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<br /> <br /> <br />- As a result of the site being in the floodplain, floodwater will submerge the subject north fill area and therefore a <br />“release” via a failure of the embankment would be unlikely with only a small differential on either side of the <br />embankment. See attached cross sections. <br /> <br />Critical Sections <br />Civil Resources observed two sections of the north fill area that were constructed above grade as summarized below: <br /> <br />- West Section: A natural drainage swale exists on the north side of Walker North and this area represents <br />shallow man-placed fill location. The embankment in this area has an approximate base width of 250 feet and <br />maximum height of 5.0 feet (spillway el. 4946 and native grade at embankment el. of 4941 per Deere-Ault <br />profile and lidar data, final crest to be 4947). The top width is approximately 80 feet wide and further grading is <br />being performed to add more fill on the crest and on the downstream side of the embankment. <br /> <br /> <br /> <br />West Section looking East <br /> <br /> <br />- East Section: The northeast corner of the North Pond contains a fill area approximately five (5) feet above <br />native grade (based on lidar data, elevation 4942 and top of embankment 4947). This area has a 40-foot-wide <br />crest and three horizontal to one vertical (3H:1V) downstream side slopes. Civil Resource met with the SEO on <br />Tuesday June 1st, 2021 and concluded this is the critical breach section. <br />