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0 <br /> <br /> VI. SUMMARY AND CONCLUSIONS <br />' ' <br /> Morrison Quarry appears to continue in general <br />Development of Aggregate Industries <br /> accordance with the approved Mine Plan. Mining is continuing in the North Quarry and is <br />' complete in the Central Quarry. Mining is in accordance with the Observational Method <br /> presented and approved in the permit amendments and technical revisions. Mining in the North <br /> Quarry has varied slightly from the phasing presented in Amendments Nos. 4 and 5 to improve <br /> operational considerations and to provide for adequate mining safety for personnel. <br /> In the Central quarry, the overall slope of the east side of the quarry did not exhibit visible <br /> instability. Localized instabilities exist on individual benches. Moderately dipping foliation <br />' jointing combined with other continuous joints has created localized slip surfaces that have <br /> resulted in lost of portions of individual benches and non-vertical highwalls during mining, and <br /> the potential for other localized losses in the future. The overall slopes on the west side, and <br />' north and south ends did not exhibit visible instability. On the east side of the Central Quarry, <br /> the repaired slope remained stable based on periodic optical survey monitoring. <br />In the North Quarry, the new cuts to final highwall and bench configurations are located low on <br />the north side and on the west side. The overall slope of the northern and western sides of the <br />quarry did not exhibit visible instability. Localized instability exists on individual benches. <br />The rock mass in the North Quarry is in "competent" condition, with localized "poor" <br />conditions located in a zone of shearing and faulting. Mining was active in the east side of the <br />North Quarry, but since these areas are not to the final configuration they were not evaluated. <br /> <br /> <br /> <br /> <br /> <br />LJ <br /> <br />1 <br />1 <br />