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• MS. Dan N.a th eWS January 4, 1SF3 ?age 2 F17a1v5e5 Remedial Measures As D°I will be analyzed suspect levels. Parameter bH Electrical conductivity Sodium Adsorption Ratio Selenium (if pH is greater than 8.4) Boron (if pA is greater than 8.4) Lead (if pH is less than 5 or greater than ZO) our discussion Decenber 3D, 1982, the overburden samples for the parameters listed below with the following Stspect Level le_s than 5 or greater than 9 greater than 12 millimohs/cm greater than 15 greater than 2 ppm greater than 8 ppm greater than 20 ppm • If suspect levels of the parameters to be analyzed aze encoun- tered, the Division will be notified upon receipt of the analyses and remedial measures taken. Usually, overburden drilling is ar_complished at least two weeks prior to mining and laboratory analyses can be obtained in one week, ahd possibly two to three days if requested. Therefore, if suspect levels of toxic materials are detected, the following remedial measures will be undertaken following consultation with the Division. I. An assessment of the suspect level will be conducted to determine if mixing of the suspect material with acceptable material will provide an adequate solution. Dollhopf, et. al. (2981)-found that mixing of Fort IInion Formation spoil by a dragline operation pro- vided the following results: "when the problem material constituted less than five percent of the total overburden volume, such material was essentially not detecable in the spoil pile. When the problem material constituted 5 to 158 of the overburden volume the material often could not be detected in the spoils 508 of the time; although the volume of the problem material detected in the spoils was generally less than that found in overburden, 'indicating partial dilution occurred. When problem material exceeded 15B of the overburden volume it was always found in the spoil pile, generally to a smaller extent, again indicating partial dilution." • The mixing concept will likely be more useful at Colowyo than in a dragline operation, because the enoil material may be mixed over a much larger area, both vertical an3 horizontal. If suspect ._ material is encountered, mixing c;iil be analyzed with respect to the then present dumping configuration.