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TABLE 1 <br /> Generalized Hydrostratigraphy Near 233 Parallel Avenue <br /> Typical <br /> Depths Generalized Hydrostratigraphic Column <br /> (bgs) <br /> 0 -25 feet UNSATURATED ZONE silt, clay, and sand <br /> 25 - 70 feet B Aquifer silt and sand <br /> UPPER <br /> 70-85 feet SAND Aquitard silt and clay <br /> ZONE <br /> 85 - 120 feet A Aquifer sand and gravel <br /> 120- 140 feet Aquitard clay <br /> 140- 160 feet C1 Aquifer sand and silt <br /> 160- 180 feet CLAY Aquitard clay <br /> 180- 190 feet ZONE <br /> C2 Aquifer sand and silt <br /> 190-200 feet Aquitard clay <br /> LOWER <br /> 220--> feet SAND D Aquifer sand and gravel <br /> ZONE <br />