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Figure 5. Ground and surface water monitoring stations. <br />The risk of adverse impacts to ground or surface water associated with a high-temperature test is <br />low. The Mahogany zone acts as an aquitard, and water that does enter it has extremely low <br />mobility. The experimental work completed to date has shown that colored fracturing fluids <br />remain in the Mahogany zone; such fluids have been observed in holes drilled many months <br />later. Hence, the risk that contaminants may leach out of the pyrolysis zone into ground or <br />surface water is extremely low. In any event, ExxonMobil intends to install an additional <br />monitoring well into the B-groove aquifer to assess groundwater quality directly below the <br />pyrolysis zone. In addition, the channelized water that currently flows along the mine floor to <br />the Mine Bench will be enclosed in a pipe. <br />OPERATIONAL CONSIDERATIONS <br />The high-temperature ElectrofracTM testing described above is on a small scale and of limited <br />duration. The associated operational considerations will be minimal and are enumerated below. <br />Land Disturbance: The work conducted pursuant to this Technical Revision will not increase the <br />acreage of affected lands under Permit No. M-1980-047. Activity will be focused around the <br />two entrances to the commercial mine and will be confined to a relatively small portion of the <br />9 <br />#1445022 v1 den