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whether pollution of surface 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 f it <br />3~~ locations are approximate <br />N <br />3~ Ditch B-2 <br />~ ' <br />.'a3% <br /> Pods of excess <br />26% <br />I-~ overburden <br />27°/ <br />8% ~ <br /> 0 <br />notch in ; o <br />highwall r ' ~ <br /> 0 <br />,,, <br />0 <br />0 .m <br />/, ; Section of B-1 <br /> . <br />be removed <br />L , .. . <br /> Area down to <br /> original grade <br /> <br />• area of ditch <br />- <br />~ et <br />should be - 6% to 8~ %- <br />straightened... <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 intertace. 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 />