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<br />C crpRUs <br />~ Yampa Valley <br />December 20, 1990 <br />Mr. David Berry <br />Mined Land Reclamation Division <br />1313 Sherman St. Room 215 <br />Denver, CO 80203 <br />Dear Mr. Berry: <br />~ III IIIIIIIIIIIIIIII <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />~~ti;tlV~l~ <br />DEC 2 4 1990 <br />Mined Land <br />Reclamation Division <br />Re: Amendment to NPDES Permit CO-0027154: Permit C-81-071, <br />Mines 1. 2, and Eckman Park <br />The enclosed copies of the most recent amendment to NPDES Permit <br />CO-0027154 are being submitted for inclusion into Exhibit 4 of the <br />above-referenced permit. The primary change to our sampling <br />requirements is the substitution of Conductivity readings for the <br />TDS monitoring requirement. <br />Should you have any questions or concerns, please contact me at <br />your convenience. <br />Sincerely, <br />~~vf11~~%~~~~1~ <br />Marcus Middleton <br />Environmental Specialist <br />Enclosures <br />