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.~ EL1/1.1/1995 3:3 303-782- 'QB CDH WOCD WQCC PAGE 03 <br />~~~ ~ <br />~~ ~ ~ ~ <br />Based upon this conclusion, we would recommend that any approval for the use of Pond 4C water for <br />road dust suppression be granted by the DMG only if it Is certain that the application can be performed <br />without any surface runoff or discharge of this water and that any approval contain conditions prohibiting <br />such runoff. For examplo, DMG may want to put a requirement on the application that Pond 4C water <br />my be usedi~4t) hrs after the last reln event so that it Is certain that the ground is dry and will absorb <br />the water. It sj~o'uld be applied in such a manner that there is no puddling of waters. DMG may want to <br />require management practices which address how the material is applied so that the likelihood is low of <br />any water sntertng runoff. This could include limitations how it is spreyed, the rate at which it is applied <br />end the distance from any state waters. It is suggested that you expressy prohibit the discharge of the <br />water into state waters and that you require that a plan for minimization of any spills which have the <br />potential to enter state waters be included as well as the notification to lha of Colorado Department of <br />Public Health and Environment of any spill. <br />Of course, even if there is no surface runoff, there still is the potential for contamination of groundwater. <br />Since the DMG is responsible for controlling discharges to groundwater at mine sites, we will defer to your <br />assessment of the potential impacts from the road spraying. <br />Please contact me or Rich Horstmann with any questions. <br />co- Rich Horetmann, Permits and Enforcement Section, WOCD <br />Sereh Johnson, Permits and Enforcement Section, WOCD <br />c:wxsw,v~ruw~c.wro <br />