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ARCOSA <br /> filled these ponds and has remained since, due to the low permeability of the Pierre <br /> Shale which constitutes the quarry bottom and majority of the quarry slopes. The depth <br /> of water within the Hogan pond is estimated to be 20 feet, however the actual total depth <br /> has not been confirmed. <br /> Exhibit D and Exhibit G have been updated to clarify the use of water from the Hogan <br /> Pond and the temporary ponds during facility operations and processing. The updated <br /> Exhibit D is provided in Attachment 4 and the updated Exhibit G is provided in <br /> Attachment 5. <br /> The water rights review is described above and provided in Attachment 5. A study of <br /> Arcosa's water demands and the availability of stored water on site concluded that (i) <br /> Arcosa has enough stored water and rights to the water to cover Arcosa's water demands <br /> for the next 5 years, and that the majority, if not all, of Arcosa's water demands can be <br /> met by the current water rights in place, depending on the amount of precipitation each <br /> year after the 5-year period. These demands can be met using a combination of the water <br /> currently stored in the ponds within the quarry area and the current water rights. A <br /> detailed description of(i) Arcosa's current water rights; (ii) the current physical supply <br /> (i.e., volume) of water at the site; and (iii) recommendations to update Arcosa's water <br /> rights, based on a historical study of rainfall and current water rights, are provided with <br /> the updated Exhibit G,which is provided in Attachment 5. <br /> It is noted that the current anticipated mine life of 18 years, as indicated in the updated <br /> Exhibit D provided in Attachment 4, will require Arcosa to obtain additional water <br /> rights or implement an augmentation plan to cover water needs during dry years. As <br /> mentioned above, these additional rights or the augmentation plan would be needed after <br /> the current water supply in temporary storage ponds within the quarry area, which is <br /> expected to last for up to 5 years, is exhausted. These recommendations are described in <br /> the third-party review of water rights. As such, Arcosa plans to submit an augmentation <br /> plan for approval by a Water Court. <br /> 3. As shown on the updated Exhibit F drawings, provided in Attachment 7, and as <br /> described in the updated Exhibit E, provided in Attachment 7, the post-reclamation <br /> Hogan Pond will be 10 acres, is sized according to the Hogan's water rights, and surface <br /> water run-on to the quarry area will be diverted using swales and ditches. If the Hogan <br /> Pond accumulates additional water during post-reclamation, the Land Owner will be <br /> required to comply with their water rights, if needed. Those water rights are described in <br /> the updated Exhibit G, provided in Attachment 5. <br /> 4. Arcosa currently maintains one CDPS permits. COG501573. When discharges from the <br /> facility are required under the current water rights, Arcosa adheres to the permit <br /> requirements. Currently, if a discharge is to occur, Arcosa utilizes a pump to remove the <br /> water from the quarry ponds. Additional details related water quality monitoring during <br /> discharges are provided in Exhibit G. <br />