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10Site Background Information - Guardmo and Crawford <br /> Page 6 of 6 <br /> of sandy material (sand and fine- to coarse-grained sand) This zone exhibits uniformly low pore <br /> Pressures and may be considered a flow unit <br /> HU4 - Extending from 55 feet to approximately 70 feet bsg, HU4 is composed primarily of thin, <br /> alternating layers of silty material(silt, and silt with clay) <br /> HUS - Extending from 70 feet to approximately 80 feet bsg, HU5 is composed primarily of layers <br />' of sandy material(silty sand, sand, and fine- to coarse-grained sand) This zone exhibits uniformly <br /> low pore pressures and may be considered a flow unit <br /> li <br /> t <br /> r <br /> • <br /> Advanced GeoEnvironmental Inc <br />