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Insurance Rate Map, U.S. Dept. of Housing and Urban Development, May 15, <br /> 1980). Areas designated as Zone C are areas of minimal flooding that lie outside <br /> the 100-year and 500-year floodplains. <br /> Portions of the site along the North Branch of Little Johns Creek are designated in <br /> Zones A and B. Zones A and B represent those areas that are affected by the <br /> 100-and 500-year floods, respectively. The North Branch will, however, be <br /> realigned to the north and west of the existing Austin Road Landfill. The <br /> realignment of the North Branch was addressed in the HR for the AustinRoad <br /> Landfill Expansion Project (ESA, 1994). The EIR identified the realignment of the <br /> North Branch as a significant impact, but concluded that relocating the stream and <br /> enhancing habitat values was preferred to maintaining the stream in its present <br /> alignment, subjecting the stream to potential surface water contamination from the <br /> existing Austin Road Landfill. -The EIR concluded that implementation of'the <br /> mitigation measures would.reduce the impact.10 less.than significant..j:evels..,The <br /> Stockton City Council certified the EIR for the Austin Road Landfill Expansion on <br /> September 6, 1994. <br /> Once the North Branch is realigned, the floodplain areas will be eliminated from <br /> within the landfill footprint.. F.lood.plain..area.that is offset will provide an <br /> equivalent capacity to existing conditions. Right-of-way has been dedicated to the <br /> Reclamation Board for the"new alignme'rtt a`n&dedicated floodplain areas"The <br /> Reclamation Board will abandon the right-of-way for the current alignment. <br /> 3.7 HYDROGEOLOGY <br /> 3.7.1 REGIONAL HYDROGEOLOGY <br /> The Forward Landfill is located in the San Joaquin hydrologic basin. Aquifer <br /> materials within the basin consist predominantly of sand mixed with clay and sift <br /> layers. <br /> Before the early 1960's, groundwater in the area typically flowed to the west. <br /> Since that time, heavy pumping in the Stockton area caused a northerly <br /> component of flow to develop. Salt water intrusion from the west has resulted in a <br /> shift in pumping from west Stockton to east of Stockton, and a resulting <br /> modification in groundwater flow to the northeast. Based on groundwater <br /> elevation contours published by the San Joaquin County Flood Control and Water <br /> Forward Landfill jTD 3-10 <br /> L:\Allied\2000.193\Reports\fi nalj td:Sec-3.0:08/20/01 <br /> BRYAN A.STIRRAT S ASSOCIATES <br />