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August 19, 1999 <br />• Cavity (roof collapse, loss of structure support in the oil shale, <br />coalescing of cavities, collapse of pillars, and fault or fracture connection <br />between cavity and aquifer) <br />• Wells (poor cement bond , corrosion and leakage) <br />• Pipelines (rupture, leaks, and operational error) <br />• Process Plant (spills, leaks, dust, and transportation accidents) <br />• Ponds (leaks, overtopping, and direct contact by wildlife) <br />This identification of potential failure mechanisms is focussed entirely on environmental <br />issues and does not address worker health and safety issues. Table 1 summarizes the risk <br />assessment, with the first column defining the potential failure mechanisms. <br />5.0 HAZARD ASSESSMENT <br />The hazard assessment is developed to address the question "what can happen ?" As <br />presented on Table 2, the potential hazards have been described in the following general <br />classifications: <br />• Subsidence of the strata above and adjacent to the cavities <br />• Groundwater contamination <br />• Soil contamination <br />• Surface water contamination <br />Each of the potential hazards has been ranked according to a five point qualitative risk <br />assessment including: <br />• Negligible <br />• Very low <br />► Low <br />• Medium <br />• High <br />• • <br />\ \GAI DENT\ PROJECTS \WP199\2057\2057TM1.DOC Golder Associates <br />MEMORANDUM <br />-3- 993 -2057 <br />Table 2 describes potential hazards and ranks them according to risk to the environment. <br />These qualitative rankings are for comparison and risk assessment purposes only. In <br />reality, the company would be expected to initiate impact avoidance measures as soon as <br />