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Memo to Steve Renner <br /> Coal Basin Examination <br /> page 3 <br /> of disturbance. However, the Army Corps of Engineers has the <br /> ultimate authority in this situation through their issuance of the <br /> 404 permit. <br /> Following the completion of the channel relocation, I recommend <br /> that we require Mid-Continent to survey, photograph and map the <br /> resulting channel .reconfiguration. In addition, we should direct <br /> the operator to install sufficient monuments at the toe and crest <br /> of the incised slope to accommodate simplified determination of <br /> recession of the crest of the incised slope. <br /> Treatment of Seep Area <br /> Coincidentally, the northwestern extremity of the old coal refuse <br /> pile, which lies adjacent to and immediately west of the receding <br /> incised slope, is a boggy seep area. The area is poorly drained <br /> and several seeps issue from the slope. An area to the northwest <br /> of the refuse pile appears to have been disturbed to borrow topsoil <br /> and subsoil to cover the refuse. A small surficial failure has <br /> occurred in this area, as evidenced by several lateral extensional <br /> cracks with up to two inches of vertical offset across the cracks. <br /> This small failed area, approximately 75 feet across by 50 feet <br /> parallel to the slope gradient does not affect the refuse pile. In <br /> addition the diversion ditch upslope from this area is poorly <br /> defined and obviously incapable of containing the flow, allowing it <br /> to contribute to the bog condition at the toe of the refuse pile. <br /> Tony and I reconnoitered the immediate area. An old access road <br /> descends from the northwestern corner of the pile area to Dutch <br /> Creek. This road apparently functioned to drain the area <br /> previously as evidenced by considerable sediment clogging the road. <br /> However, the borrow activity reversed the gradient interrupting <br /> flow from the graded area onto the road. We recommend that the <br /> diversion ditch be realigned to drain onto the old access road. A <br /> small triangle of ground above the road immediately adjacent to the <br /> refuse area should be excavated and regraded to improve the <br /> alignment. This material could be used to regrade the adjacent <br /> area to grade northwest towards the road, rather than to the <br /> southeast into the boggy area. The road will require clean up to <br /> ensure containing the flow and remove the accumulated slope debris <br /> and -sediment. <br /> Tony had previously staked a relocated alignment for the existing <br /> backhoed ditch adjacent to the toe of the refuse through the bog <br /> area. The new alignment will increase the grade slightly to <br /> encourage more positive drainage. Several small seeps exist along <br /> what appears to be the terminus of the refuse and native ground. <br /> It appears groundwater migrates from above the disturbed area out <br />