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U <br />• <br />to 182 compared with a limit of 15 for the unacceptable cat- <br />egory. This indicates the need for an adequate covering of <br />the waste rock material for effective reclamation. <br />Electrical conductivity measurements all fall within <br />the "good" category. The pH is generally high, ranging be- <br />tween 8.6 and 9.3 with an average of 8.87 for the three sam- <br />ples tested. pH is indicative of possible effects on water <br />quality; low pH materials could increase the solubility of <br />heavy metals, calcium, magnesium, sodium, and sulfates. <br />lde consider that because of the high coal content of <br />the waste pile, it must be considered combustible and de- <br />signed accordingly. The high SAR values measured also indi- <br />cate the need for adequate covering of the pile. However, <br />the chemical analyses generally indicate that the waste rock <br />will not be acid-forming and should not be toxic-forming. In <br />view of the considerable depth to ground water at the dis- <br />posal sites, the relatively impermeable character of the un- <br />derlying soils, and the limited size of the pile, it would <br />seem reasonable to eliminate the subdrainage system as al- <br />lowed under Section 4.10.3(5) of the CMLRS regulations pro- <br />vided the following conditions are complied with: <br />1. The depth to ground water is confirmed by moni- <br />toring throughout the period of snow melt <br />2. Appropriate construction and monitoring procedures <br />are maintained, as described in the Discussion and <br />Recommendations <br />3. A non-toxic cover of Low permeability is instal- <br />led to prevent seepage of direct precipitation <br />i- to t}le pile <br />• <br />- 19 - <br />ceaHroeo conwuuw, wc. <br />