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Geosyntec° <br /> consultants <br /> Hydrostratigraphic B-Zone <br /> The top of the hydrostratigraphic B-Zone is typically encountered between <br /> approximately 105 to 115 feet bgs, and the base of the B-Zone is typically encountered <br /> between approximately 130 to 145 feet bgs. The saturated portion of the B-zone ranges <br /> from 15 to 40 feet in thickness. In general, the lithology of the hydrostratigraphic A- <br /> and B-Zones is similar. The B-Zone is characterized by fairly continuous sequences of <br /> silt and clay that contain a lower percentage of coarse-grained material compared to the <br /> A-Zone. Coarse-grained permeable intervals within the hydrostratigraphic B-Zone are <br /> typically thinner than those observed in the hydrostratigraphic A-Zone and are not as <br /> laterally continuous (LFR, 1999). <br /> Hvdrostratieranhic B/C-Zone <br /> The top of the hydrostratigraphic B/C-Zone is typically encountered at approximately <br /> 145 feet bgs and generally ranges between 10 and 30 feet in thickness. The <br /> hydrostratigraphic B/C-Zone consists primarily of hard, silty clay and appears to be <br /> laterally continuous, although it varies laterally in thickness and lithologic character <br /> (LFR, 1999). <br /> Hvdrostratig_raphic C-Zone <br /> The hydrostratigraphic C-Zone generally consists of a high percentage of relatively <br /> thick, permeable, coarse-grained sediments from approximately 150 to 300 feet bgs <br /> (LFR, 1999). <br /> 2.1.3 Occurrence and Movement of Groundwater <br /> Below summarizes the occurrence and movement of groundwater beneath the site <br /> within the water bearing units. For a detailed compilation of the most current water <br /> level measurements and elevations, refer to the Groundwater Monitoring Report for the <br /> Semiannual Period from January 1 through June 30, 2011 document (ARCADIS U.S. <br /> Inc. [ARCADIS], 2011). <br /> A-Zone <br /> The A-Zone aquifer is apparently partially, if not fully, confined as indicated by the <br /> depths of saturated soils observed in borings compared with static groundwater levels <br /> measured in wells installed in the borings and the response of the A-Zone aquifer to <br /> pumping(LFR, 2002). Groundwater-elevation measurements indicate that groundwater <br /> Pre-Design Investigation Work Plan 5 18.05.12 <br />