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C~ -z- VII. Protection of the Hvdrologic Balance • 1) This item made two requests of the applicant, that the discussion of probable hydrologic consequences be quantified, and that analysis be provided for specific additional concerns (items 2-5). The applicant has responded by providing a quantitative analysis of those items specifically requested. The applicant has not quantified those surface water effects identified in the original discussion of probable hydrologic consequences. For some of those surface water effects, quantification may not be possible or appropriate. However, given the Division's concerns about salt loading in the area, the increase in total dissolved solids in runoff from the permit area (p. 2.05-55), and its effect upon receiving streams needs to be quantified. (This applies to sources other than the discharge of mine water from underground workings.)-~n~~~ „~,h~~~w.+l 4uantification of this effect should be possible using the results of the applicants surface water and NPDES monitoring. (sandy, you should check with Roy to see if he is satisfied with the quantification of ground water effects.) 2) Item two made several requests concerning the effect of the discharge of water from underground workings to the Foidel Creek stream/alluvial aquifer system. The applicant was requested to provide a worst case estimate of the quantity and quality of this discharge. The applicant has identified a worst case ~ y~ discharge of 650 gpm having a total dissolved solids ~I1~-"~ concentration of 800 mg/l. Although total dissolved solids is an important indicator of overall water quality, it does not, by itself, fully describe the quality of the discharge. The applicant should provide a full suite chemistry of the y,~-r~,~y~_a_rtot;}~~~+e~~n~~ anticipated discharge. This could be obtained from the discharge records of nearby underground mines. The applicant should also provide docun+entation for the selection of a maximum anticipated total dissolved solids concentration of 800 mg/l. The worst case discharge of 650 gpm (936,000 gpd) used for the analysis is considerably less than the projected mine inflow of 2,335,000 gpd projected for the fourth year of operation. The analysis of the effects of discharge mine water and water from the spoil well to the surface water system should be redone using worst case water quantity and quality. Although the analysis may be limited to total dissolved solids, as requested above, the applicant should identify the anticipated full suite chemistry of the spoil water and of the mine water. The applicant was requested to predict the effects of mine water ~~~5-.nc.41~~~.a~~discharge (from t mine workings and the spoil well) upon ~~~] cf5+rcn..bl-- _ surface flow regime, geomorphic stability of the stream, Cups ~~.~~Salluvial water levels, and alluvial water quality. The applicant did not address these concerns, but should do so now. G~L+~ muf2~ all~,!in~ua?F. ~¢t~p,Q,S~ J[' to ,ta-ie. ~;~'IZe sy~to,~'CI~.~ci.ixM,~ ~ a~ct.+~~ ~ ~,. ~F ~t ~~nf I~. q.i1U,~ i ul w4,'~i ~ 0