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Ms Margaret Lagono Project No 880-040 1A <br /> November 8, 2002 <br /> Page 9 <br /> of the test, TPHg, benzene, and MtBE concentrations were 640, 1 4, and 77 mg/m3, <br />' respectively <br /> INVESTIGATION-DERIVED WASTE DISPOSAL <br /> Drill cuttings, decontamination water, and well development and sampling purge water <br /> generated during the field investigation was contained for disposal in 55-gallon drums <br /> approved by the United Nations for transport of liquid and solid wastes The drums <br />' were stored at the site until ABCO Environmental removed the waste for disposal <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> TPHg or BTEX were not detected in soil samples from wells MW-4 or MW-5 TPHg <br /> were reported in soil at 20 feet bgs in on-site boring SB Deep at 37 mg/kg, and benzene <br /> was reported in soil at 15 feet bgs in boring SB Deep at 0 079 mg/kg MtBE was <br /> reported in soil at 15 (5 8 mg/kg) and 20 (3 8 mg/kg) feet bgs in boring SB Deep TPHg, <br />' BTEX, or the five oxygenates were not detected in soil from boring SB Deep at 55 feet <br /> bgs MtBE and TAME were reported in soil from well borings MW-4 and MW-5 at <br /> concentrations up to 4 5 and 0 042 mg/kg, respectively <br /> Benzene was reported 1n ground water from well MW-4 at a concentration of 1 1 µg/L <br /> MtBE and TAME were reported in wells MW-4 and MW-5 at concentrations of <br /> 1 <br /> 14,000 and 160 µg/L, and 18,000 and 150 µg/L, respectively <br /> 1 Based on the results of this investigation, the extent of MtBE, TAME, and TBA in ' <br /> shallow soil and groundwater remain undefined downgradient of the site The vertical <br />' extent of hydrocarbon impact appears to have been defined Wells MW-4 and MW-5 <br /> have been added to the quarterly groundwater monitoring and sampling schedule <br />' Downgradient of wells MW-4 and MW-5 is an active service station located at <br /> 3202 West Hammer Lane (BP Oil Station 411193) This service station currently has <br /> several monitoring wells that are part of an active investigation at that site, which <br /> 4 <br /> 1 f <br /> N IrancfplTrotectslProjects1880104011 a101101Assessment and Intenm Remedial Reportdoc <br />