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The estimated flow rate through the rock drain is 1.2 to 479 gallons per minute. <br />The seepage from the Fire Mountain Canal does not have a perceptible flow. <br />Therefore, even if the rock drain can only pass 1.2 gallons per minute, it is <br />adequate for the seepage from the Fire Mountain Canal. The perforated pipe in <br />the rock drain will significantly increase its flow capacity. <br />The rock drain will be wrapped in geotextile fabric. Twelve inches of common fill <br />will be placed over the rock drain so as to protect against the entrance of surface <br />water or leachate from the coal processing waste. The perforated pipe in the <br />rock drain will extend the full length of the drain except for the final 20 feet which <br />shall be a solid pipe. A screen shall be placed over the outlet of the solid pipe to <br />keep rodents out of the pipe. <br />TR -80 - 7 - 07/13 <br />