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Ref: 8P -W -GW <br />Ms. Michelle Thomas <br />ExxonMobil Upstream Research <br />P.O. Box 2189 <br />Houston, Texas 77252 -2189 <br />Dear Ms. Thomas: <br />UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br />REGION 8 <br />1595 Wynkoop Street <br />DENVER, CO 80202 -1129 <br />Phone 800 - 227 -8917 <br />http://www.epa.goviregion08 <br />Company <br />NOV O2Z011 <br />D 1 ° ° f Reclamation, <br />Mining and Safety <br />OCT 25 2011 <br />11:6 <br />E C ,N F <br />OCT 2 8 2011 <br />GRAND JUNL.l itiN riLL O OFFICE <br />UVIMN OF <br />RECLAMATION MINING & SAFETY <br />Re: Environmental Protection Agency <br />Underground Injection Control (UIC) <br />Rule Authorization for Tracer Test <br />Colony Mine <br />Garfield County, Colorado <br />EPA File # CO50000 -09338 <br />My staff has reviewed the proposal dated September 30, 2011, submitted by Wright Water Engineers, <br />Inc., regarding injection activities for the purpose of conducting a series of tracer tests at the above <br />referenced site. We have determined, pursuant to Title 40 Code of Federal Regulations (40 CFR), <br />§ 144.24 (as modified in part January 3, 1994), that a permit is not necessary at this time for injection at <br />this site. However, this injection activity is subject to the Rule Authorization requirements outlined in <br />40 CFR, including, but not limited to, §144.12, §144.24, and §144.27 (as modified in part January 3, <br />1994). This Rule Authorization for the Colony Mine Tracer Test Location injection wells located in <br />Garfield County, Colorado, is based on information in the proposal dated September 30, 2011, and is <br />valid for: <br />the injection of sodium bromide, sodium chloride, sodium iodide and <br />Rhodamine WT as described in the cited proposal. <br />Based on our understanding of the proposed injection activity, we have determined that this injection <br />process poses minimal potential to adversely impact ground water. For this reason, you may proceed <br />with the injection activity, and you will not be required to operate under a UIC program permit at this <br />time. <br />Any change in operating methods or conditions specified in the proposal dated September 30, 2011, <br />must be approved in advance by the EPA. If you intend to change the proposed injection procedures or <br />injectate, please notify the EPA in advance so that we may update this Rule Authorization. <br />