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. - - <br />^~Dan Mathews <br />-2- <br />December 31, 1986 <br />The acid-base potential and the pH analyses evaluate the acidity risk <br />differently. More sections of the column show a low buffering capacity than <br />show low pHs. The Eckman Park overburden analyses showed an average pH of <br />7.4; existing stream pHs on Foidel Creek average 7.85. Little Middle Creek <br />values are lower, but given the tendency of the water's pH to be slightly <br />higher than the overburden average, I would expect waters of neutral pH. <br />On the othe <br />of acid-bas <br />foot sectio <br />that mixing <br />that these <br />pit in the <br />anticipate <br />r hand, the section <br />e potential and pH <br />n fifteen (15) fee <br />would diminish the <br />sections will end <br />zone of saturation <br />any revegetation p <br />s of the column which appear to have exceedances <br />occur at the top of the column and in a 25-30 <br />t above the Wolf Creek seam. The operator claims <br />influence from these sections. I would think <br />up on the bottom and the top of the backfilied <br />and close to the rooting zone. Would you <br />roblems from overburden with an average pH of 6.1? <br />/vj r <br />6475F <br />