1995-08-11_REVISION - M1977493 (12)

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Page I STORKE WASTE WATER PUMPING STATION OPERATING MANUAL stem Description The Storke Waste Water Pumping Station is located below and west of the Storke Level complex just south of the long curve in Highway 91 . The pumping station functions as a means of collecting ground seepage and runoff water from the Storke Level and adjoining areas and pumping this water to the Rob- inson tailings pond. Ground seepage and runoff water flows to two collection boxes which are connected to concrete flumes that transport the water to the pumping station reservoirs. The pumps send the collected water from, the reservoirs to the Robinson tailing pond. The collection system is illustrated in Fig. Surface water from the northwest areas fliows to collection box No. 2, from here it travels through an underground pipe into an open concrete flume to collection box No. I . Surface water from the areas to the south run into an open ditch and then to .collection box No. 1 . The water gathered .in collection box No. 1 flows through a concrete flume into one or both of the 329,000 gatl'ort`'each reservoirs: Note the valuing arrangement the diversion gates which makes it possible to divert water ing ponds. There are screens at the two divers- from the flumes to the Arkansas settl ion gates which must periodically be cleaned of debris. Also, there is a pipeline entering the east flume which carries drainage from the lower Storke area and mine portal discharge. Discharge from the mine will occur only at times when the mine pumps are down for maintenance. Pumping of the water from the reservoirs to thct tail-ings pond is accomplished by a level probe system that determines which pumps are to operate. The pumps are classified into systems and sets. There are .th-ree systems, six sets and twelve pumps. Fig. 2 shows the pumping systems. Each system consists of two pump sets. The two pumps in each set are in series . Each set of pumps is capable of pumping 525 gpm. A system can pump 1050 gpm. No. 1 and No. 2 systems are pri mar y while No. 3 system is backup. Water leaves the pumping station via two 8 In. diameter pipelines which can handle 1250 gpm each. During automatic operation the first system starts up and pumps 1050 gpm through the first discharge line with 200 gpm diverted back to the reservoir through the backwash orifice (7/8 In. Dia.) to agitate the solids. As the level in the reservoirs increase the second system starts up causing a hydraulic knife gate valve in the second 8 In. discharge line to open and allow water through this line.