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IS <br /> The model presented is nate retatlonal and will be modified <br /> rP as more data is coIiected The four <br /> vertical zones identified are as follows (depths are approximate and can vary by several feet across <br /> 1 the site) <br /> I Vadose Zone-Extending from surface grade to 25 feet beg, the depth to the water table The vadose <br /> zone is predominantly fine grained material from surface grade to 25 feet bsg, with a coarse grain <br /> sand unit occurring between 25 feet and 30 feet bsg at CPT3 off-site The zone is characterized by <br />' low pore pressures <br /> Hydrological Unit 1 (HU1), at the top of the current saturated zone, extends from 25 feet to <br />' approximately 90 feet bsg and is comprised of silt and clay and characterized by predominantly high <br /> pore pressure <br />' Hydrological Unit 2 (HU2) extends from 90 feet to 110 feet bsg, HU2 is composed dominantly of <br /> silt or clay, with the lower contact on a sand layer with limited gravel content (HU3) The interval <br /> is characterized by pore pressure variations from low to moderate pore pressures <br /> Hydrological Unita (HU3) extends from 110 or 115 feet to 125 feet bsg, HU3 is composed <br /> g mP <br /> dominantly of sand layer with limited gravel content, over-laid by silt or clay The interval is <br />' characterized by pore pressure variations from low pore pressures This unit may be classified as a <br /> flow unit, based in the extensive nature of the sediment <br /> I <br /> • <br /> eldvanced GeoEnvironmental,Inc <br />