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foundation and membrane can be designed to eliminate the possibility <br />of refuse leachete coming into contact with the ground water." <br />The applicant proposes a placement of between one and two feet of plus <br />four inch processing waste immediately above the impermeable membrane.. <br />The purpose for the placement of this course waste material is to <br />provide a "wick" underdrain to collect any effluent that might <br />infiltrate the surface of the pile. In order to qualify for this use, <br />the proposed waste material will have to be demonstrated to be durable. <br />Obviously, the waste could not be tested prior to its becoming <br />available. In response to earlier Division adequacy comments, the <br />applicant has amended the permit application to include the following <br />commitment: <br />"When coarse refuse to be used to construct the permeable drain is <br />first generated, testing will be conducted to indicate its <br />durability. Results of these tests will be submitted to CMLR upon <br />receipt. If the requirements at CMLR are not met, an alternate <br />source of durable material will be provided." <br />(Page 2026A, Amended Permit Revision Application.) <br />The applicant assumes material strength values for the processing waste <br />material in completing a stability analysis of the proposed pile's <br />configuration. The assumed material strength values are obtained from <br />MESA and Bureau of Mines Research Reports, and represent commonly <br />referenced material values for coal processing waste. The applicant <br />commits, within the amended permit revision application revision, to <br />testing the processing waste material when it becomes available, as <br />follows: <br />"When refuse is generated, analysis will provide accurate values of <br />physical properties to be expected. Since these more accurate <br />values will be obtained while the refuse area is small and has no <br />stability problems, designs can be evaluated to assess the <br />appropriateness of parameters used in stability analysis. If <br />significant changes to the design of the refuse area are warranted, <br />CMLRB will be notified." <br />(Page 2-28, Amended Permit Revision Application) <br />The Division, however, must require submittal of these test results, in <br />any case. The Division will judge whether amendment of the stability <br />analysis and the plan are then warranted. For this reason, the Division <br />finds it necessary to impose the following stipulation upon the <br />revision's approval: <br />Stipulation No. 14 <br />THE DIVISION REQUIRES SALT CREEK MINING TO COMPLETE APPROPRIATE WASTE <br />SHEAR STRENGTH TESTS AND TO SUBMIT THE RESULTS OF THOSE TESTS TO THE <br />DIVISION FOR REVIEW AND APPROVAL, IMMEDIATELY FOLLOWING THE AVAILABILITY <br />OF REPRESENTATIVE COAL PROCESSING WASTE REFUSE MATERIALS. IF <br />SIGNIFICANT MATERIAL STRENGTH VARIATION OCCURS BETWEEN THE ACTUAL TEST <br />RESULTS AND THOSE VALUES ASSUMED IN COMPLETING THE STABILITY ANALYSIS <br />INCLUDED WITHIN THE AMENDED PERMIT REVISION APPLICATION, THE DIVISION <br />-34- <br />