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PANOCHE BURN SITE REMEDIATION <br /> TOE DESIGN FOR FILL (NTS) <br /> Flow Line <br /> 100 year <br /> water level <br /> 60 mil HDPE <br /> 4 ft min. of <br /> \ on site cicy <br /> \ c° <br /> Ash Com pacted\ <br /> \�\\ Clay Fill <br /> "Clay Plug.. <br /> Anchor into <br /> Native Soil- �— Native Soils <br /> :D-15 Ft <br /> �'—Key Trench <br /> Figure 7. Panoche Toe Design L <br /> V-ditches at the edge of the canyon. By design, once the vegetative cover is established, the <br /> upper part of the cover will store part of the surface water until the native grass releases the <br /> water through evapotranspiration. <br /> The upland areas above the site were regraded to limit stormwater runoff into the site. The <br /> area of influence was reduced to approximately 20 acres. <br /> The earthen cover consisted of a monolithic 4- to 5-foot thick, low-permeability soil layer. <br /> Final cover soils from the northern plateau were first moisture-conditioned, then removed by <br /> scrapers and placed in thin (6- to 8-inch) lifts to form the individual layers. Each layer was <br /> then compacted relative to the maximum density determined according to ASTM D-1557. <br /> Compaction was obtained making alternate passes with a loaded scraper. The vegetative and <br /> foundation layers were compacted to a minimum of 85 percent relative, while the barrier <br /> layer was compacted to 90 percent relative. Figure 8 shows the general cover design for the <br /> top deck and slope covers. <br /> CIWMB 21 <br />