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• <br />tQINING REPORT <br />Method <br />i <br />The mining method has been described in the original permit <br />application. <br />Earthmoving <br />The Morrison and Baumgartner tracts contain approximately 221 ± <br />acres. Mining will affect about 201 acres. A total of about <br />4,300,000 tons of sand and gravel will be removed. Expected <br />production is 500,000 tons per year. Economic conditions and <br />the company's success in bidding jobs will affect the yearly <br />volume. Maximum annual surface disturbance will not exceed <br />7.0 acres. <br />Size of Areas - Phasing - Disturbances <br />The mining plan for the East Rigden Pit has been revised to <br />incorporate the Morrison and Baumgartner tracts and to treat <br />the total acreage as a unit. Site preparation and mining began <br />at East Rigden in the fall of 1979. Mining at the amended <br />East Rigden Pit is expected to last between 15 and 25 years <br />and will be completed in the following stages. <br />D-1 <br />