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Land Ownership: Exxon Mobil Corporation <br />General Project Description: <br />ExxonMobil Upstream Research Company ("URC"), a subsidiary of Exxon Mobil <br />Corporation, has an ongoing research program into oil shale conversion technology. <br />This process involves fracturing the oil shale rock using conventional oil well fracturing <br />techniques, injecting a proppant that will conduct electricity within the fractures, and <br />establishing an electrical current within the propped fracture which may be used to heat <br />the rock resistively. <br />Experiment Description: <br />ExxonMobil has field tested aspects of the ElectrofracTM process at the Colony Shale Oil <br />Project site. Technical Revision 11 (TR 11), approved by DRMS on October 15, 2007, <br />granted approval to drill and fracture one or more horizontal boreholes within existing <br />mine entries at the mine bench of the Colony Shale Oil Project. An update on the results <br />of the work approved by TR 11 is attached as Attachment B - entitled "Field Testing of <br />Electrofrac Process Elements at ExxonMobil's Colony Mine." <br />This Technical Revision to State of Colorado Mined Land Reclamation Board Permit <br />No. 80-47 is to request approval for mid-level temperature experiment(s), not expected to <br />exceed 300° F, in the same boreholes constructed under TR 11. As in TR 11, it is not the <br />intent of this experiment to generate oil and gas from the oil shale, and temperatures will <br />be monitored at numerous locations around the propped fracture(s). If temperature <br />sensors detect temperatures approaching 300° F, the electrical current should be shut off <br />before temperatures in the rock approach a level at which oil and gas would be generated. <br />The energy source, as in TR 11, will be a commercially available portable generator. The <br />power supplied to the fracture would be controlled to avoid the conversion of oil shale to <br />oil and gas. Success of the experiment will be judged by the survival of the <br />ElectrofracTM fracture, the uniformity of the current flow through the fracture, and the <br />uniformity of the mid-level temperature increase in the rocks around the fracture. <br />Ground and Surface Water Monitoring: <br />While the probability of any impact to ground or surface water from the experimental <br />work is extremely small, ExxonMobil has nevertheless implemented a program of water <br />monitoring to allow early detection of any impacts, should they occur. The program, <br />expanded in June 2007, is focused on the Mahogany zone at and around the location of <br />the commercial mine site. Its objectives are the early detection of any impacts to either <br />the ground water levels or to ground and surface water quality. Sampling points in this <br />program are shown in the figure included as Attachment C. <br />Currently, water levels are measured monthly in the WW-11, TH-A6, MW-12 and EF-0 1 <br />wells, and samples for chemical analysis are taken from these same wells on a monthly <br />Technical Revision Submittal <br />O