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<br />>; " <br /> <br />'. <br /> <br />f-t. <br />r-" <br />o <br />tv <br /> <br />__ ,'~ "Of <br /> <br />area and determined that groundwater chemistry available for the study area does not <br />definitively reflect the faulting patterns presented in Amoco's report. The general <br />relationships present in the hydrochemistry show anomalously low TDS values roughly <br />. parallel to the river valley extending from the outcrop area approximately .Smiles <br />basinward.Some local variability is present, but the low TDS "plume" transgresses <br />almost all faults interpreted in Amoco's report. The existence of this plume supports <br />the permeability streak determined by the .reservoir simulation. <br /> <br />The reservoir simulation performed by ARI for the investigative team (Appendix B) <br />shows that production from down-dip wells is causing depressurization and seepage <br />of methane at the outcrop. The simulation did not utilize aRY fault control and honored <br />the material ~alance ofthEi Fruitland Formation fluids. The model also incorporated an <br />outcrop recharge component to simulate precipitation infiltration. <br /> <br />An important result of the team's engineering and simulation .report is the graph of <br />projected gas discharge at the outcrop presented as Figure 34 of the ARI report <br />, . <br /> <br />(Appendix B), The base case shows increased gas production at the outcrop thrdugh <br />1998 if coal-Qed methane wells remain producing. The second. case shows the effect <br />at the outcrop when the gas wells in the study area are shut-in. The "shut-in" oase <br />clearly shows a dramatic decline in gas discharge from the outcrop within a few years <br />of the wells shut-in, and dramatic reduction of seepage in four to five years. The thi.rd <br />and fourth cases indicate the rate of seepage is rapidly and dramatically reduced when <br />water is injected into the Fruitland Coals. <br /> <br />-., <br />:; <br /> <br />:j. <br />] <br />"j <br /> <br />The Safety Subcommittee in conjunction with Amoco tested several homes and. <br />domestic water wells in the Pine River Ranch area. One home had a flammable level <br />of methane along the edge of the slab foundation and methane venting from the ground <br />has been ignited just west of the Pine River. Also, the Groundwater Monitoring Report <br />contained in Appendix F documents high concentrations of methane in several water <br />wells in the study area. <br /> <br />J <br />,oj <br />- ~! <br />7i <br />1 <br />,: <br />;il <br />1 <br />1 <br />~l <br />.w <br />;j <br /> <br /> <br />'t <br />-~ <br />1 <br /> <br />.1, <br /> <br />_-.~id ~.-" ' <br /> <br />"IJ,.., ,;(:i,.-,.,-- <br /> <br /> <br />6 <br />