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I I I I I I I I I II II II II I ~ II I J I SECTION 4 WATER TREAT~NT FACILITIES Description of Existing Facilities. The present water treatment facilities consist of two settling basins, chemical building, six high rate r~pid sand filters, and two clear wells. Exhibit No. 6 shows the layout of these facilities. Water enters a Parshall flume from either the 30" transmission line from the Royal Gorge or the 30" line from the pump station where the flow is recorded. The water then enters the primary settling basin and excess water bypasses the plant via a 30" line and flows into the Fruitland Irrigation Ditch. Chemicals are added to the effluent of the primary settling basin and this addition of the alum and lime is controlled by the operator by reference to a pilot filter located in the filter bUilding. The water enters the second settling basin at the west end and flows to the east. Charcoal is added midway through the second basin. Water leaves the northeast corner of the second settling basin and flows to the filters via a 48" line. Chlorine is added to the water before it enters the filters and before it enters the clearwells. A polyelectrolyte is also added to the water just prior to entering filters as a filter aid. The six rapid sand filters have a total theoretical capacity of 12 mgd, but allowing for backwash time, loss of backwash water and downtime due to other factors the actual capacity of the filters on a continuous basis is 10 mgd. After leaving filters water enters the clearwells which have a combined capacity of 3.5 mg. Water used to backwash the filters presently flows into the Fruitland Irrigation Ditch. Drains from the two settling basins presently tie into a drain line that runs down to the Arkansas River. Proposed Baskwash Settling Basins. As indicated previously, the water used to backwash the filters flows into the Fruitland Ditch and is used for irrigation in the summer months. During 4-1