Laserfiche WebLink
location and geometry of the unsaturated soil horizon or vadose <br /> zone; the uppermost wa.tar, bearing soil horizon, or the phreatic <br /> r� <br /> y` aquifer; a confining layer or aquitard; and a deeper confined <br /> aquifer. The general relationships of the five soil zones are <br /> graphically presented on <br /> geologic cross-sections A-A', B-B', C- <br /> C', and D-D' to illustrate the hydrogeology of this site. The <br /> locations and orientations of geologic cross sections are shown <br /> on Figure 5. <br /> r <br /> w y Changes in depositional energy are prominent throughout the site � <br /> as. evidenced by soil lithologic transitions with depth. The <br /> generally fine-grained materials observed in the unconsolidated . <br /> s <br /> sediments suggests that the soils were deposited by low energy <br /> processes. It is most likely that the near surface sediments at . <br /> the site comprising zones l.through 5 resulted from a flood plain <br /> depositional environment and are the alluvial fans and terraces <br /> associated with erosional processes affecting the Sierra Nevadas . <br /> to the east. . <br /> Geologic cross section A A' Figure 6, graphically depicts the <br /> vertical variation of soil ';Ypes from northwest to southeast. <br /> The uppermost soil horizon, zone 1 is comprised of sandy silts <br /> to silty and clean sands. These materials exhibit relatively good <br /> horizontal and vertical permeability. Zone 2 is comprised of <br /> finer grained .clayey materials, <br /> which would inhibit downward ! <br /> -_ --- migration o -- uds. -Zone-2--is-missin -- -- - ---- --- - - - <br /> ffluids q-near formex well RW-1. it <br /> was eroded away by- a NNE-SSW paleo-channel, as shown in Figure 7. <br /> This allows direct communication of zones 1 and 3 in this area. <br /> � 1 li <br />