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Mr Jeff Wong Page 5 of 10 • with a catalytic converter, instrumentation for measuring air flow, air pressure/temperature, and volatile organic compound concentrations, and polyvinyl chloride piping and fittmgs for wellhead connections The test methodology is summarized below Test Well MW 1 The IC engine was used to apply a vacuum to test well MW 1 for two hours while the vacuum influence In wells VW1, MW2, MW3, and MW4 were observed Two influent vapor samples were collected for laboratory analysis from MW 1, one at the beginning and one at the conclusion of the test Test Well VW1 The IC engine was operated for four hours on test well VW1 while the vacuum influences in wells MW1, MW2, MW3, and MW4 were observed Two influent vapor samples were collected for laboratory analysis from VW1, one at the beginning and one at the conclusion of the test RESULTS OF INVESTIGATION Soil Lithology The lrthology of the borings in the northern portion of the site (MW10, MW 11, MW12) consisted primarily of silt and clay from the ground surface to the water table, which was encountered at approximately 67 to 70 feet bgs Several thin layers of sand were encountered in well MW10 at approximately 30, 46, and 51 feet bgs, in MW11 at approximately 11, 35, and 45 feet bgs, and in MW12 at approximately 40 and 43 feet bgs The water-bearing zone in wells MW10 and MW12 consisted primarily of silt, with some poorly graded sand, and the water-bearing zone in well MW11 consisted primarily of silty clay with some poorly graded sand The shallow lithology in wells MW13C and MW14B generally correlated well with the A Zone wells Deeper sandy zones were encountered in MW13C at approximately 104-114 feet bgs, 120- 134 feet bgs, and 185-220 feet bgs A relatively thick silt/clay bed was encountered in well MW13C from approximately 139 to 185 feet bgs Sandy soil was encountered in MW14B from approximately 81-90 feet bgs, and 110-124 feet bgs Boring logs for the newly )installed wells are included in Attachment A Cross sections of the site are shown on Figures 3 and 4 Soil Analytical Results No TPHg, BTEX, or gasoline additives were detected in bonngs MW10 and MW11 No TPHg or BTEX were detected in boring MW12 The soil sample collected from a depth of approximately 80 feet bgs In boring MW12 contained MTBE at a concentration of 0 37 parts per million (ppm) No MTBE was detected in the samples collected from 60 and 65 feet bgs in boring . MW12 G 1GROUNDZE\TULEBURG\RepoTtslHSA_Mud wells Report 2 doe