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Mr. Dan N,athews <br />January 4, 1983 <br />Page 3 <br />• 2. II mlXing 15 not aCCeDtable and SLrr1C L°nt. tlme allows, <br />additional sam~l=_s vill be lyzed to determin=_ the extent or the <br />ana <br />S L'SDeCt ma teLlal. If the mater lal is Ce termined t0 be lOCallzed, One <br />acre Or less OV2I One Seam, n0 adC'_t1CLa1 measures wlll be undertaken. <br />3. If mixing is not acceptable and time does not allow for <br />additional analyses, or additional analyses shows greater than one <br />acre of unacceptable material, the material will.-be hauled to a lower _- <br />durru to ensure that the material will not be. placed in the rooting <br />zone of the regraded spoil. <br />4. If suspect material is encountered on the regraded spoil, <br />additional sampling will be conducted to determine the extent of the <br />suspect material. If the area is greater than one acre, it will be <br />covered with at least five feet of acceptable material. Also, if this <br />situation is detected, Colowyo will further evaluate the suspect material <br />with respect to the plant species included in the reclamation plan, <br />to determine if a potential toxicity actually exists. Also, it could <br />be appropria*e to plant only resistant species in the area if it is <br />relatively small. <br />I trust that the above information will provide sufficient <br />clarity to Colowyo's overburden sampling program. Colowyo is pleased <br />• to work with the Division to further advance our ability to characterize <br />overburden materials: Zf this program continues to show (as have past <br />overburden analyses and current reclamation success) that the Williams <br />Fork Formation in this area does not pose any problems for mined land <br />reclamation, Colowyo will request a revision to or cessation of this <br />program. <br />If you have 'any questions, please contact me_ <br />Sincerely, <br />j~ <br />R. G: Atkinson <br />Chief Reclamation Engineer <br />bcc: L. B. Gray <br />• <br />