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4 <br />within the cased MAC borehole, will be used as a nitrogen injection borehole, connecting to <br />one or more manifolded pipe systems underground, which will connect to sealed gob areas. <br />At the surface, an 8-foot diameter culvert manhole may be installed around the cased MAC <br />borehole(s) as a well-head, with appropriate grounding and lightning protection to meet MSHA <br />requirements. The fixed pipeline(s) will connect at the surface to a portable skid-mounted <br />nitrogen generator. Associated equipment will include skid-mounted compressors, and <br />control equipment, which will be housed in the Fan Mechanical Building. Required power for <br />this installation will be provided by dropline from the existing substation. Installation details <br />are shown by the design drawings in Exhibit 49R.