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16. The dewatering plan for the BN ER will occur in two stages. Stage 1 will <br />dewater the pond volume of water to approximately 1 /3rd of the current depth. <br />This will occur on the north end adjacent to the river. A portable electric <br />submersible pump will be used to dewater with a capacity to lift 15ft at 800 <br />gpm. Once the pond is drawn down to 1/3 rd the depth, a backhoe will be <br />used to dig a sump . Once the sediment has settled, the sump will be pumped <br />to the point where the water level is below the pit bottom. After the pit bottom <br />is allowed to dry out, an excavator will dig a ring ditch surrounding the toe of <br />slope to implement Stage 2 of dewatering, which will be to continuously pump <br />the sump connected to the trenches in order to keep the pit dry. <br />17. The sump described above will act as a sediment pond and will be reclaimed <br />following construction of the clay liner. <br />18.The NPDES permit has been enclosed as Attachment V <br />19. The well permit has been enclosed as Attachment VI <br />20. Evidence of the historic Larimer County USR has been enclosed as <br />Attachment VII <br />In conclusion, it is requested that the Decision date for the Brownwood Pit (M-1979- <br />059) (AM -03) be extended to October 31, 2015 for the purpose of giving the Division <br />time to review the adequacy review items as well as for the applicant to revise the <br />SWSP to include the Pfeiff addition and dedicate addition water if needed. <br />pe vo4cu"'i <br />Peter Wayland <br />President <br />Encl. Attachments I -VII, Revised Exhibit F <br />S1 Wailand, Inc. <br />Environmental Fr Engineering