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t M, LEE08H ILL-MEMENMOFF.INC. SITE INVESTIGATION: SOIL 3.1 SOIL SAMPLING Based on previous studies and mapping of the soil gas survey, eight soil borings were installed and soil samples taken on September 5 and 6, 1940, by LH for laboratory analysis within and adjacent to the former UST excavation and adjacent to the existing waste oil UST. Locations of these boreholes are shown an Figure 3 rwti Three of the eight soil borings SB2, SB3, and SB4 were drilled within the asphalt patch outline of the former UST excavation. These borings were drilled to total depths of 20, 35, and 37.5 feet, respectively, with discrete soil samples taken at 5 foot intervals. Soil borings SBI, S05, and S98 were drilled to total depths of 37.5, 20, and 30 feet, respectively, around the perimeter of the former excavation. Discrete soil samples were collected at 5 foot intervals from borings S35 and SB8. Boring SK was drilled as a continuous care. The core samples were laid out in sequential order, described and discrete grab .samples taken for laboratory analysis and UStS . �,. classification by sieve analysis. Soil boring SB7 was drilled to a total depth of 15 feet near the pipeline trench where the soil gas survey indicated possible petroleum hydrocarbon contamination. Discrete samples were collected for laboratory analysis in boring SB7 at 5 foot intervals. ;nil boring SB6 was drilled at the northwest end of the waste sail tank. This boring was drilled to a total depth of 35 feet with soil samples taken at 5 foot intervals. r Groundwater was encountered in soil borings SBI, SB4, and SB6 at a depth of approximately 36.5 feet. Soil samples collected at shallower depths were found to be dry, to slightly moist. After reaching the total depth of these borings, water quickly rose to a depth of 32 to 33 feet below the ground surface. Grab water samples were collected from these boreholes with either a bailer or a "hydropunch", (see Section 4, Site Investigation: Groundwater). Groundwater was not encountered in an; of the other five soil borings. Based on the Phase IA soil sampling results collected on September 5 and 5, 1990, three additional soil borings (MWI, MW2, and MW3) were drilled on September 20 and 21, 1990 to further define the soil contamination and for .subsequent ,. conversion to groundwater monitoring wells. As shown on Figure 3, these borings were drilled in a triangular pattern, centered around the east end of the �.r excavation. The monitoring well borings MW1, MW2, and MW3 were drilled to total depths of 44, 43, and 44 feet, respectively, with discrete sail samples taken at `- 5 foot intervals. Groundwater was first encountered in the soil borings for MW1, MW2, and 14W3 at a depth of 37 feet and water quickly rose to a depth of 31 to 34 t ' feet below the ground surface. (See Section 4, Site Investigation: Groundwater, -- ---- ------ - - for-further-discussion-on-these All drilling was conducted dry with no fluids added to the borehole or lubrication to the drilling equipment. A sampler attached to the drilling rods 7 .r�