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South <br />A pit North <br /> Possible leachate <br /> spillpoint during wet <br />Clay-liner periods to topsand and <br /> Ennis Draw alluvium <br /> (premining pz. surface <br /> was determined during <br />•sr,:',v_.._.•::.•....:•:•.... major drought) <br />r . . <br />Laramie sandstone, .1 r ^ <br />siltstone shale, <br />Premining <br />n <br /> <br />-? pi <br />e etric -? <br />rf <br />00 • '' <br /> su <br />ace <br />of coal <br /> <br />`-? <br /> ON rated, sp oil . <br /> . <br /> <br />Possible leachate <br />migration to Ennis Draw <br />alluvium via coal seam <br />Monitoring well DH96 <br />(slotted in alluvium) <br />Ennis Draw <br />_R .. ..topsan <br />Ground water and <br />leachate flow direction <br />E Topsand (is above ground <br />water) <br />Figure 1- Schematic cross-section through A pit showing two possible <br />flow pathways of ground water and leachate from backfilled pit to alluvium <br />in Ennis Draw. No scale intended. <br />ti"• Alluvium, saturated with ground <br />ti <br />ti <br />= <br />• water (and/or possibly leachate <br /> in future) <br /> Alluvium <br />j Spoil backfill, saturated <br /> with leachate <br />Spoil backfill <br />Osm Laramie coal seam, <br /> saturated with <br /> I-Ph.to <br />. Laramie coal seam <br />T. Kaldenbach, N05