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THE INFORMATION ON THIS PAGE DOES NOT NEED TO BE HELD CONFIDENTIAL <br /> Exhibit C-AMSO,LLC Notice of Intent Supplemental Information <br /> • 6,J.• Describe anticipated relationship to surface water and groundwater(proximity <br /> xrmity to <br /> streams,penetration of groundwater aquifers): <br /> Surface water: <br /> The AMSO tract is located between Ryan Gulch(an ephemeral stream)and Black <br /> Sulphur Creek(a perennial stream) in the White River basin.Both streams flow <br /> northeastward about 5 miles before joining Piceance Creek. From its confluence with <br /> Ryan Gulch and Black Sulphur Creek,Piceance Creek flows northward about 10 miles <br /> before discharging into the White River west of Rio Blanco Lake. The White River is a <br /> tributary to the Green River in Utah which is a tributary to the Colorado River. The <br /> AMSO site is located approximately one mile north of Black Sulphur Creek, <br /> approximately two miles south of Ryan Gulch,and approximately six miles west of <br /> Piceance Creek. <br /> Groundwater: <br /> The groundwater system in the project area consists of an upper bedrock aquifer system, <br /> a lower bedrock aquifer system, and a confining layer that separates the two bedrock <br /> aquifers. The upper aquifer,system consists of discontinuous silty sandstones of limited <br /> lateral extent,siltstones,and marlstones of the Uinta and Green River formations. The <br /> aquifer is characterized as semi-confined due to the discontinuous nature of the <br /> sandstones. The Uinta formation is saturated below the stream levels. The wnderlying <br /> Parachute Creek Member,the topmost member of the Green River Formation,has the <br /> greatest effect on the local hydrology and water quality. Ranging in thickness from 500- <br /> 1,800 feet,the Parachute Creek Member is primarily comprised of kerogenaceous <br /> dolomitic marlstone with thin pyroclastic beds(Coffin et.al., 1971). The lower aquifer <br /> consists of the lower part of the Parachute Creek Member of the Green River formation. <br /> In general,the hydraulic conductivity of this zone is low with the exception of portions of <br /> the upper third where saline minerals have dissolved. In these areas,the.nahcolite and <br /> halite sequences have been dissolved, leaving behind a brecciated"leached zone" <br /> (Saulnier, 1978). The permeability in this leached zone is greater than in the surrounding <br /> unleached rocks. <br /> The upper and lower aquifer systems each consist of alternating sequences of more <br /> transmissive intervals separated by lower transmissive intervals. Previous studies in the <br /> basin have shown that the more transmissive intervals generally correspond with the <br /> leaner oil shale zones(referred to as"L"zones)while the less transmissive zones <br /> generally correspond with the richer oil shale zones(referred to as"R"zones). Based on <br /> regional studies conducted in the area,it is suspected that the confining layer separating <br /> the upper and lower aquifer systems corresponds with the R5 zone. Therefore,the upper <br /> aquifer consists of the water';bearing zones above the R5,namely the L5,L6,B-Groove, <br /> and A-Groove. <br /> Except for the B-Groove monitoring well(MWP2-BG),all well/holes drilled under this <br /> NOI will penetrate both the upper and lower aquifer systems. Well.MWP2 BG.will <br /> 26 <br />