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r ~ ~ The sampling pit should be covered to prevent contamination. The follo:rzng ~~ Yy stipulation is hereby attached to this permit approva': ~~ ~ ERR COAL IS DIRECTED TO 510NITOR WATER QUALITY FRCbf TY.E SPRING AT THE OLD SUDDGT.Y :4IiJE QUARTERLY FOR CNE YEAR, ACCORDI:7G TO THE SAME PARAd1ETERS n5 OTHER HYDROLOGIC ~~ ^fONITORING. RESULTS ARE TO 9E SUBFfITTED TO THIS DIVISION. VII. .assessment of Probable Cumulative Impacts (2.05.6(3)1 Surface Water This acessssment is based upon the applicant's statement of probable hydrologic consequences which has been summarized for inclusion in this assessment, and the hydrologic and geologic information contained in the Kerr application. Ail of the effects identified are assumed to be short-termed. However, the applicant is undertaking a continuing surface and groundwater monitoring program to verify the analysis of probable hydrologic effects. Future reviews will reassess the cumulative hydrologic effects in this area using improved techniques, additional baseline data, new research, and the results of surface and ground :rater monitor- ing programs. .an ticioated coal mining in the general area included the existine and proposed Kerr surface mining operations, and the existing Wyoming Fuels mine. Additional mining assumes that :/yoming Fuels would acuire Leases to mine additional coal in Section 10, TBJJ, P.iBW, and that Kerr's mining activities would continue along cite other limb of the Johnnu Moore sunline. This scena r_o involves the disturbance of d46 acres in Bolton Draw, 71 acres in 3ush Draw, 200 acres in Williams Draw, and 50 acres in Sudduth Draw. Calculations assune :coral case conditions, the drainaces are analyzed as if al _' the proposed disturbances :could occur simultaneously. Under actual conditions, mining would be phased. As a result, tre actual effects should be Less. Effects T.io of the expected hydrologic effects are not quantifiable at present. Surface water monitoring at the Kerr mine siteindicates that the ion balance in tl:e surface .caters would shift to a sodium-bicarbonate and magnesium-sulfate type water. :,later chemistry should return to natural conditions following reclamation. This effect would be most persistentin Bolton Draw which receives most of the rruninq actin;ides. In Sudduth Draw which would have the Zeast disturbance the change :~cuZd crobably be undetectable . The e_'facts of releasing sediment de*"'cient :raters from sedi.nent ponds :could trcbably not have an additive effect on the receiving streams. Under ephemeral rec'mes the crater released would ouicklu infiltrate charnel alluvium,and any dorm cutting :could be limited to the point of discharge and immediately downstream. Unless Zarge amountsof pit water are discharged through sediment ponds, and the spot effects are left unmitigated, tr:e receiving streams should not be af_'ected. Other surface :cater effects are quantifiable. Under the proposed scenario, Bolton Dracr sur_'sce flow (ann vaZ yiel dl would be reduced by 2ND because of pond detention :::ring the mining phase of the operations. Following successful reclamation, surface flows would be increased by 6a of the annual yield. During operations, salt Ioad:ng ;could occur at a rate o` 90.5 Y.q/ur. In gush Uraw, sediment pond detention would be 7°a of the annual wield, the post- -G-