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1 ! 1 t 11 f 1 ! I 11 November 2004 AGE-NC Project No 02-0962 Page 9of14 i I r Hydrogeologic Unit 2 (HU2) at the top of the current saturated zone, extends from 30 feet to N approximately 38 feet bsg and is composed of silty sand to sand type soils Hydraulic conductivities for HU2 generally ranged between 1 x 10-2 and 1 x 10 5 cm/s HU2 is characterized by generally lower R pore pressures and is classified as a flow unit Hydrogeologic Unit 3 (HU3) extends from 38 feet to approximately 45 feet bsg and is dominantly composed of stiff, fine-grained soils, clayey silts, silts and silty clays Hydraulic conductivities for these soil types generally ranged between 1 X 10 4 and 1 x 10' cm/s for clays, silts and stiff, fine- grained soils HU3 is characterized by varying pore pressures ranging between moderate and high and is characterized as a confining layer Hydrogeologic Unit 4 (HU4) extends from 45 feet bsg to approximately 50 feet bsg, HU4 is I composed of silty sand to sand type soils Hydraulic conductivities for HU4 generally ranged between 1 X 10 2 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) extends from 50 feet to approximately 70 feet bsg and is composed • dominantly 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 ranged between 1 X 10-5 and 1 x 10' cm/s for clays, silts and stiff, fine-grained soils HU5 is characterized by varying pore pressures ranging between moderate and very high and is characterized as a confining layer Hydrogeologic Unit 6 (HU6) extends from 70 feet bsg to 82 feet bsg and is composed of silty sand to sand type soils Hydraulic conductivities for HU6 generally ranged between 1 X 10 z and 5 0 cm/s HU6 is charactenzed by very low pore pressures, and is classified as a flow unit Hydrogeologic Unit 7 (HU7) extends from 82 feet to total depth of the boring (100 feet bsg) and is composed dominantly�of stiff, fine-grained clayey silts, silty clays and clay, A thin cemented sand is encountered at approximately 94 to 95 feet bsg Hydraulic conductivity generally ranged between v 1 X 10 5 and 1 X 1015 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 characterized as a confining layer' CPT lithographic data is provided in Appendix C Hydrogeologic units are,depicted in cross y ,r I sectional view A-A' (Figure 4) E ru F f r 1 « + 1 ` 1 I 1 II I I 1 v I 1 Advanced GcoEnvi ron mental,Inc ! s r I 5 I rl 1 I I e n r