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• Addendum to Rational for Approval Recommendation Application for Stone Gravel Pit Permit No. M-97-089 Page 3 3. The water problems a/so include app/icani's statement that, Natural slopes are general/y west to east, beginning with the first eight mining units sloping io the east-southeast, and the remainder of the units sloping to the east-northeast, "..., whi/e providing rec/amation plans that c/aim "a gently undulating surface with a slight varying /1 to 3%/ gradient to the west will result from the finished operation. "...Review of the application fi/e /eaves a reader utter/y unable io determine the direction and rate of slope of all reclaimed lands with any reliability. App//cant's stated reason for failing to generate t/etailed ground contours"is the prohibitive cost and environmental disruption involved. ° Although not specific to the issue of the Technical Revision, DMG's response to this comment will explain what the plan indicates and why DMG believes the issues have been adequately addressed. Contour lines on Exhibit C, Mining Map, indicate that surface drainage will generally flow to the east and that a small rise occurs at or near Unit VIII. The small rise at or near Unit VIII, extends through the permit area from the southwest to the northeast and creates a minor drainage divide for precipitation which may occur within the permit area. Precipitation occurring on the north side of the small rise (Units VIII - XVI) reports directly to an un-named intermittent drainage channel which trends east-northeast through the permit area. Reconstruction of the portion of the un-named intermittent drainage channel located within the permit area and affected by mining operations was the subject of the Technical Revision. Precipitation occurring on the south side of the small rise (Units I -VIII) may initially drain to the east-southeast but quickly join the same un-named intermittent drainage channel just beyond the east boundary of the permit area. Surface drainage from the proposed permit area and surrounding areas eventually report to Mud Creek through a series of un-named intermittent drainage channels. Information within the Mine and Reclamation Plans indicate that the small rise, located at or near Unit VIII, will be removed by mining activities. Backfilling and grading of excavated areas will result in overall slope gradients of 1 % to 3%, east aspect. Overall slope gradients of 1 % to 3% with east aspect, include the 3H:1 V backfilled highwall. Applicant's statement indicating that reclamation will result in 1 % to 3% gradient to the west is describing a positive slope gradient. Positive gradients are utilized to describe uphill slopes. Negative gradients are utilized to describe downhill slopes. The same 3% slope may be described as a 3% gradient to the west (observer is facing west and uphill) or -3% gradient to the east (observer is facing east and downhill), depending upon perspective and/or direction of travel.