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<br /> <br />179,250 gallons of liquid plus solids. At the maximum flow rate of <br />• 620 gpm, the retention time is calculated to be 4.8 hours. Solids <br />buildup is at the rate of 0.076 TPD. <br />*Earthen Pond Wo. 3 <br />The overflow from Pond tdo. 2 flows to Pond IJo. 3. This earthen <br />pond is 120 ft. long x 110 ft. wide x 6 ft. deep and has a volume of 79,200 <br />cu. ft. or 592,400 gallons. Retention time, at a flow rate of 620 gpm, <br />amounts to 15.9 hours. The buildup of solids is at a rate of 0.050 TPD. <br />The total retention time for the entire pond system is 34.6 hours, <br />which is considered ample for precipitating radium and for permitting <br />settling of solids. The total amount of solids settled per day is approxi- <br />mately 0.5 tons. Flow from one pond to the other is by gravity (except <br />for pumping to underground areas). The outflow or discharge from Pond <br />iJo. 3 is piped underground to Ralston Creek. The flow is by gravity. <br />• Uncontaminated Runoff Control <br />In order to safeguard the ponds from damage by excessive run-off <br />due to significant precipitation events, a concrete retaining <br />been constructed next to concrete ponds flo. 1 and 2, as shown <br />Figure U-3. This wall extends from the concrete apron near t <br />treatment plant to the end of concrete pond Wo. 1. This is a <br />drainage slope on the northwesterly side of this wall and the <br />runoff flows directly into Ralston Creek. <br />wall has <br />in <br />~e water <br />natural <br />uncontaminated <br />With the present configuration of the water treatment plan, all un- <br />contaminated runoff waters will go directly to Ralston Creek while all <br />mine water and recycled sorter water will go through the treatment plant <br />and pond system. <br />. It should be noted that since the construction of the larger <br />water impoundment system there have been no spills from any of the <br />D-14 <br />