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AMERICAN <br />SHALE OIL <br />LLC <br />8 <br />October 4, 2011 <br />Dear Mr. Marshall: <br />0N CONFIDENTIAL <br />OC1 U7 Z <br />Division or reclamation, <br />Mr. Travis Marshall <br />Colorado Division of Reclamation Mining & Safety <br />101 South 3' Street, Suite 301 <br />Grand Junction, Colorado 81501 <br />RE: Proposed Monitoring to Confirm Adequate Isolation at Well TM -2 (NOI No. P -2008 — 046) <br />American Shale Oil, LLC (AMSO) is requesting approval from the Colorado Division of Reclamation, <br />Mining, and Safety (DRMS) to conduct downhole monitoring at Well TM -2 at AMSO's oil shale <br />research, development, and demonstration (RD &D) site in Rio Blanco County, Colorado (NOI No. P- <br />2008 -046). The purpose of the monitoring is to confirm that Halliburton's rating of "fair" cement to pipe <br />bond provides hydraulic isolation of the retort test interval from the overlying L3 hydrostratigraphic unit. <br />The longstring casing at Well TM -2 has been cemented in place from the casing point (2,290 feet [ft] <br />below ground surface [bgs]) to 310 ft bgs. The dissolution surface was encountered at a depth of <br />approximately 1,835 ft bgs, and the top of the retort test interval (R1 zone) was encountered at a depth of <br />approximately 1,975 ft bgs. <br />The proposed monitoring will be conducted at Well TM -2 as follows: <br />1. All water within the fully sealed well casing will be evacuated. <br />American Shale Oil, LLC <br />110 East 3' Street, Suite 201 <br />P.O. Box 1470 <br />Rifle, CO 81650 <br />Phone: 970 - 625 -4324 <br />Fax: 970 - 625 -4318 <br />RECEIVED <br />OCT 0 4 2011 <br />GRAND JUNCTION I-ICLu OFFICE <br />DIVISION OF <br />►u1A ZION MINING & SAFETY <br />2. A downhole casing cutter will be used to cut a 360 °, 1- to 2 -inch wide opening in the casing at the <br />top of the retort test interval (1,975 ft bgs); a point at which the Halliburton cement log evaluation <br />indicates "fair" cement to pipe bond. <br />3. A downhole video camera will be used to monitor the opening for water inflows to the well; <br />monitoring will continue as long as necessary to demonstrate isolation or lack of isolation of the <br />retort test interval <br />4. Short-term, limited, or no seepage into the well will indicate adequate isolation of the retort test <br />interval. <br />5. Continuous seepage into to the well will indicate lack of isolation of the retort test interval; if <br />necessary, a sample of the water seeping into the well will be collected for field parameter <br />measurement (pH, specific conductance, temperature) and comparison to baseline measurements <br />for the overlying L3 hydrostratigraphic unit. <br />