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removal of the tank from its present location foundation and placed on a foundation which is 15 feet lower. ---- Water Treatment, Water Intake Structure, and Settling Ponds: In des- cribing the physical assets of the Eagle water system, the water treat- ment facilities, water intake structure, and settling ponds were listed as separate categories. However, some of the problems experienced at the water treatment plant in filtering the turbid water out of Brush . Creek is partially due to the present design of the settling ponds. Therefore, these categories will be considered together in the plan of development. Diatomaceous-earth type filters are normally reserved for use on various water supplies having very low turbidity. Basically, the fil- ters are most efficient when operating on raw water supplies having a turbidity of 10 ppm or less.' Obviously, the nature of this turbidity also comes into play. It is impossible to go by turbidity figures alone without also defining the nature of the material in the water. Naturally, slimy solids will cause high pressure drops across the filter much quick- er than crystaline or more filterable material. Although treatment plants of this type generally produce an excellent quality of effluent, they are costly to operate and maintain. . There are several improvements that could be made to the present treatment plant to make it operate,more efficiently. One of these would be to place the chlorinator on the raw water side of the treatment plant, rather than on the finished water side of the plant. Chlorine will pre- vent the build up of slimes and algae on the diatomaceous-earth filtering tubes thereby requiring less frequent backwashes. If the residual chlorine in the treated water is not sufficient, then the dosage of chlorine on the raw water side should either be increased or provision made to inject - 45 - ,