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- 21 - t'\":1 n" ') '-' " lJ ~J .) " Significant water quality impacts could result from oil shale plant operation and coal mining activities, Additionally, increased population growth could cause some water quality impacts from community growth and from power plant activity. It is anticipated that with appropriate control technology these impacts can be mitigated. Water Quality - Oil Shale--Substantial impacts for oil shale plant operation could result from an increase in total dissolved solids in the Colorado River system. Total dissolved solids would be limited to specified levels at the State line. The State's policy on salinity is currently being developed, and, until that policy evolved, it is unclear what possible constraints the issue of salinity may have on oil shale development. Also, oil shale activities could affect ground water, causing significant impacts. It is felt that these impacts can probably be mitigated, but further evaluation of ground water impact is needed. Water Quality - Coal--Substantial impacts from coal ~n~ng activities, relating to total dissol~d solids, could occur. The definitive impact on stream quality, again, will depend on the State's policy on salinity. Water Quality - Oil and Gas and Uranium--Minimal to moderate water quality impact from the development of these resources is anticipated. Water Qualitv - Secondary Impacts--Substantial water quality impacts from population growth in communities and from power plant operation could occur. However, it is anticipated that with appropriate control technology the operation of power plants and municipal waste water treatment facilities would be in compliance with discharge standards. Solid Waste and Haza.rdous Materials E:valuation--A major poten.t1.:i.l problem for solid and hazardous waste disposal, associated with the development of oil shale resources, has been identified. Substantial environmental impacts for uranium mining and milling could occur with the high scenario. If appro- priate controls are applied, mitigation of the impacts to acceptable levels is anticipated. Additionally, secondary population growth could result in solid and hazardous waste disposal impacts. Again, it is anticipated that by the use of appropriate control, mitigation of the impacts to acceptable levels can be achieved. Solid Waste and Hazardous Materials Evaluation - Oil Shale--Major potential problems associated with the waste disposal of spent oil shale J could occur. In addition to the large amount of land area required for disposal (assumed to be 150 sites of 250 acres each and 100 feet deep), environmental impact on ground water due to leaching could result. Also, impacts of unknown magnitude could occur with surface water contamination, sludge formation, and from wind and soil erosion of the spent shale piles. Further review is necessary in order to determine more quantitatively these impacts and appropriate control measures needed to mitigate identified problems..