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Ref: 8P -W -GW <br />CERTIFIED MAIL <br />RETURN RECEIPT REQUESTED <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.gov /region08 <br />2 J .,psi <br />Roger L. Day <br />American Shale Oil, LLC <br />110 E. 3rd Street, Suite 201 <br />P.O. Box 1470 <br />Rifle, Colorado 81650 <br />o *(0 <br />Rifle Citizen Telegram, Rifle <br />Rio Blanco Herald Times, Meeker <br />NON CONFIDENTIAL <br />RECEIVED <br />JAN 302012 <br />GRI O Ji.A ct:, t. , . tI-) OFFICE <br />D'PSION OF <br />RECtJ„ rc..,iri MINING 8 QTY <br />RE: Draft Major Permit Modification: Change in <br />Temperature Monitoring Requirement <br />EPA UIC Permit CO52154 -08524 <br />Rio Blanco County, Colorado <br />Dear Mr. Day: <br />The U.S. Environmental Protection Agency Region' 8 has received American Shale Oil, LLC's <br />(AMSO's) letter on November 28, 2011, requesting a modification to the permit to modify the <br />temperature monitoring requirements for the shallower portions of the injection well. <br />The EPA has reviewed the requested modification and agrees that the proposed request is <br />reasonable given the lack of, or much lower concentrations of, oil shale that exists in the portion <br />of the well bore where the monitoring change is proposed. The modification is not expected to <br />pose any additional risks to underground sources of drinking water. <br />Environmental Protection Agency regulations and procedures for issuing UIC Permit decisions <br />are found in Title 40 of the Code of Federal Regulations Part 124 (40 CFR §124). These <br />regulations and procedures require a Public Notice and the opportunity for the public to comment <br />on this proposed UIC Permit decision. <br />The public comment period will run for thirty (30) days from the latest date of publication. You <br />may call Sallena Rodriguez at (800) 227 -8917, extension 312 -6279 to obtain the exact deadline <br />for public comments. The Public Notice Announcement will be published in the following <br />publication(s): <br />