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Site Background Information: Larry's Auto Page 4 of 8 • CPT-7 was sampled between 71 feet and 75 feet bsg, between 81 feet and 85 feet bsg, between 109 feet and 113 feet bsg,between 134 feet and 138 feet bsg,between 159 feet and 163 feet bsg, and between 180 feet and 184 feet bsg; • CPT-8 was sampled between 63 feet and 67 feet bsg, between 104 feet and 108 feet bsg, between 126 feet and 130 feet bsg,between 159 feet and 163 feet bsg,between 178 feet and 182 feet bsg, and between 189 feet and 193 feet bsg; and • CPT-9 was sampled between 66 feet and 70 feet bsg, between 113 feet and 117 feet bsg, between 153 feet and 157 feet bsg,between 180 feet and 184 feet bsg,and between 186 feet and 190 feet bsg. Soil samples were collected from specified depth intervals (zones) based on the acquired CPT lithologic data indicating favorable conditions for sampling. Soil samples were collected from CPT boring locations at the following intervals: • CPT-7 was sampled between 59 feet and 60 feet bsg; and • CPT-8 was sampled between 154 feet and 155 feet bsg. Soil descriptions from the computer-generated CPT lithologic logs were integrated with previous subsurface soil descriptions and the hydrocarbon impact to ground water and soil was quantified by laboratory analysis of the ground water and soil samples. Generally, silt, clay, clayey silt, silty clay, sandy silt, silty sand, and sand were encountered from 5 feet bsg to approximately 100 feet bsg; one soil sample, collected at 60 ft bsg in boring CPT-7, was described as a greenish-brown coarse sand.A distinctive interval consisting primarily of sand, silty sand,sandy silt,and gravelly sand,as well as some silty clay,clayey silt,and silt,was identified at depths between approximately 100 feet and 140 feet bsg.From 140 feet bsg to the total depths of the borings clayey silt, silty clay, silt,cemented sand, sand, silty sand, sandy silt,and gravelly sand were identified;one soil sample,collected at 155 feet in CPT-8,was described as a dark gray sandy silt. HYDROGEOLOGIC MODEL A hydrogeologic unit (HU) is defined as a body of rock or sediment that has hydrogeologic characteristics(i.e. hydraulic conductivity, pore pressure, etc.) that make it distinct from surrounding bodies of rock or sediment, or a part of a body of rock that forms a distinct hydrologic unit with respect to the flow of ground water. A `flow unit' may be defined as a hydrogeologic unit and is characterized by significantly greater hydraulic conductivity values than overlying and underlying Advanced GeoEnvironmental,Inc