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Mine Bench.5 All of the equipment and facilities to be used will be located in this area. The <br />equipment and facilities used for this experiment will be temporary and will be removed at the <br />conclusion of the high-temperature test. <br />Drilling: The drilling operations associated with these tests are routine for the mining industry <br />and similar to those already undertaken as part of the low-temperature test conducted under TR- <br />11. The drilling units employed will be electrically or pneumatically powered using a power <br />source located outside of the mine workings. <br />Fluid/Gas Handling Facilities: Temporary fluid handling facilities will be installed on-site <br />during the conduct of the test. The purpose of these facilities will be to collect, sample, and <br />dispose of any generated oil and gas. Produced oil and any coproduced water will be separated <br />from produced gas and accumulated in a tank and sampled. After sampling, fluids will be <br />trucked off site for further analysis or disposal. ExxonMobil estimates that 1-2 truck loads of oil <br />and associated water will be sent off site during each week of testing. <br />ExxonMobil will incinerate any produced hydrocarbon gases with a flare commonly used at <br />conventional oil and gas production facilities. <br />All of the fluids and gas handling facilities will be temporary. ExxonMobil expects that, with the <br />exception of the flare, the facilities will be either truck- or skid-mounted. The equipment will be <br />stationed on the Mine Bench. <br />Water Use/Discharge: This experiment involves the use of small amounts of water, primarily to <br />facilitate the drilling of shallow production wells and boreholes. ExxonMobil will use on-site <br />surface water for this purpose through the exercise of its existing water rights. Based upon its <br />prior drilling experience at the site, ExxonMobil does not anticipate the need to use chemical <br />additives that would prevent the return of the drilling fluid to the mine outflow. Residual drilling <br />water will enter the existing mine outflow that discharges to the Mine Bench. No additional <br />discharges of water beyond the existing surface water and storm runoff are anticipated. If the <br />need arises to use chemical drilling additives that cannot be returned to the mine outflow, drilling <br />water will be retained in temporary tanks on the Mine Bench. Retained water will be disposed of <br />off-site. <br />Borehole/well abandonment: ExxonMobil plans to drill one additional ground water monitoring <br />well and at least four production wells in connection with the high-temperature experiment <br />described above. ExxonMobil may also drill additional observation holes to gather data in <br />connection with the experiment. Abandonment plans and related cost estimates for the <br />additional groundwater monitoring well, production wells, and observation boreholes will be <br />substantially similar to the abandonment plans submitted to DRMS with ExxonMobil's June 6, <br />2008 letter from R. M. Smith to Steve S. Shuey in connection with DRMS's approval of TR-11. <br />ExxonMobil will abandon the wells by cementing the full length of each well. After cementing, <br />5 Under one scenario, production wells could be drilled from an existing road bench <br />directly above the mine. <br />10 <br />#1445022 v1 den