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The operator shall investigate technologies for determining cavity shape and stability, and present the findings to EPA, BLM and DMG prior to solution mining. Comparisons to baseline geophysical evaluations from pillar well MWD-1 to each production well are anticipated to provide an indication of the cavity void area in each pillar-cavity profile and the condition of the oil shale debris in each cavity. The operator shall evaluate other appropriate technologies that emerge. The results of these studies and field tests with recommendations shall be supplied to EPA in the first Quarterly Report following their completion. A technology that is proven and approved through this process will be used in the future unless displaced by a better technology. 2. Monitoring Well Program. Monitoring of overlying USDW's shall be in accordance with 90 CFR Part 196.32 and Part 196.33. Samples and measurements shall be representative of the monitored activity. Five (5) calendar quarters of baseline sampling are required prior to commencing plant or mining operations unless the Director determines that a full five quarters are not needed to adequately characterize baseline conditions of the aquifers. (a) Freguency: Water quality samples from the lower Uinta Formation, A-Groove, and B-Groove shall be analyzed: 1) monthly for constituents provided in the water quality short list, Table 2 of the Water Monitoring Plan, and 2) quarterly for constituents provided in the water quality long list, Table 3 of the Water Monitoring Plan (Appendix H), as specified below. The zone above the Dissolution Surface shall be monitored weekly for water level, temperature, and specific conductivity. The Director also may require quarterly monitoring of the zone above the Dissolution Surface for constituents provided in the water quality short list, Table 2 of the Water Monitoring Plan (Appendix H) if determined necessary by baseline monitoring results. (b) Location: The monitoring program shall include a series of wells designed to monitor alluvial and bedrock water bearing zones. Each monitoring well shall have an approximately twenty (20) foot sample interval centered across the monitored zone or zones. Wells will be located in four settings with respect to the site or the well Page 18 of 120 EPA FINAL Area Permit No. C03870-00000