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_Zl_ <br />The coal wash plant/breaker facility will concentrate sulfide minerals <br />contained within the coals and waste rock from above, within, and below the <br />coals. This will concentrate the most acid-forming and potentially <br />toxic-forming materials. High concentrations of organic and pyritic sulfur in <br />association with high concentrations of organics (coal fines) and water in <br />slurry wastes, will increase the potential for spontaneous combustion. <br />Because of the deleterious materials which must be handled in an area of <br />ground water recharge, Pueblo Coal, Inc. has prepared detailed materials <br />handling plans for the coal wash plant/breaker facility wastes. Two areas of <br />concern were the wash plant slurry ponds and the backfill areas. (See <br />Responses to Final Adequacy Concerns received May 4, 1983). The design for <br />the two slurry ponds can be found on Figure A-4 in the text and the location <br />of the slurry ponds can be found on Map 5-1, "Disturbance and Sediment Control <br />Map" <br />The coal wash plant/breaker slurry pond will be excavated 13 feet into the <br />terrace deposit south of the pit. The ponds will be doubly lined with PVC to <br />prevent seepage of polluted processing water through the pond bottom and into <br />the terrace deposits. The company has supplied copies of the engineering <br />specifications and installation instructions for the two pond liners to be <br />used. The slurried coal processing wastes will be dewatered by a system of 4 <br />inch PVC pipes inbedded in a 1 to 2 foot gravel blanket between the pond <br />bottom and overlying the upper 30 mil. liner. One foot of gravel and a second <br />10 mil. backup liner will under lie the 30 mil. liner. An eight inch pipe <br />will be located within the underlying gravel blanket. This pipe will run the <br />length of the slurry pond and will be attached to stand pipes. These stand <br />pipes will be used to monitor leakage through the overlying liner. <br />Due to the deleterious nature of the water and the slurry wastes and due to <br />the potential for these waste materials to impact the quality of both surface <br />and ground water, the following stipulations are required: <br />Stipulation No. <br />PUEBLO COAL COMPANY SHALL SUBMIT TO THE DIVISION CERTIFICATION BY A <br />QUALIFIED PROFESSIONAL ENGINEER THAT THE SLURRY PONDS HAVE BEEN <br />CONSTRUCTED ACCORDING TO THE DESIGNS AND SPECIFICATIONS IN THE PERMIT <br />APPLICATION. THE CERTIFICATION SHALL BE SUBMITTED TO THE DIVISION WITHIN <br />ONE MONTH (30 DAYS> OF COMPLETING THE CONSTRUCTION OF THE PONDS. <br />Stipulation No. 2 <br />THE MONITORING STAND PIPES WILL BE MONITORED WEEKLY DURING THE OPERATION <br />OF THE SLURRY PONDS. IF WATER IS ENCOUNTERED WITHIN THE STAND PIPES, <br />WATER QUALITY SAMPLES SHALL BE COLLECTED AND IMMEDIATELY ANALYZED FOR ALL <br />WATER QUALITY PARAMETERS REQUIRED BY THE DIVISION. RESULTS OF WATER <br />QUALITY ANALYSES SHALL BE SENT TO THE DIVISION WITHIN 30 DAYS. RECORDS <br />OF WEEKLY MONITORING SHALL BE SUBMITTED QUARTERLY TO THE DIVISION. <br />