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INTEROFFICE CORRESPONDENCE <br />TO File <br />Alternative Energy <br />DATE May 28, 1985 <br />Cc <br />INDIAN SPRINGS PROJECT <br />PLUGGING AND A&ANDONMENT PROCEDURES <br />AND AQUIFER PROTECTION <br />1977, 1978 and 1980 DRILLING PROGRAMS <br />The following are notes and comments regarding the question of plugging and <br />abandonment and aquifer protection in the Indian Springs project area. <br />Laramie-Fox Hills Aquifer in the Indian Springs Area <br />In her letter of February 23, 1982 to Mr. Kenneth Holmes of Mobil., <br />Linda Walker With the Colorado MLRD expressed concern that in our <br />drilling programs, we had penetrated the Laramie-Fox dills aquifer, <br />an aquifer found at the base of the Laramie formation and top of the <br />Fox Sills formation. Her concern was that in doing so, we estab- <br />lished the potential for possible contaminants found in the Laramie <br />Formation to enter the aquifer, <br />- Mobil's stratigraphic determinations of the Indian Springs property <br />place the principal target sand, the R sand, near the base of the <br />Laramie formation. A secondary sand of possible interest, the K <br />sand, was placed at the top of the Fox Hills Formations. Other sands <br />in the interval are the J&L sands. Thus based on stratigraphic <br />nomenclature, it appears that the target interval in our drilling is <br />startigraphically equivalent to the Laramie-Fox Hills aquifer. <br />- Several Items point to the Laramie-Pox Hills aquifer interval as <br />having a low potential as an aquifer in Mobil's Indian Springs <br />project. The first of these are the general lithologic descriptions <br />supplied by Michael. Rice of hobil to Linda Walker in connection with <br />the 1980 Indian Springs abandonment report (attached Fig. I). lit <br />these descriptions. the basal Laramie and upper Fox Hills Formations <br />were described as silty sandstone and a?lts one w11th mudstone. In <br />addition, in his 1980 report on the Indian Springs property, 1. L. <br />Potucek (attached Fig. 2) describes the 3&K sands in the interval as <br />being muddy sandy siltstone rather than sandstone. The Iithology of <br />the L&M sands is not described; however, their character on the <br />example log in Hickey's 1977 report (Fig. 2) Attached Fig. 3 suggests <br />that they are similarly rich in clay content, with the M sand perhaps