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2. In the event that the "grout curtain" is subject to thermal fracturing and the possibility of fractures <br />caused naturally over time by natural forces, what methods of testing and monitoring will be <br />employed to detect fracturing that may degrade the effectiveness of the `grout curtain" during and <br />after any future thermal testing? <br />Response: ExxonMobil's thermal - geomechanical modeling indicates that the proposed grout curtain <br />position is at a sufficient distance from the Electrofrac that it will not be subject to any thermal <br />fracturing associated with a potential high- temperature Electrofrac experiment. Indeed, this has <br />been a design criterion for the placement of the grout curtain. <br />ExxonMobil intends to monitor for leakage during and after a potential high- temperature Electrofrac <br />experiment. If ExxonMobil elects to conduct such an experiment, our proposal to DRMS will <br />include a detailed ground water monitoring and response plan. The monitoring plan will include the <br />aquifer section directly below ExxonMobil's Electrofracs, within a few hundred feet of the <br />experiment. <br />3. Please specify at what depth below EF1 and EF3 the proposed grout curtain will be constructed. <br />Response: ExxonMobil's current intent is that grout curtain will be constructed underneath EF1. <br />The basin -like shape of the grout curtain indicates that it will not be at a constant depth. At its <br />deepest point directly below the middle of EF1, the grout curtain will be approximately 50 feet below <br />the mine bench level. This places it 25 feet above the underlying aquifer it is intended to protect. If <br />the grout curtain were instead to be built underneath EF3, it would be placed at a similar depth. <br />We appreciate your assistance with this matter. Should you have general questions about this response, <br />please contact me at 281 - 654 -6246. Technical questions may be addressed to Mark Del Pico at 713- <br />431 -7581 or mark.delpico(a�exxonmobil.com. <br />Respectfully submitted, <br />Tom L. Adams <br />Colony Supervisor <br />ExxonMobil Global Services Company <br />Acting for and on behalf of <br />Exxon Mobil Corporation <br />