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.4.3 EXHIBIT C -Pre-minine and Minine Plan Map(sl of Affected Lands Depending on how the structural agreement issue is addressed, the mining plan map may need to be revised to more accurately delineate the proposed affected azeas. This will be discussed in more detail later in the review. In addition, for bonding purposes, the locations of the topsoil and overburden stockpiles should be identified. 6.4.4 EXHIBIT D - Minin¢ Plan With the exception of some water and structure issues that will be discussed later in this letter, the mining plan is adequate as submitted. 6.4.5 EXHIBIT E -Reclamation Plan You have indicated that backfilled slopes will be occur at either 2H:1 V or 3H:1 V, however, the reclamation plan map seems to show only 3H:1 V backfilled slopes. Please clarify what the slope angles will be for the backfilled slopes. 6.4.6 EXHIBIT F -Reclamation Plan Map Please provide more detail on the installation of the clay liner, specifically, how will the liner be tied into the shale underlying the gravel deposit. Also, since the post-mining land use will be a clay-lined reservoir, has any consideration been given to the possibility of water mounding up gradient of normal groundwater flows and their potential impacts on existing structures or regional hydrology? Please provide an explanation about this possibility and what measures have been taken to alleviate potential hydrologic impacts. 6.4.7 EXHIBIT G -Water Information There are a couple of azeas under this exhibit that will require additional information or clazification. The permit application states that the site will be dry mined, indicating that the pit will need to be de-watered in order to facilitate this method. The application narrative states that the Office of the State Engineer (SEO) will be contacted with respect to obtaining a substitute supply and augmentation plan. The review information that we received from the SEO concurs with this assessment and also states that either a gravel well or other type of well permit will also be required. If this permit and associated supply and augmentation plan aze not approved prior to the decision date for this application, we will require one of two sepazate options. The first would be to bond the site for backfilling the excavated pit to a point that is two feet above the normal static water level. Obviously this is very expensive and is probably not the first choice. The second option would be to restrict the mining excavation depth to a point that is two feet above the normal static groundwater level until such time as the substitute supply plan is approved and a well permit is issued. This would allow some preliminazy development activities to occur while the plan is being processed. Please provide some discussion about how you may