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<br />in non-tributary2, highly-faulted, deep aquifers3. As outlined in DRMS's "Draft Policy and <br />Guidance Docurrient for Implementation of Ground Water Points of Compliance for Coal Mining <br />Operations in Colorado" (August 2002), site-specific compliance points may be established <br />when current points of compliance are both technologically infeasible and economically <br />unreasonable. Fluther, historic and future tributary and non-tributary ground water4 use at the <br />site is limited or non-existent and should be classified as such. <br />Colorado Water Quality Control Division (the Division) requirements include the establishment <br />of points of compliance in accordance with the following ground water monitoring guidelines: <br />• The establishment of a ground water monitoring point where ground water could <br />be impacted by the current mining operation for which quality standards could be <br />exceeded. <br />• The establishment of a monitoring point hydraulically down gradient from the <br />afiFected area. The point is to be located where acceptable modeling or analyses <br />indicate that water quality monitoring may be reasonably expected to detect <br />evidence of violation of applicable ground water standards by the operation. <br />Colorado Water Quality Control Commission (the Commission) may adopt site-specific points <br />of compliance if it determines that such points would: <br />• Protect human health and the environment, and that; <br />Thee existing points of compliance are technologically infeasible or economically <br />unreasonable after several considerations listed in Regulation 41.6(E). These <br />considerations include potential for migration of contaminant, hydrogeological <br />data and features, and the classified uses for any ground water or surface water <br />which could be impacted from the activity. <br />The Commission may also adopt site-specific ground water classifications. A classification of <br />"Limited Use and. Quality" is appropriate when criteria for the classifications of domestic use, <br />agricultural use, surface water quality, and potentially usable quality are not met. (Regulation <br />41.4(B)(5)(c)) <br />ZNon-tributary water -Ground water outside of the boundaries of any designated ground water basin, the <br />withdrawal of which will not, within one hundred years, deplete the flow of a natural stream at an annual rate <br />greater than one-tenth of one percent of the annual rate of withdrawal. <br />s Aquifer - A subsurface water-bearing geological structure capable of storing and yielding water to streams, <br />springs, and wells. <br />'Tributary Groundwater -All subsurface water hydraulically connected to a surface stream, the pumping of which <br />would have a measurable effect on the surface stream within one hundred years. <br />2 <br />