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The sample results along the southern boundary of the excavation indicate low or non-detectable
<br /> contaminant levels. Sidewall sample SW-5 indicated a TPH gasoline level of 560 mg/Kg,
<br /> •, sample SW-6 indicated a gasoline level of 130 mg/Kg. Sample SW-7 indicated non detectable
<br /> Ievels for all analyzed constituents.
<br /> ' The eight bottom samples collected from the phase I excavation indicated non-detectable or very
<br /> g p
<br /> low gasoline and BTEX concentrations. Gasoline was detected at a level of 1.8 mg/Kg in bottom
<br /> sample 8-18', and the remaining seven samples indicated non detectable levels. Benzene was
<br /> detected in only two of the samples, 6-18.5' and 8-18', at levels of 110 µg/Kg and 24 Etg/Kg,
<br /> respectively.
<br /> The four soil samples collected from known or suspected contaminated material indicated levels
<br /> ' higher than derived from previous soil boring data. Soil boring data obtained in August, 1994,
<br /> indicated a maximum gasoline concentration of 4,200 mg/Kg in SB-1 at a depth between 12 and
<br /> 14 feet bgs. All four "pit" samples contained gasoline levels greater than 5,500 mg/Kg, with pit
<br /> sample 2-12' containing gasoline at 16,000 mg/Kg.
<br /> Table 1
<br /> ' Phase I soil excavation (Eastern portion)
<br /> Soil Sample Analytical Data
<br /> ' Analyte
<br /> Location Sample Benzene Toluene Ethyl Xylene TPH Gas PID
<br /> Number- (µg/Kg) (µg/Kg) Benzene (pg/Kg) (mg/Kg) Reading
<br /> Depth (gg/Kg) (ppm)
<br /> Bottom 1-19' ND ND ND ND ND 0.0
<br /> Bottom 2-18' ND ND ND ND ND 0.0
<br /> Bottom 3-18.5' ND ND ND ND ND OA
<br /> Bottom 4-19' ND ND ND ND ND 0.0
<br /> Bottom 5-19' ND ND ND ND ND 0.0
<br /> Bottom 6-18.5' 1 t 8.2 38 40 ND 0.0
<br /> Bottom 7-18' ND ND ND 7.7 ND 0.0
<br /> Bottom 8-18' 24 ND 36 150 1.8 0.0
<br /> Sidewall 1-12' 20,000 19,000 160,000 450,000 13,000 43
<br /> Sidewall 2-15' 1,200 3,600 22,000 58,000 2,200 387
<br /> Sidewall 3-15' 8,800 14,000 110,000 560,000 10,000 120
<br /> Sidewall 4-12' 9,300 8,700 89,000 500,000 7,700 763
<br /> Sidewall 5-14' 140 850 4,400 4,900 560 181
<br /> Sidewall 6-15.5' ND 240 2,100 630 130 115
<br /> Sidewall 7-14' ND ND ND ND ND 0.0
<br /> Sidewall 8-13' 49,000 110,000 99,000 400,000 7,400 258
<br /> Pit Interior 1-11' 17,000 9,000 71,000 190,000 5,500 462
<br /> I ' Pit Interior 2-12' 20,000 18,000 210,000 920,000 16,000 935
<br /> Pit Interior 3-14' 14,000 120,000 74,000 330,000 5,700 785
<br /> Pit Interior 4-12' ND 68,000 130,000 700,000 8,600 1 1120
<br /> ' NOTE: ND =Not detected above analytical laboratory detection limit.
<br /> American Geological Services, Inc.
<br /> CA95DE-029
<br /> ' 13
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