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<br />-2- <br />full extent of possible hydrologic effects has not been <br />defined. Until those hydrologic effects ate better understood, <br />the Division cannot determine which effects might require <br />mitigation in terms of alternative water supply. <br />3) The applicant has provided the information requested <br />concerning irrigation ditches along Fish Creek and <br />Foidel Creek. <br />VII. Protection of the Hvdroloaic Balance <br />1) This item made two requests of the applicant, that the <br />discussion of probable hydrologic consequences be <br />quantified, and that analysis be provided for specific <br />additional concerns (items 2-5). The applicant has <br />responded by providing a quantitative analysis of <br />those items specifically requested. The applicant has <br />not quantified those surface water effects identified <br />in the original discussion of probable hydrologic <br />consequences. For some of those surface water <br />effects, quantification may not be possible or <br />appropriate. However, given the Division's concerns <br />about salt loading in the area, the increase in total <br />dissolved solids in runoff from the permit area (p. <br />2.05-55), and its effect upon receiving streams needs <br />to be quantified. (This applies to sources other than <br />the discharge of mine water from underground <br />workings.) Quantification of this effect should be <br />possible using the results of the applicants surface <br />water and NPDES monitoring. <br />(Sandy, you should check with Roy to see if he is <br />satisfied with the quantification of ground water <br />effects.) <br />2) Item two made several requests concerning the effect <br />of the discharge of water from underground workings to <br />the Foidel Creek stream/alluvial aquifer system. The <br />applicant was requested to provide a worst case <br />estimate of the quantity and quality of this <br />discharge. The applicant has identified a worst case <br />discharge of 650 gpm having a total dissolved solids <br />concentration of 800 mg/1. Although total dissolved <br />solids is an important indicator of overall water <br />quality, it does not, by itself, fully describe the <br />quality of the discharge. The applicant should <br />provide a full suite chemistry of the anticipated <br />discharge. This could be obtained from the discharge <br />records of nearby underground mines. The applicant <br />should also provide documentation for the selection of <br />