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..._ _ _ ....,, rbao.,uu ~yrrni, u~u ,'/ COLORADO DEPAR771~N! OF Pi1BIlC AEILTfl AND ENIrIRONA~N!', Watw Qadlry Control Division Amertdrnsnr No. 3-Rationde. Page Z, Permit No. CO.0000132 P. GlllLRB Psrmit No.: C-81-022 III. RECEIVING STREAM A. Idenhftca(ion, Classlfirntion, Standards and Ant/degradaBmt - ,- - a 1. Idtntijioadon: This runpomry discharge will go to Ole North Fork of the Gunnison River, segment 3 of the North Fork of the Gunnison River Sub-basin of the Gunnison River Basin. 2. Classi ration: Segment 3 it elasshed for the following wu: Recreation, (;lass z; Aquatic Isle, Class I (mid); Agriadturt. 3. Numeric Standards: The standards which have been assigned in accordance with the above classifications can be found in the ClassijPcatlons and Numeric Stattdardt for tht Gunnison River Basin, Regulation No. 35 (S CCR 1002-35), as mnendtd Dezember 14. 1998. Iht standards subject to this review are shown in the table on the following page. The hardness -nlrte shown in the table and used to aaladare table value standards was supplied by the permittee. Thin value represeras the mean of 22 data points collected in the North Fork of the Gunnison River below the torte site over the period from June 1978 r/vough September 1998. 4. An[idetrradation: this segment it not subject to an a-itldegrndation review under provisions of sedian 31.8(2) of The Basic Standards and Methodolo¢ies for Surface Wares Regulation No. 31 (5 CCR 1002-31) betarrre the discharge is of shoe-resat Harare. IV. PURPOSE OP AMENDMENT In a lever dared April 27, 1999, rite permittee requested temporary autharizarion of a distharge point. Within the past few months, carbon monazide Ieveis to the mine ltd ro the belief char there was an underground cod fire. IJie mine was floodtd with sluts warts and then seded. Boreholes were thin drilled into the mine of key locations m monitor mrbon monoxide ltvels ro assure that the flit was out. During tht most rcutu boring, the drilling equipment came out wet. Ibis was urtapeaed because the Jlooding should nor have come up w that level. Subsequent monitoring of the water showed char tht level was mnsramty rising. The permitue fears char & soon will Jlood esptnsive underground mining equipment. For shit reason, thry have requested that they be dlowed to pump this water out and discharge it ro the North Fork of the Gunnison Rivtr. Ihry requested that this point be substrtuted for the currentty authorized mine water disrluvge point (outJlz(i 011). The authorized point is not being used because of tht sealing of the mine. They cannot tursta! the thine yet becmrse !r has not been derernrined with cenainry that the fire is out. V. ASSESSMENT OF REQUEST AND OP POTENTIAL PERMIT CAANGES The water will be pumped out of the mine using a 200 gpm pump. This pumping mre equates to 288,000 gpd. The perntinee has mnstruaed a surface sedl-wnation pond with a one acre-foot capacity (approxitmrely 326,000 gallons) outside this borehole to retain this water and acmnonodate neatmatt if necessary. This pond rent hold roughly one day's pumping. The permttree sampled the x~er and submitted the sarrrple to a laboratory for analysis. The Division requested that this analysis include all metals for which the rcuiving water has standards. The amlysls has been rccetved and reviewed by the Division. The reparibtg lbnits for andysir resubs for these metals are wo high ro directly compare ro the applicable water quality standards. however a comparison tan be made w the calculated porenrld efiTuent limitations. A summary of the standards. limitations. andyticd resalrs and related data is shown in the following tablt.