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Morita Brothers 1 1 May 6, 1992 <br /> ur <br /> rM� <br /> 1 <br /> �s <br /> TABLE-3 <br /> SUMMARY OF SOIL ORGANIC VAPOR CONCENTRATIONS <br /> (values in parts per million) <br /> Sample Depth feet TH-tL TH-2 I TH-3 I TH-4 I TH-5 I TH-6 TH-7 <br /> 5 ND 500 ND ND ND ND ND <br /> ' 10 ND 500 100 ND ND ND ND <br /> 15 25 250 300 1000 ND ND ND <br /> ' 20 300 900 350 2000 ND 20 ND <br /> 25 350 750 200 100 ND 20 ND <br /> ' 30 200 2000 200 200 ND 20 ND <br /> 35 350 1000 300 180 ND ND ND <br /> ' 40 200 ND 1 60 80 50 ND <br /> 45 60 60 60 60 50 60 <br /> 50 60 60 60 <br /> 55 60 <br /> ND Not detected <br /> As Table I indicates, the soil vapor concentrations detected in the soil samples <br /> obtained from borings Soil vapor concentrations were detected in boring TH-1 at <br /> elevated concentrations to a depth of 40 feet, and in boring TH-2 to a depth 35 feet <br />' These field readings are collaborated by the analytical results for the volatile <br /> aromatic benzene presented below <br />' 3 5 Laboratory Analytical Results <br /> Three of the thirty samples analyzed contained detectable levels of total purgeable <br />' hydrocarbons (TPH) as gasoline TPH as gasoline was detected at a concentration of <br /> 0 54 mglkg at a depth of 40 feet in boring TH-1, which was slant drilled 250 to the <br /> south from the north side of the 5,000 gallon unleaded gasoline tank excavation TPH <br /> as gasoline was not detected in boring TH-1 in samples from 25, 30, 35, 45, 50, and 55 <br /> feet TPH as gasoline was detected at a concentration of 0 81 mg/kg at a depth of 35 <br /> feet in boring TH-3, which was drilled 10 feet northwest of boring TH-1 TPH as <br /> gasoline was not detected in boring TH-3 in samples from 15, 25, 45, and 50 feet TPH <br /> BB-8101-2 9204-E044 RPT <br />■ <br />