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e , e30 Mid-Continent Resources eq <br /> Response -W.Q.C.D. <br /> GPI ' <br /> y After an on-sit consultation, and testing with a repreg'entative of the NALCO Compa y, <br /> a flocculant ( as added (Feb. 28) utilizing a drip system to the in t . <br /> Underground <br /> O I n additio"ince Feb. 25, Mid-Continent has done extensive work to reduce the <br /> sediment load generated by underground operations in the No. 1 mine. Some 824 <br /> man hours have been devoted to the effort. <br /> Figures A, B and C, attached, illustrate (Fig. A) Elevations and grades in the tunnel; <br /> the system(s) for handling of clear and turbid water (Fig. B) prior to Feb. 25; (Fig. C) <br /> and currently. <br /> The major objective of Mid-Continent's efforts underground is to reduce the sediment <br /> load to the ponds from the underground operations by: <br /> 1. reducing the volume of water which reaches the active working areas <br /> of the mine; <br /> 2. segregating the turbid (sediment-bearing water coming from the <br /> active working areas) from clear water. <br /> 3. settling out sediment from the turbid water while still in the mine. <br /> 1. Reduce water at working face. <br /> As indicated in Response #4, Mid-Continent has experienced a substantial increase in <br /> the volume of water entering the active longwall working face (#103). <br /> The greater volume of water picks up more sediment. Increased water at the face, it <br /> should be noted, has had an adverse effect on production as well. <br /> Since Feb. 25, more efficient pumps have been installed to de-water the 103 tailgate <br /> area in advance of mining. Improved de-watering of the tailgate area will reduce the <br /> amount of water seeping through the face, and also prevent water flowing from the 103 <br /> tailgate area and down the face. <br /> 2. Segregate clear from turbid water. <br /> The more efficient pump allows routing of virtually all the clear water from the 103 <br /> tailgatearea through a discharge pipe leading to the tunnel intercept discharge pipe. <br /> This is to prevent the clear water from the tailgate area picking up sediments from the <br /> mine floor. <br /> 3. In-mine treatment of turbid water. <br /> 3 <br />