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Page 3 Letter to Carol Pahlke January 2, 1981 Response: The amount of salt loading on receiving streams is tentatively estimated at revised pages 780-126ggggg and 780-126hhhhh. As stated on these pages, sufficient data for salt loading studies should be available in the annual hydrologic monitoring re- port in 1982. Revised Pages: Revised pages 780-126ggggg and 780- 126hhhhh have been attached hereto. 3. The applicant should provide additional information concerning the expected change in ion balance (#7, Nov. 7, 1980 memo). Is a sodium-bicarbonate and magnesium-sulfate type water more or less suitable than the baseline water quality for stock watering or for irrigation? Explain the basis for the conclusion. The applicant has referenced Skogerboe, et. al., 1979 as the ba- sis for the prediction that the change would be long-term. The applicant should demonstrate the similarity of the two areas (geology, hydrology, processes causing the chemical change) to justify extrapolating the study to the Kerr Site. The referenced report seems to consider runoff primarily from untopsoiled spoil. What effects, if any, would reclama- tion under the current standards have? In addition, the refer- enced study indicates an increase of certain trace metals (such as Mn and Se) in streamflow. What trace metal increases would be expected at the Kerr site? What are the consequences of any increase? Response: As requested, additional information con- cerning the expected change in ion balance is provided at revised pages 780-126iiiii and 780-126jjjjj. Revised Pages: Revised pages 780-126iiiii and 780-126- jjjjj have been attached hereto. C. December 23, 1980 letter from MLR to Kerr Coal. 1. Page 816-15a was not received by the Division in response to concerns over statistical formulae. Response: It is assumed that the page referred to in this concern is 816-156a. Kerr coal has enclosed copies of revised pages 816-156a and 816-156b reflect- ing certain statistical formulae.