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be appropriate. Changes could include monitoring parameters, sampling or analytical <br />methods, frequency of monitoring, or the number and location of monitoring points. A <br />reduction of the current monitoring requirements would be made only after a review of <br />the data demonstrates that the current monitoring requirements are: <br />1) redundant <br />For example, where other monitoring locations or data already provide adequate <br />monitoring coverage, a reduction in monitoring could be appropriate. <br />2) not producing reasonable data quality or quantity <br />For example, where a monitoring well appears to be contaminated or does not <br />produce enough water to be consistently sampled, or in a case where data for a <br />specific parameter is not adding any substantive value to the monitoring program, <br />a reduction in monitoring could be appropriate. <br />3) cannot reasonably be continued due to field conditions or technical <br />considerations <br />For example, in a case where high TDS concentrations in a well continually foul <br />automatic recording equipment installed in the well or where a blockage in a <br />wellbore precludes sampling the well, a reduction or substitution in monitoring <br />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 <br />monitoring 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 <br />operations have ceased or changed in a way that there is no longer a substantive <br />potential to affect groundwater in the area, a reduction in monitoring could be <br />appropriate. <br />If EPA finds that an addition, reduction, or substitution in monitoring is warranted based <br />on the 5 criteria listed above, such changes maybe made to the Water Monitoring Plan as <br />a minor modification of the Permit. <br />(5`'' paragraph, modified 6`'' paragraph) . The permittee will monitor a network of <br />monitoring well completions for the 0-5 year mine panel. Monitoring well completions <br />will be located in the Uinta Formation, A-Groove, B-Groove, and Dissolution Surface. <br />Some of the monitoring well completions will be grouped together as nested or <br />co-located monitoring wells. <br />(6`'' paragraph, modified 7"'paragraph) The monitoring wells for the initial five (5) year <br />panel are positioned up-gradient, down-gradient, and cross-gradient of the mine panel. <br />FINAL: Modification No. 9, UIC Area Permit No. CO30858-00000 <br />Page 10 of 46 <br />