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•I <br /> Zone 3 is comprised of sandy silts, silty sands, and some clean <br /> sand. This horizon has a much greater vertical and horizontal <br /> f 1.4 <br /> permeability than overlying zone 2. The lower portion of zone 3 <br /> contains the cleanest sands, and is saturated by an unconfined <br /> phreatic water table aquifer. Zone 4 is a silty clay ; <br /> and clayey silt aquitard. Zones 2 and 4 are substantially less ; <br /> permeable than zones 1, 3 and 5. Zone 4 is apparently continuous <br /> across the entire site, as shown in Figure 6. <br /> Zone 5 is a confined aquifer underlying the site. This aquifer is ` <br /> comprisedof silty sands and sandy silts which have moderate � <br /> s <br /> vertical and horizontal permeabilities. The confinement of this <br /> fifIjgi aquifer under the site is the result of the low permeability of <br /> {sly <br /> � zone 4. # <br /> Geologic cross section B-B'; Figure 8; depicts the vertical <br /> variation of soils on a west to east cross-section. soils in <br /> 61 <br /> F =. this cross-section also show the layered soil environment and the <br /> presence of a paleo�-channel at the site. Zone, ]., the uppermost <br /> i silty sand to sandy silt horizon is underlain by zone 2 the less.. <br /> permeable clayey zone. Zone 3, the water-table aquifer at the <br /> site, is saturated in its the lower portion. Zone 4 is. a clayey <br /> §d _ <br /> silt aquitard separating zone 3 and zone S. Section B-BP <br /> shows that zone 4 is continuous across the site. <br /> Geologic cross sections G-C' and D-D°, Figures 9 and 10, run <br /> Elinorth-south They show the geologic relationships of the five � -- — <br /> 3 <br />�x soil zones and where the channels interconnect zones 1 and 3. i <br /> 10 <br /> b <br /> r yC <br /> r <br /> N <br /> ! <br /> t <br />