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wells screened in the Laramie Formation sandstone do not penetrate the confinement zone <br />separating the Laramie and Fox Hills Formations. <br />4. Comments related to the concern that the EPA has obtained insufficient information to <br />issue a final permit that is protective of underground sources of drinking water. There were <br />several comments requesting that EPA obtain more information before making a decision on the <br />final permit. Commenters believe that the EPA should acquire more information about: A) the <br />extent of the area within the A2 sandstone aquifer expected to be affected by the injection <br />activity, B) the water quality of the A2 sandstone aquifer and the injectate, C) the geology of the <br />injection interval confinement zones, D) the location of screened intervals in a private drinking <br />water well, which is located one mile away from the proposed injection well, relative to the <br />elevation of the injection formation, and E) the previous aquifer tests Powertech has conducted <br />at the Centennial site. Commenters questioned whether the groundwater flow was characterized <br />in the area (included in part F of this section). <br />Page 9 of 24