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wSite Background Information Vanco Truck& Auto Plaza Page 4 of 6 on CPT soil behavior types(SBTs),range between 1 x 10 6 and 1 x 10 s centimeters per second(cm/s) for silty to clayey type soils This interval is characterized by generally moderate pore pressures Hydrogeologic Unit 2 (HU2) - At the top of the current saturated zone, HU2 extends from 30 feet to approximately 38 feet bsg and is composed of silty sand to sand type soils Hydraulic conductivities for HU2 typically vary between 1 x 10 Z and 1 x 10 s cm/s HU2 is characterized by generally lower pore pressures and is classified as a flow unit Hydrogeologic Unit 3 (HU3) - HU3 extends from 38 feet to approximately 45 feet bsg and is composed pnmarily of stiff, fine-grained soils, clayey silts, silts, and silty clays Hydraulic conductivities for these soil types generally range between 1 x 10' and 1 x 10 s cm/s for clays, silts, and stiff, fine-grained soils HU3 is characterized by varying pore pressures ranging between moderate and high and is identified as a confining layer Hydrogeologic Unit 4 (HU4) - HU4 extends from 45 feet bsg to approximately 50 feet bsg and is composed of silty sand to sand type soils Hydraulic conductivities for HU4 generally range between 1 x 10 z and 1 x 10 5 cm/s HU4 is characterized by generally lower pore pressures and is classified as a flow unit • Hydrogeologic Unit 5 (HU5) - Extending from 50 feet to approximately 70 feet bsg, HU5 is composed predominantly of stiff, fine-grained clayey silts, silty clays, and clay A thin silty sand to sand type soil is encountered at approximately 58 to 62 feet bsg and has characteristically low hydraulic conductivity Hydraulic conductivity generally ranges between 1 x 10 s and 1 x 10"cm/s for clays,silts,and stiff,fine-grained soils HU5 is characterized by varying pore pressures varying from moderate to very high, and is identified as a confining layer Hydrogeologic Unit 6(HU6)-HU6 extends from 70 feet to 82 feet bsg and is composed of silty sand to sand type soils Hydraulic conductivities for HU6 generally range between 1 x 10 z and 5 0 cm/s HU6 is characterized by very low pore pressures, and is classified as a flow unit Hydrogeologic Unit 7 (HU7) - Extending from 82 feet to total depth of the boring (100 feet bsg), HU7 is composed primarily of stiff, fine-grained clayey silts,silty clays,and clay A thin,cemented sand is encountered at approximately 94 feet to 95 feet bsg Hydraulic conductivity generally ranges between 1 x 10 5 and 1 x 10 " cm/s for clays, silts, and stiff, fine-grained soils HU7 is characterized by varying pore pressures ranging between moderate and very high and is identified as a confining layer SITE CONCEPTUAL MODEL Based on the data collected to date from soil boring installation and sampling, AGE has developed • Advanced GcoEnvironmental,Inc