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<br />79. This updated topographic information is based on LIDAR (Light Detection and <br />Ranging) data and is the best available information for determining the ground elevations <br />throughout the Bayport site. <br />80. In accordance with Harris County floodplain regulations, actual ground elevations <br />at a site are used, in conjunction with the 100-year flood level of the adjoining watercourse, to <br />determine the extent of the 100-year floodplain. <br />81. This new topographic information confirmed that the ground elevations at the <br />Bayport site have changed significantly from the elevations reported in both the Bayport DEIS <br />and FEIS, due primarily to the effects of land surface subsidence. <br />82. The 100-year floodplain at the Bayport site is determined by the 100-year flood <br />levels along the Bayport Ship Channel and Pine Gully, which have been determined to be at an <br />elevation of 12 feet above mean sea level. <br />83. According to the new topographic information for the Bayport site, significantly <br />more of the Bayport site is at or below elevation 12 feet than is currently shown in the FEIS. <br />84. According to the Bayport FEIS, only 7% of the Bayport facility is at or below the <br />elevation of 12 feet and in the 100-year floodplain. <br />85. When the new topographic information is considered,.over 20% of the Bayport <br />facility is below elevation 12 feet and in the 100-year floodplain. <br />86. The extent of the 100-year floodplain at the Bayport site is critical to the <br />determination of jurisdictional wetlands. <br />87. The new topographic data can also be used to identify swales, ditches and other <br />watercourses that may connect other wetlands at the Bayport site, outside of the 100-year <br />floodplain, to the adjoining navigable waters, thereby making these wetlands jurisdictional. <br />13. <br />