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II. H d~ologic Balance <br />A. Water Quality Standards and Effluent Limitations <br />1. The Division proposes to grant four small area exemptions from use of sediment <br />ponds due to the limited size of the area and due to the fact that ponds and <br />treatment facilities aze not necessary for the drainage to meet the effluent <br />limitations of Rule 4.05.2 and applicable State and Federal water quality <br />standazds for receiving streams and also due to the fact that no mixing of surface <br />drainage with a discharge from underground workings will occur. Three of the <br />small areas to be exempted aze shown on Map 2.05.3-12 and are located on the <br />westernmost portion of the permit azea where the terrain is undulating and these <br />areas cannot be made to drain to any sediment pond. The areas are 2.1 acres, 2.6 <br />acres and 0.9 acres, respectively. The last azea is located at the topsoil pile at <br />pond 007, (4.05.2(3)(b)(i)). <br />B. Sedimentation Ponds <br />Alternative design criteria and specifications have been approved for use in <br />sediment pond design and/or construction. This decision is based on a thorough <br />analytical demonstration by a qualified professional engineer that the resulting <br />sediment pond will be as environmentally sound and structurally stable taking <br />into consideration physical, climatological, other chazacteristics of the site, and <br />will conform to the impoundment performance factor of safety of 1.3. <br />(4.05.6(11)). <br />C. Acid-forming and Toxic-forming Spoil <br />The Division proposes to approve temporary storage of acid- and toxic-forming <br />spoil for more than 30 days. This decision is based on a finding that burial or <br />treatment of these materials within 30 days is not feasible and the delay will not <br />result in any material risk of water pollution or other environmental damage <br />(4.05.8(3)). See Section 2.04.6 for identification, mining plan contingencies, and <br />spoiUmine soil reconstruction plans (respectively) that address acid or toxic spoil <br />horizons. <br />D. Ground and Surface Water Monitoring <br />The applicant will conduct monitoring of ground water in a manner approved by <br />the Division (4.05.13(1)). The ground water monitoring plan is as follows: <br />a. WFC maintained and operated a ground water monitoring network a[ the New <br />Horizon 1 & 2 mining areas that consisted of 35 monitor wells. Each monitor <br />well was measured for static water level on a monthly basis. Some of these <br />wells aze still being monitored under the currently approved hydrological <br />19 <br />