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<br /> <br />acid forming. <br />A four inch steel pipe (schedule 10 or stronger) will be placed in <br />the #1 slope portal seal and extended to the reclaimed surface. <br />This will allow discharging the water if the water level surface of <br />the water in the mine builds up to a level which exceeds the <br />elevation of the end of the pipe. Water samples will be obtained <br />an a annual basis in July if water is being discharged from the <br />mine. The water will be analyzed for the chemical parameters <br />listed in the "Hydrology - Monitoring Program" section. <br />Water discharged from the sediment ponds into the Harvey Gap <br />Drainage will be sampled and analyzed on a quarterly basis as per <br />the existing NPDES Permit. <br />The four inch pipe will have a one-half inch plastic pipe installed <br />in it. This pipe will be used to determine the level of the water <br />which surrounds the pipe. The four inch pipe will have a valved <br />vent installed to allow the level in the four inch pipe to equalize <br />with the water outside the pipe. <br />The level of the water will be determined by pressurizing the one- <br />half inch pipe with air which will force the water out the bottom <br />of the pipe. When all the water is forced out of the bottom of the <br />• pipe the pressure in the one-half inch pipe will stabilize. <br />Sy measuring the pressure and knowing the elevation at the bottom <br />end of the one-half inch pipe the level of the water can be <br />computed by adding the feet of water displaced (pressure) to the <br />elevation of the lower end of the pipe. The elevation of the end <br />of the pipe will be stamped on a brass tag attached to the pipe. <br />The elevation of the top end of the four inch pipe will be stamped <br />on the top of the four inch pipe. <br />Water level measurements will be performed on a monthly basis. <br />Post-it" Fax Note 7g7t Dade ~ <br />Iti <br />• <br />lOlA Technical Revision 11 2/14/95 <br />