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-13- Methods that best fit a [larticular soil, slo[le, crop. and water supply. is another measure which appears to offer nossibilities for Mineral I]uality improvement. (3) Installing closed conveyance systeMS or lining ditches and canals can result in hi(Jher delivery efficiencies and, con- sequently, iMproved water qual i ty. Proper land nreparati on by gradinq and leveling also conserves water. Potential salt-phase control Measures include the careful selection of land to be irriqated and the provision of better land draina(Je. Those lands naturally hil]h in alkaline or sodic salts should be elimi... nated fron consideration in favor of soils havinq low natural salt content. The initial leachin~ of irriqated lands can be assisted by installation of subsurface draina.,e systems adequately designed for salinity coutrol. Hith installation of such a drainaQe system. the salt load over a nUMber of years may be reduced by preventing percolation to deeper soi ls ~Ii th hi gher sal t content. In order to minimize 11ater quality probleMS associated witl Project cons tructi on acti vi ti es. the Pro,;ect contract dOCUMents shoul d contai n clauses making it the responsibili tyof the contractor to comply with all apDlicable federal. state. county. and local la~IS concerning [lollution of rivers and streams. This will require the contractor to oive careful attention to Dollution problems such as disposal of sanitary ~Iastes and production of sediMent durinll construction. It is 1\n ti ci pated that Electri c f40untai nand Cactus Park Reservoirs ('lill nrovide diversified recreational opportunities. such as picnicking, caMping, fishino, swiTl1'1ino, and boating. Recreational uses expected at the reservoir are potential sources of pollution that. if not prop- erly controlled, could create local water quality problens both in the reservoir and in dOl'lrlstrean reaches of Hest Muddy and Currant Creeks. Sanitary I/aste disposal systems with no surface effluent discharl1es will be rel')uired at all recreational areas, includino the Grand lIesa recreation area. In the recreation manMement of Electric Hountain and Cactus Park Reservoirs, boatsl'lith ~/aste':holdin~ tanks or containers should be prohibited; or the tanks and containers sealed, unless fac- ilities to receive and treat the contents are provided at aopropriate locations. Provisions should also be Milde to re~uire that fuel-dis- Densino equipment on docks be provided \'lith safety features that will prevent the accidental discllarl1e of petroleum products to the reservoir. The essential features of 11aste disposal faci lities for recreational areas shoul d be submi tted to the Envi ronMental Protection AQency for revie~/ in tile early staaes of planning.