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*. <br />~~tEP STAtFS <br />P T U <br />a <br />"rAt vROSE`~~ <br />UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br />REGION 8 <br />999 18TM STREET -SUITE 300 <br />DENVER, CO 80202-2466 <br />Phone 800-227-8917 <br />http://www.epa. gov/reg i on08 <br />PUBLIC NOTICE <br />INTENT TO ISSUE PERMIT MODIFICATION No. 9 <br />MAJOR MODIFICATION <br />ENVIRONMENTAL PROTECTION AGENCY (EPA) FINAL AREA PERMIT <br />No. C030858-00000 <br />TO <br />AMERICAN SODA, LLP. <br />PURPOSE OF PUBLIC NOTICE <br />The purpose of this notice is to solicit public comment on the proposal by the Region 8 <br />Office of the U.S. Environmental Protection Agency (EPA) to issue a Major Modification to <br />Underground Injection Control (UIC) Area Permit No. C030858-00000. The Permit is issued to <br />American Soda LLP (American Soda) for solution mining of the mineral nahcolite via multiple <br />Class III solution mining wells within the Yankee Gulch Sodium Minerals Lease located in the <br />Piceance Creek Basin in northwest Colorado. EPA is proposing several modifications to the <br />Permit that pertain to: I) revised subsidence monitoring requirements; 2) revised defmition of the <br />injection interval; 3) adding requirements for temporary suspension of injection operations; and <br />4) revised ground-water monitoring requirements. <br />The EPA has reviewed the submitted request and information, has determined that <br />underground sources of drinking water will continue to be protected, and is hereby proposing to <br />modify UIC Area Permit No. C030858-00000. For the purpose of the Permit and Modification, <br />the term "commercial scale" means the injection, circulation, recovery or production of fluids for <br />sale or for pilot testing of a new application. Additionally, the Assistant Regional Administrator, <br />Office of Partnerships and Regulatory Assistance, is the Approving Official for the Modification <br />and is referred to as the "Director"throughout. <br />BACKGROUND <br />Steigers Corporation, on behalf of American Soda, filed a request for a modification of <br />Area Permit No. C030858-00000 on September 24, 2004. Injection activities associated with <br />~'~ Printed on Recycled Paper <br />