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<br />• <br />I• <br />1 sampling indicate lateral variability in the local depositional environment. Based upon the cropline <br />to recovery line variability, Peabody selected (meeting, G. Wendt and S. Renner, June 22, 1987 <br />and letter G. Wendt to P. O'Connor, July 6, 1987), and CDMG approved three additional sample <br />locations to accurately delineate areas of acidic and/or sodic overburden and interburden. The <br />combined Phase I/II sampling intensity for the New Horizon 2 study area is 80 acres/hole. <br />A lithium-based drill stem joint lubricant was used at all 1987 sample sites. Holes were drilled <br />primarily with air until circulation was lost. Water injections were occasionally utilized to restore <br />circulation at Sites 881 E and 886E. <br />The core drilling and sampling methods were identical to those previously described for Phase I. <br />Overburden cuttings (chip samples) were collected exclusively with air from the combination <br />bore/core holes. The vertical sampling increment for cuttings samples was adjusted at each <br />individual location in response to the encountered geologic strata. Chip samples were collected <br />from the soil surface to the depth at which cutting circulation was hampered or lost for a particular <br />hole. Subsequently, once ground water was encountered, core samples were collected. A <br />geophysical log which included density, resistivity, and natural gamma was also completed foreach <br />hole. Once all chip samples and cores were drilled, sampled, described, and boxed, they were <br />shipped by truck to InterMountain Lab in Farmington, New Mexico. <br />Parameter Selection -Phase I <br />The Phase I analyses list for New Horizon 2 was developed after an extensive review of recent <br />literature, the Division's overburden sampling guidelines (CDMG,1982), consultation with Division <br />personnel, and previous sampling conducted at the New Horizon 1 mine area. The OIU monitoring <br />plan was submitted to the Division for approval on February 20, 1987 (letter, G. Wendt to <br />P.O'Connor). A letter of agreement on the proposed OIU baseline study for New Horizon 2 was <br />received from the Division on April 24, 1987 (letter, P. O'Connor to J.Lunan). <br />The following chemical and physical parameters were proposed to be determined for the Phase <br />I evaluation of OIU material in the New Horizon 2 study area: <br />REVISED August 2006 <br />2.04.6-17 <br />