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' <br /> infiltration of the water into the spoil material. The <br />I- ' udnerdrain system shall be protected by an adequate filter <br /> <br />~ and shall be designed and constructed using standard <br />I geotechnical engineering methods. <br />I ~ COMMENT: An underdrain system for the coal disposal area <br /> has been designed to control seepage and water levels within <br />I the disposal area. The specific design details are provided <br /> on Figure 9. <br />I ~ Ru 4.09.1(14) The foundation and abutments of the fill <br />~ shall be stable under all conditions of construction and <br />I <br />- operation. Sufficient foundation investigation and <br />' laboratory testing of foundation materials shall be <br /> performed in order to detrmine the design requirements for <br />I stability of the foundation. Analyses of foundation <br />~ conditions shall include the effect of underground mine <br />I <br />- workings, if any, upon the stability of the structure. <br />' COMMENT: See comments under Section 4.09.1(1)(b). <br /> RiilP 4.09.1(15) Excess spoil or underground development <br /> <br /> waste may be returned to underground mine workings, but only <br /> with a disposal program approved by the Division and in <br /> compliance with the applicable requirements of MSHA upon the <br />' basis of a plan submitted under 2.05.3 (8)(3). <br /> COMMENT: This technical revision does not pertain to return <br /> <br /> of development waste back to the underground mine; <br /> therefore, this section is not application. <br /> <br /> R11~PR 4.09.2 = 4.09.4 Valley Fill, Head of Hollow Fill, and <br />' Durable Rock Fills. <br />w <br />-~ 34 <br />