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COLORADO DEP,aR7St1Er~7 OF PUBLIC HEALTH ,4,~D ENV/RON,4tErVT. Lt'ater Qualirv Caural Divtsfon <br />Amendment rVo. S-Rationale. Page 3, Permit No. CO-0000!32 <br />• The Elk Creek ~Ltine wtl! ezeracr coal from the D-Seam, which is known to conutut groundtvnter. The initial exploration <br />work has been completed. The pernti[ree gill decanter the D-Seam during construction ojthe inttia! mine development. <br />Fallowing canpleriat of construction, underground sumps will be installed drat wtll fimcrmn as dewntenng locations jor <br />dte undergromtd mine. T1te flow front the sumps will be routed to a single aortal!, which is the scone plivsical locatio+t as <br />thz combined discharge from the de,vateri+tg wells. This ourfnll will be identified as ourfnll 01~. !t is shown u7 amended <br />Figtve ! on page l9 of the permit <br />17te ourfnll w[!I discharge to Elk Creek, which is a nibutnry to d[e NorOt Fork of the Gunnison Rrver. Ctassificntians <br />and pertinent stm[dards jor this receivfig water are disa+ssed in section 1l1. <br />V. tYlON/TORI:VG DATA <br />Table V-1 shows water qualiry data submitted by the permittee. The values indicated for well SC-3 (located above the <br />Sanborn Creek rYline) and outjall 0!I (mine tivnter discharge from t/te Sa»bora Creek Mine) are the masimum values of <br />all data submttted. The value shown for well EC-6 (located in the Elk Creek drainage in the immediate vicinity of the <br />planned Elk Creek Mine) represents the results oja .single sample collected i+t October 1998. The last column iaciicntes <br />the water qualiry standard for comparison. <br />Table V-1 -- Monitoring Resul[s <br />Parameter Well SC-3 Otufall 011 Wet[ EC-6 WQ Standard <br />Dissolved Arsenic, mg/P 0.035 N/A <0.002 0.05 (TX) <br />• Dissolved Cadmium, mg/P N/A N/A <0.005 0.005 (IR) <br />Dissolved Iron, mg/P 26.8 0.07 <0.01 0.3 <br />Total Iron, mg/P 67.2 1.22 2.64 (IR) N/A• <br />Dissolved Manganese, mg/P N/A N/A 0.011 0.05 <br />Dissolved Mercury, mg/P N/A N/A <0.0002 0.002 <br />Dissolved Selenium, mg/P N/A N/A <0.002 0.05 (TR) <br />Dissolved Zinc, +ng/P 0.33 0.07 .0.114 5.0 (IR) <br />There is no WQ Standard jar total iron jor segment 6, however a federal technology based limitation of 3.5 mg/P <br />applies to discharges of coal mine water. <br />TR means the total recoverable fraction, as defined in the Basic Standards and Methodoloeies (or Surface 6Vater (3/.S). <br />The permittee has stared drat water qualiry to date indicates that the water qualiry front the new ourfnll 015 will be <br />similar ro that from a+rfall 01 !. <br />VI. TERMS AND CONDIT/ONS OF PERYfIT <br />A. Determination of Effluent Limitations <br />1. Effluent Limitations 6t developing suitable effluent limitntiats, the Division Hurst revie}v all applicable <br />standards and regulations and apply those wi:ich are more stringent. This review includes, but is not limited to: <br />the venter quality standard bused effhtent limitations, federal guidelines and standards (40 CFR Subd7npter N) <br />and rite Regu[ntivns for Effluent Limitations (Regtdatimt No. 62). <br /> <br />