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For example, in a case where high TDS concentrations in a well continually foul automatic <br />recording equipment installed in the well or where a blockage in a wellbore precludes <br />s~ mpling the well, a reduction or substitution in monitoring could be appropriate. <br />4. not cost-effective relative to the value of the monitoring information <br />For example, where other less costly methods provide a similar data quality and monitoring <br />value, a substitution of methods could be appropriate. <br />5 the information is no longer necessary to ensure the protection of USDWs <br />For example, if there is no longer a need for certain monitoring because operations have <br />ceased or changed in a way that there is no longer a substantive potential to affect <br />groundwater in the area, a reduction in monitoring could be appropriate. <br />If EPA finds that an addition, reduction, or substitution in monitoring is warranted based on the 5 <br />criteria listed above, such changes may be made to the Water Monitoring Plan as a minor <br />modification of the Permit. <br />• Part II, D, Monitoring, 6th paragraph of the section is proposed to be changed as follows: <br />Current lan¢ua~e: <br />The permittee will monitor a network of 25 monitoring well completions for the 0-5 yeaz mine panel. <br />Some of the monitoring well completions aze grouped together as nested or co-located monitoring wells <br />for the Uinta Formation, A-Groove, B-Groove, and Dissolution Surface. The Upper Aquifer will be <br />monitored at twelve (12) locations, the Lower Aquifer will be monitored at nine (9) locations, and the <br />Alluvial Aquifer will be monitored at four (4) locations. <br />Proposed laneua¢e: <br />The permittee will monitor a network of monitoring well completions for the 0.5 year mine panel. <br />Monitoring well completions will be located in the Uinta Formation, A-Groove, B-Groove, and <br />Dissolution Surface. Some of the monitoring well completions will be grouped together as nested <br />or co-located monitoring wells. <br />• Part II, D, Monitoring, 7th paragraph of the section is proposed to be changed as follows: <br />Current lanQUaQe: ' <br />The monitoring wells for the initial five (5) yeaz panel aze positioned up-gradient, down-gradient, and <br />cross-gradient of the mine pane]. The monitoring well layout for the Yankee Gulch lease site is shown in <br />Appendix I, along with the well summary of the Final Ground Water Monitoring Plan (dated December <br />23, 1999) as presented in Table 1 <br />Proposed laneuaee: <br />The monitoring wells for the initial five (5) year panel are positioned up-gradient, down-gradient, <br />and cross-gradient of the mine panel. The monitoring well layout for the Yankee Gulch lease site is <br />shown in Appendix I, along with a summary the formations to 6e monitored at each well <br />completion. <br />Draft Addendum to SOB For Modification No. 9, UIC Area Permit No. CO30858-00000 Page 26 of 27 <br />