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the Division will require the applicant (Hall-Irwin) to process such changes via a permitting <br />means acceptable to the Division. Please commit to submittal of a permit modification <br />acceptable to the Division if and when such changes occur. <br />6.4.4 EXHIBIT D - Minine Plan <br />4. The Division requires the applicant (Hall-Irwin) to submit a spill containment and <br />countermeasures plan in the form of a technical revision prior to disturbance at the site. The spill <br />containment and countermeasures plan must adequately describe the methods and measures that <br />will be used to contain any inadvertent spill or leak of petroleum products, antifreeze, lubricating <br />products, or hot mixes used or stored on site; and thereby minimize any adverse impacts to <br />surface and/or groundwater in the affected land and surrounding area. Please commit to <br />submittal of such a plan, in the form of a technical revision, prior to disturbance at the site. <br />6. In compliance with Rule 6.4.4(d) please clarify the volumes of topsoil and of overburden that <br />will be stockpiled at the site during the period of maximum disturbance and the locations of these <br />stockpiles. These volumes should be consistent with the volumes used in the reclamation cost <br />estimate, Exhibit L. Please respond. <br />8. Exhibit C -Mining Plan Map shows the proposed relocation of a gas line and access road <br />construction to be completed at the end of Phase 1 Mining. Please commit to providing the <br />Division with a copy of the relocation agreement for the Duke Energy petroleum line when it <br />becomes available. <br />6.4.7 EXHIBIT G -Water Information <br />14. Please provide a written response to the objectors' comments regarding possible adverse <br />impacts to groundwater quality, ie: Will there be hydrologic communication between pesticides, <br />herbicides, and nitrates in the upper portion of the soil profile in the surrounding area and the <br />groundwater surface as affected by the proposed operation at any time during the life of the <br />operation? If yes, please describe any mitigation measures that will be employed and when. <br />Please respond. <br />15 a. The applicant has provided a groundwater model which has predicted a mounding effect of <br />1 foot and a shadowing affect of 1 foot. Please verify if these predictions will remain the same <br />or will change, and to what extent, during the various seasons of the yeaz and times when the <br />groundwater flow patterns between the South Platte River and surrounding alluvium may change. <br />Please respond. <br />15b. The applicant has committed to installation of five (5) groundwater monitoring wells, <br />collection of baseline groundwater depths, and monthly monitoring of groundwater depths <br />following slurry wall installation and during the mining operation. The applicant has stated that <br />these monitoring wells will be used as an indicator to determine slurry wall failure. hi addition <br />