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~ 1~1~1 <br />• • <br />7 <br />E:'HIBIT D (Revised 4-28-78) <br /> <br /> staggered locations in the previously (1928-1956) quarried <br />' area between the plant and the flood ditch. A-band and other <br /> hi~~h calcium limestones will also be required especia]ly for <br />t the production of special cements. It appears that actual <br />' operation will be essential to final determination of several <br /> complex factors including those above. It will require a fev/ <br />' years to determine if additional quarries will be neeced to <br /> maintain blends for best efficiency of kiln and quarry opera- <br />' tions. Currently, unknown factors will determine the down- <br />' ward limit to which C-band and E-band reserves can be removed <br /> economically. <br />' The following calculation gives information on the size <br /> of the A-band as compared to the future C- and E-band quarry <br />' operations. <br /> The A-band quarry vrill have a total length of 28,000 <br /> feet depleted in 23 years, or an average advance of 1,220 feet <br />' annually. With an average width of 700 feet, this calculates <br /> to be about 20 acres per year. <br />' The C- and E-Land quarries have 5 to 6 times mare reserves <br /> than the A-band, per unit of length, within a total disturbed <br />' <br /> r,idth of 1,000 to 1,200 feet. By comparison, advance of the <br />' C- and E-band quarriec will be (1,220 ~ 5.5) 222 feet average <br /> per year. With the 46 percent increase in production, the <br />' 222 feet would be 325 feet or an average of 8.2 acres of newly <br /> disturbed land per year. <br />1 <br /> <br />