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on the northeast and Western Pacific Railroad on the southeast. Areas <br /> surrounding the Depot are primarily agricultural : orchards, pasture lands, <br /> and scattered rural residential land. <br /> 1.2.1.2 Topography on the Depot is essentially flat, sloping gently <br /> downward to the north-northeast. Ground elevations range from 70 feet <br /> above mean sea level (MSL) at the northern corner to about 110 feet MSL at <br /> the southern corner. Structures and pavement cover..most of the surface <br /> area of the Depot. The dominant structures are 24 warehouses, typically <br /> about 200 by 1000 feet in size, associated with -the Depot' s function as a <br /> major logistics and supply center, as shown on Figure 1.2-3. Numerous <br /> smaller buildings house administrative, maintenance, and operational <br /> functions, mostly on the northern end of the Depot. Most of the areas <br /> between and around the warehouses are paved with asphalt, as are most of <br /> the open storage areas. Generally, unpaved open areas are covered with <br /> gravel . <br /> 1.2.1.3 The relevant geology of the Depot includes the Upper Tulare Zone <br /> and the Corcoran Clay Zone. The Upper. Tulare Zone extends from the <br /> surficial soils to a depth of approximately 200 feet. This is the zone in <br /> which the RI has been conducted. It consists of interbedded lenticular <br /> gravels, sands, silts and clays, vrith rapid lateral and vertical variation <br /> in grain size. The Corcoran Clay Zone lies below the Upper Tulare Zone, <br /> and consists of aVwell-sorted diatomaceous greenish to bluish lacustrine <br /> clay, approximately 80 to 100 feet thick. <br /> 1.2.1.4 The relevant hydrogeology of the Depot concerns the groundwater in <br /> the Upper Tulare Zone. Although this zone is extremely heterogeneous on a <br /> small scale, it appears to behave as a single hydrostratigraphic unit on a <br /> large scale, and is bounded below by the relatively impermeable Corcoran <br /> Clay Zone. The water table lies at a depth of approximately 15 feet, and <br /> slopes gently towards the north-northeast. Generally, the average linear <br /> velocity of groundwater in this aquifer is estimated to be in the range of <br /> 50 to 150 feet/year, towards the north-northeast. <br /> 1-5 <br />