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13.4.2.1 <br />Fire Prev~tion <br /> <br />The following is a list of steps taken to prevent the possibility of a <br />fire within the embankment at the Northern No. 1 refuse facility. <br />1. During construction, care was taken to remove all vegetation <br />and topsoil in the azea of refuse disposal. In some areas, as <br />much as 45 inches of Boil were removed. <br />L A watershed diversion ditch capable of handling the <br />ItiO year-Z4 hour storm was constructed entirely around the <br />refuse dump area to prevent nay water from outside the <br />disturbed area from entering the refuse embankment. <br /> <br />3. A trench drain approximately 15 feet deep was installed in <br />the\area near the toe of the embankment, lined with filter <br />fabric sad filled with rip-tap to prevent any groundwater <br />from percolating into the toe of the pile. <br />4. A groumdwater well monitoring program has been in use to <br />determine the levels of water in various areas neaz the <br />embankment. A downstream and upstream well are also <br />tested quarterly for water quality. <br />5. Because the fill material is not classified as durable rock, it <br />will be placed is lifts not to exceed 3 feet in thickness, and <br />moat be compacted to 85% of the ASTM D698 maximum <br />density. This density prevents water sad air infiltration into <br />the refuse. Testing of the compaction will be done on a <br />frequent basis at first so as to determine the beet lift <br />thickness and on a regular basis thereafter as the refuse <br />embankment grows. <br />r - ~ <br />6. For permanent reclamation, the refuse embankment will be <br />covered by the required amount of fill and soil. <br />13=16b ' y/a3/~y <br />