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j ~i 9 <br />i <br />I':neces:sary to keep the height of this cut to a minimum as it is <br />,r iilocat:ed immediately below the unstable slope as discussed' <br />earlier. Access road cuts of any important height will have to be <br />~.supparted as well. <br />%iI 4. If the ground water conditions do not improve prior and <br />?Iduring the construction period, it might be necessary to imple- <br />i <br />ment drainage procedures or other methods to facilitate the <br />~~ excavations of all cuts that are deeper than the depth of the <br />ground water. Drainage might also be necessary if the design of <br />jindividual retaining structures is not economically or techni- <br />I~cally feasible. <br />~f <br />~, 5. As a minimum corrective measure, it was recommended that <br />i~ <br />.!the set of five proposed mine entries be relocated to the east to <br />avoid the large surficial slide above our boring P1; we under- <br />stand that ARCO Coal Company decided to relocate all entries 100 <br />!feet to the east. <br />- ~~ <br />j ~~ 6. As it will be necessary to design the mine portal cut at <br />~ ~ a limited height, the mine tunnels' sections adjoining the por- <br />I <br />i tals will be driven in soils, with a low overburden; special <br />~~nneling methods might be required within these sections. <br />~~ <br />i 7. Any additional structures or facilities located within <br />'ithe landslide areas will have to be designed so that they do not <br />~~decrease the stability of the area; special foundations may be <br />jl required. <br /> <br /> <br />