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undisturbed area. The size and thickness of the vegetation along this ditch will reduce its ability <br /> to take on surface water flows from the Ocker irrigation activities. The permittee should mow <br /> this stretch of ground to encourage the surface water flows into the Drainage Ditch from the <br /> Ocker property. <br /> 2. Conclusion <br /> The mining and reclamation activities at the Lyster Pit have not led to any offsite damages or any <br /> damages to the prevailing hydrologic balance. The area of concern identified in the Division's <br /> inspection report has never been disturbed by the pit. The topography and hydrology conspire to <br /> naturally collect surface water in the northeast corner of Lyster property. The groundwater table, <br /> even when the dewatering pump is active across the site, is very close to the undisturbed ground <br /> surface and results in very limited water infiltration capacity. The Drainage Ditch in the area are <br /> nearly flat, preventing positive drainage. These factors lead to a natural ponding effect that leads <br /> to the accumulation of standing water identified in the Division's inspection. There is no exposed <br /> groundwater in this northeast corner of the Lyster Pit. The standing water is not caused by <br /> mining or reclamation operations. <br /> While the activities at the Lyster Pit are not the cause of standing water on the Ocker property, <br /> the permittee understands Mr. Ocker's desire to ensure maximum drainage of his fields <br /> following flood irrigation. Therefore,the permittee commits to mow the vegetation along the <br /> Drainage Ditch parallel to and just west of the Lyster/Ocker property line. This will improve <br /> runoff flow conditions for Mr. Ocker and will likely lead to a noticeable reduction in standing <br /> water. It should be noted that due to the natural hydrologic conditions of the site,there will likely <br /> always be some standing water in the northeast corner of the Lyster Pit during portions of the <br /> irrigation season. <br /> Please contact me if you have any further questions or concerns. <br /> Sincerely, <br /> Ben Langenfeld, P.E. <br /> Greg Lewicki and Associates <br /> (720) 842 5321 <br /> benl@lewicki.biz <br /> Lyster Pit NOV <br /> November 2020 2 Gny;1—'.11 and,l5sociatcs H ,i' <br />