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<br />r~ <br />2.05.4 (?) and 4.14 Backfilling and Grading <br />Walden Coal Company has done several surveys [o determine <br />the amount of overburden available to backfill the existing pit. <br />The latest was conducted in 1982 and it was determined, at that <br />time, [hat an estimated swell factor of 23$ was conservative. The <br />"additional area of coal" referred to by Robillard and Associates, <br />Inc. in their letter dated June 1, 198'2, was located within the <br />designated mining area and cvas not significant with regard to <br />the amount of additional overburden which will be required to <br />backfill the area. Walden Coal Company therefore stands by its <br />statement, on page F-~ of the permit, that if changes need to <br />be made to the post-mine contours when reclamation begins, at <br />the end of Stage 9, a revised plan will be submitted to the Division <br />for approval prior to implementation. <br />4.05.13 Ground Water Quality Monitoring Data <br />L~ <br />All required ground water monitoring data will be submitted <br />to the Division as it becomes available. See attached for results <br />from March 1983 through June 1985. It should be noted that most <br />of the wells have become dry since the onset of mining. As a <br />result, quarterly water quality samples have been collected from <br />wells adjacent to monitoring wells where necessary and possible. <br />There has been no evidence of water quality deterioration resulting <br />from the mining operation. <br /> <br />(3) <br />