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a° <br />�E c <br />of o <br />90 <br />9. <br />3 v <br />1 <br />go - <br />~I � <br />E <br />EL. 6535: <br />�AS-BUILT PHASE 1B <br />/ COLLUVIUM BUTTRESS <br />/ I <br />EL. 6490 <br />ROCK UNDERDRAIN <br />AS -BUILT y SURVEYED BEDROCK SURFACE <br />PHASE 1A BUTTRESS ^ r <br />t <br />i I <br />j COAL /SHALE SEAM <br />(APPROXIMATE) <br />i <br />i <br />3 +00 4 +00 5+00 6 +00 <br />2.5 <br />APPROXIMATE REFUSE <br />SURFACE <br />6675 <br />6650 <br />6625 <br />6600 <br />6575 <br />6550 <br />6525 <br />6500 <br />6475 <br />6450 <br />6425 <br />6400 <br />6375 <br />6350 <br />7 +00 8 +00 <br />FIGURE 7 <br />MODIFIED PHASE 1B BUTTRESS <br />DESIGN SECTION <br />