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whether pollution of surtace or subsurface water is occurring, the probability of <br />continued pollution, and the estimated cost of abating such pollution. <br />The inspection commenced with an introduction by the mine operator of the history <br />and an overview of the mining activities and reclamation conducted at the mine. The <br />Division described the three phases of bond release. <br />720 Pit Reclamation <br />The field portion of the inspection started at the center portion of the 720 pit. The <br />backfilled and highwall reduced slopes of the 720 pit were measured with an abney <br />level. The approximate location of the measurements are shown on the <br />map below. There were several areas that were not to the approved grade of 3.5:1 <br />(28.7%). The approximate location these slopes are marked on the map. <br /> 720 I'it <br />3~3~ ~ locations are approximate <br />N <br />7 <br />/ j <br />I <br />3 ~itcn B-2 <br />~ <br />~ <br />e/ <br />F~ <br />~°ro <br /> Pods of excess <br />26% <br />I--~ overburden <br />27/ <br />8°°/ ~ <br />0 <br />m <br />notch in `~ <br />;o <br />highwall 1 ' ~ <br />•~ <br />°Im° <br /> Section of B-1 <br /> be removed <br />C <br /> Area down to <br /> original grad <br />~~ <br />area of ditch <br />~ e~~ <br />should be <br />straightened , 6% to 8to 8-de <br />Settling cracks were noted along the west side of the 720 pit. Some of the cracks <br />were at lower side of the fill area and others were at the highwall reduction and <br />highwall fill interface. The thickness of backfill could be up to 200 ft. thick, so <br />consolidation and associated cracking could be expected to occur. The Division, to <br />be safe, thought it would be prudent for the operator to calculate a safety factor for <br />Marr Strip, Bond Release 2 May 24, 1994 <br />