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. . 041 :) Twin Lakes is now used quite heavily by fishermen. The'Forest Service estimates that fishermen and recreation use will increase from 100,000 visits annually without the Project to about 1,003,000 vists annually at Twin Lakes with the Project. 4. pit toilets adequate to disposal is Sewage Facilities.--We are quite concerned that the and disposal field systems used by private interests prevent Twin Lakes being polluted. This approach to not acceptable. present are not sevlage Therefore, powerplant design includes sewage treatment facilities to accommodate sewage from powerplant en,ployees and the public visitor center. Lake County will be encouraged to take the leadership in coordi- nating the sewage disposal facility planning so one large sewage disposal facility can be constructed to serve all facilities within the Twin Lakes area, rather than several small units with each serving the various public and private interests. After Twin Lill;es is enlarged, it is anticipated that recreation areas, trailer camps, boat dumps, as well as relocated cabins and homes will be developed and will require adequate sewage dis- posal facilities. 5. Other. --Minimum air, "Iater, sound and aesthetic pollution standards will be included in the construction specifications, and the contractor will'be required to take every reasonable precaution to limit pollution of the construction area. For example, woody vegetation that must be cleared will be disposed of by marketing the timber and chipping the slash and brush for mulch materiai. Burning will not be allowed, Mufflers will be required on all equipment to reduce sound and prevent fires, C. Adverse environmental effects which cannot be avoided 1. During construction, the area will be scarred and aesthetically will be rough in a~pearance. However, within a few years after construc- tion is completed, the penstock trench is backfilled and revegetated, and the entire feature is landscaped, the area will be pleasing in appearance wi th minimum adverse environmental effects. 2. Effects of powerplant operation on the biological environment are not yet knO\-ffi. Some fish will be lost through the pump-back phase of operation; and, during the generating phase, water of different temperature and chemical characteristics will be introduced into Twin Lakes with unknown effects to marine biology, especially mysid shrimp. We plan to initiate a cooperative limnology study as soon as possible to determine what effect, if any, powerplant operation will have on the Twin Lakes ec,?logy. 6