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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 maybe made to the Water Monitoring Plan as a Minor Modification <br />of the Permit. <br />Proposed UIC permit chances for Ground-water Monitorinc: <br />• Part II, A (3), Cavity Development, 4th Paragraph is proposed to be changed as follows: <br />Current language: <br />The injection fluid and production fluid pipelines shall be equipped with sampling ports to facilitate <br />periodic collection of samples for chemical analysis. Injection fluid samples shall be collected from the <br />pipeline immediately upstream of where the pipeline branches to feed all solution mining wells. <br />Production fluid shall be sampled on the production trunk pipeline prior to entering the steam stripper. <br />Samples of both the production and the injection fluid shall be collected and analyzed (for WQ2 <br />Parameters, Table 3), according to Section 4.0 Process Monitoring of the Ground Water, Surface Water <br />and Process Monitoring Plan dated December 23, 1999, prepared by Agapito Associates, Inc. (the Water <br />Monitoring Plan). <br />Proposed laneuaee: <br />The injection fluid and production fluid pipelines shall be equipped with sampling ports to <br />facilitate periodic collection of samples for chemical analysis. Injection fluid samples shall be <br />collected from the pipeline upstream of where the pipeline branches to feed all solution mining <br />wells. Production fluid shall be sampled on the production trunk pipeline prior to entering a gas <br />separator. Samples of both the production and the injection fluid shall be collected and analyzed <br />according to the Ground Water, Surface Water, and Process Monitoring Plan (the Water <br />Monitoring Plan), Appendix I. <br />• Part II, A (3), Cavity Development, 5th Paragraph is proposed to be changed as follows: <br />Current lanauaQe: <br />Monitoring of water quality and water level (see Section 2.0 of the Water Monitoring Plan) shall occur <br />at least once per month for monitoring wells located in the mine panel. The monitoring wells listed in <br />the Plan shall be monitored as provided in Section 5.0. Five (5) quarters of additional data shall be <br />collected prior to the commencement of operations. The permittee must collect this additional baseline <br />data for the Alluvial Aquifer, the Upper Aquifer (A-Groove and Uinta Formation), and the Lower <br />Aquifer (B-Groove and Dissolution Surface). Additional monitoring wells maybe deleted or added to <br />the monitoring program, if necessary, as development of the commercial solution mining well field <br />progresses, or as warranted by monitoring results. This will be done by modifying the Water <br />Monitoring Plan. <br />Draft Addendum to SOB For Modification No. 9, UIC Area Permit No. C030858-00000 Page 23 of 27 <br />