3 9 to 0 064 mg/Kg Despite the detection of Hydrocarbons at 10 feet bgs, the 20-foot sample did not contain detectable concentrations • Analytical results of soil samples collected from borehole DP-6 indicate low concentrations of ' hydrocarbons at depths of approximately 50, 70, 110, and 125 feet bgs The sample from approximately 125 feet bgs contained the highest concentrations of hydrocarbons of samples from the borehole with 4 0 mg/Kg TPHg and 0 35 mg/Kg benzene The samples collected at 30, 60, 90, and 120 feet bgs did not contain detectable concentrations of hydrocarbons • Analytical results of soil samples collected at approximately 35 to 60 feet bgs from soil boring MW-IA did not contain detectable concentrations of hydrocarbons • Analytical results of soil samples from soil boring MW-4A indicate detectable hydrocarbons from approximately 30 to 70 feet bgs The 50-foot sample, which consisted of clay, only contained MTBE at a concentration of 0 0070 mg/Kg This is dust above the detection limit of ' 0 0050 mg/Kg The samples collected at 60 and 70 feet bgs contained detectable concentrations of TPHg and BTEX The highest concentrations of TPHg and BTEX in soil from DP-4 were ' found in soil from approximately 60 feet bgs ' 4 1 5 Source Area and Plume Based on the cross sections, the analytical results and the plan view of the extent of hydrocarbons shown ' on Figure 8, the source area of hydrocarbons appears to be an elongated elliptical pattern associated with the former western dispenser island The plan view of the extent of hydrocarbons in soil (Figure 8) also 16