_GENERAL DOCUMENTS - C1981017 (260)

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-3- 3) Ground water seepage from the refuse and development rock piles and their associated sediment ponds Chemical parameters that should be addressed especially as they relate to the low flow regime are: 1 ) TDS and/or conductivity 2) Sulfates 3) Sodium Absorption Ratios (SAR) - where data is available 4) Flow - as increased by mine discharges and depleted from water uses for the mine complex Chemical parameters that should be addressed especially during high flow regimes are: 1 ) TSS 2) Iron concentration - (a trend has been identified where iron concentrations are high during spring runoff events) During review of the water quality description and Probable Hydrologic Consequences of Mining in the permit application, it was noted that no mention has been made of the potential for coal fines generation during spring runoff due to the melt of snow layered with air carried particulates emitted principally from the thermal dryers. The Division realizes that this contribution is not quantifiable but surely leads to an increase in dissolved and suspended constituents in spring runoff. A description of any impacts possible from the thermol dryers - by air carried particulates should be included in the PHC. Also, if any analyses are available of the quality or quantity of emission from the thermo dryer this should be included within the water quality description. For a comparative description of mining impacts versus the pre-mining condition, the Bear Creek sampling station can be used as baseline. In the report, the operator needs to describe the type of laboratory procedure used for metals analysis and describe the method used to sample ground water wells. Section 3 - Review of Revisions The following revisions have been noted from the Division' s files in addition to those submitted by Mid-Continent on November 43. 1985. They are numbered to allow insertion in the present numbering scheme.