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ExxonMobil <br />Global Services Company <br />Colony Shale Oil Project <br />P.O. Box 2567 <br />Houston, Texas 77252-2567 <br />May 10, 2011 <br />??? SAS <br />IRECEIV <br />MAY202Oil <br />Di,;. rn of Knclarnation, <br />Mining and Safety <br />E-zzonMobil <br />RECEIVED / <br />MAY 1 1 2011 <br />Colorado Division of Reclamation Mining & Safety <br />Grand Junction Office <br />101 South 3rd Street, Suite 301 <br />Grand Junction, Colorado 81501 <br />Attention: Travis Marshall <br />Re: Mined Land Reclamation Board Per it No <br />In Situ Tracer Test with SF6 <br />Dear Mr. Marshall: <br />GRAND JUNCTION FIELD OFFICE <br />CLAMA IONSMIN MINING & SAFETY <br />M-1980-04 - Colony Shale Oil Project <br />ExxonMobil plans to conduct additional SF6 tracer tests at its Colony Mine site. These <br />tests will differ from previous SF6 releases on the mine bench; in these in situ tests, SF6 <br />will be injected into boreholes to help us predict where gases that may be generated in <br />future Electrofrac experiments may exit the mine walls or cliff face. These tests are <br />planned for the week of May 16, 2011. <br />During the tests, we will be injecting pure sulfur hexafluoride (SF6) into approximately six <br />boreholes near the two existing Electrofracs EF1 and EF3. Each borehole will receive a <br />90-minute SF6 injection at a flow rate of 1 scf/min. The maximum total amount of SFr to <br />be released in this series of injections is 230 lb. <br />As previously communicated to you, ExxonMobil engaged Ashworth Leininger Group to <br />evaluate air permitting requirements for a previous SF6 release of this magnitude, and <br />their conclusion was that "The proposed testing program [release of 230 lb.] does not <br />trigger any regulatory requirements of the CDPHE." Based on Ashworth Leininger <br />Group's analysis, the sum of the two 2011 SF6 tests (460 lb.) does not trigger any <br />regulatory requirements. <br />Respectfully submitted, <br />,-4? e, aSAmx-,- <br />Tom L. Adams <br />Colony Supervisor <br />ExxonMobil Global Services Co. <br />Acting for and on behalf of <br />Exxon Mobil Corporation <br />An ExxonMobil Subsidiary