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STATE OF COLORADO <br />Roy Rome[, Governor <br />Patti Shwavdet, Attinp Evecuuve Duecto: <br />Gsdicated [o oro[e_[in,; and imorovmS lire neater, anc ernvronmenl of the people of Colorado <br />x300 Cherryry- Creel: D:. 5. <br />Dcm+er. Caloradc 862'_?-1530 <br />Phone (3031 692-?000 <br />Mac 30. 1995 <br />Laboracon~ Buddm~ <br />,.1G C. llth Aaenue <br />Denver Colorado 802?r-3776 <br />(3 011 641 -4 700 <br />Mr. Tom Anderson <br />Somerset Mtning Comoanc <br />P.O. Bow 535 <br />Somerset. CO SlA3y <br />pF' CO~ <br />tip, 9 <br />~~ ~~~ <br />+r~+ a <br />a` ~ <br />~ r8]6 ~ <br />Colorado Department <br />of Public Health <br />and Environment <br />R~CFlVED JUN v 5 1995 <br />Re'. Second Quarter, 1991. Whole E$luent Toxicih ("WET") Test Modification Approval <br />and I:.formatior. Rcauest for Pc.-mit A.rrendmcnt <br />CDPS Permit No.: CO-(10(1(1132 <br />Gunnison County. Colorado <br />Dear Mr..Mderson: <br />This letter confirms the approval granted be telephone on Ma}' 30, 1995, for Somerset to use the modified method <br />proposed in }'otu Ma} 12, 199, letter for Ceriodaphnia Dubia for the Second Quarter, 1995, WET test at Outfall <br />Ol 1. This approval is subject to the follotvirtg conditions: the pH is adjusted the minimum amount necessary to <br />remove the toxicity, the effluent is simultaneously analyzed for the Total Dissolved Solids components <br />demonstrated to cause the toxicity, and these results aze supplied vdth the WET test report. <br />Having reviewed the Aquatic Impairment Study and your proposed Ceriodaphnia Dubia WET testing <br />modification. the Water Quality` Control Dil~sion is prepazed to amend your permit to reflect this change in <br />method once you or yottr lab submits a step-by-step protocol describing the modified test. The amendment will <br />likely include ongoing TDS constituent monitoring in conjunction t\ith the test. <br />If you have any questions. you ma}' contact me at (303)692-3603; or Jon Kubic, who HRII draft the permit <br />amendment, at (303)692-3605. <br />Sincerel} <br />.-, i -t i <br />i _ - --'1 <br />Kadtleen L. SWlican <br />Industrial Enforcement Engineer <br />Permits and Enforcement Section <br />WATER QUALITI' CONTROL DIVISION <br />cc: Walrer L. \\'right A1me Manaeer, Somerset Dtining Co. <br />Jon Kubic, \VQCD <br />Bob McConnell. \VQCD <br />Dwam 1Vatson, \VQCD <br />915-3 Fi4 <br />