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subsurface piping. Additionally, please include the water system on the <br />appropriate map. <br />4. On Page 2.05.3-9 Northfield states that they will bury on site any demolition <br />debris and all concrete that can not be salvaged. Please note that while the <br />burial of demolition debris does not require a certificate of designation (CD) <br />from the CDPHE, both county and landowner approvals are required. <br />Although the commencement of final reclamation is many years in the future, <br />the Division requests that Northfield include a statement in the text stating <br />that all necessary county and landowner approvals will be in place prior to <br />burying any demolition debris on the site. <br />5. On pages 2.05.3-9, 2.05.3-10, 2.05.3-11 and 2.05.3-12, Northfield discusses <br />the portal construction and use in addition to portal reclamation. The <br />approximate dimension of the portal is 28 feet wide by 25 feet high. The <br />method discussed for the sealing of the portal is discussed on Page 2.05.3- <br />12. Northfield states that the portal reclamation will include the construction <br />of a concrete block wall and sealing of the portal for at least a distance of 25 <br />feet. The Division requests that Northfield provide a diagram (or diagrams) <br />for the different sealing methods discussed. Additionally, please provide the <br />exact dimensions of the portal opening for bonding purposes. <br />6. Page 2.05,3-10 of the Northfield application is Figure 2.05.3-3 -Decline Slope <br />Profile Typical Design. The text on the left hand side of the page ("Portal and <br />Ramp Area", "Chandler Creek" and "County Road 79") is all upside down. <br />Please correct this text and resubmit Figure 2.05.3-3. <br />7. On page 2.05.3-11 Northfield discusses the use of a rail system for the <br />transportation of men, materials and supplies, extending approximately 100 <br />feet into the yard. Please provide additional information regarding this rail <br />system for bonding purposes. Please include design information including <br />use of railroad ties, ballast, footers and any additional information that is <br />necessary to calculate the reclamation cost for this structure. <br />8. Pages 2.05.3-12 and 2.05.3-13 of the Northfield application discuss the <br />ventilation shaft construction, operation, and reclamation. The reclamation of <br />the shaft is further discussed on Page 2.05.4-12. The description of the <br />sealing method appears to be adequate. The Division, however, requests <br />that the operator provide a detailed figure showing the reclamation of the <br />ventilation shaft, including the reclamation of the collar, filling of the shaft and <br />the placement and dimensions of the vent-pipe. <br />9. There is a typographical error on the third line of the second paragraph on <br />Page 2.05.3-13. The word "feet" should be changed to "foot". Please make <br />the necessary change and resubmit the page. <br />