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_n INIZ11 <br /> j. H. KLEINEELDER &ASSOCIATES <br /> to Appendix D) employed. The thickness of Zone IV at location MW-1 <br /> (former location of the underground gasoline storage tanks) appears to be <br /> less than 4 feet (refer <br /> to Appendix D). The thickness of Zone IV at <br /> location MW-2 (south end of contaminant plume) also appears to be less <br /> than 4 feet (refer to Appendix D). <br /> To illustrate the variation in elevation of the 'Lone IV/Zone V interface, <br /> a contour map has been prepared (Figure 10). Elevations of the interface <br /> between the uppermost water-bearing unit and the underlying aquitard <br /> ranges from a (-) 29 feet M.S.L. to <br /> elevations are lowest in the vicinity of MW-1 and Mw-2t M.S.L. feet' The <br /> ' <br /> geometrical , therethareby forming a <br /> trough or channel trending north-south. The 'elevation <br /> gradient measured between MW-6 and MW-i at this interface is 6.1 � <br /> the interface between Zone IV/Zone V is not level but exhibits percent. <br /> s` <br /> variation in patterns that have been ma geometric <br /> peed (Figure Ip). <br /> The uppermost water-bearing unit (Zone IV) is hydraulically separated from <br /> a deeper aquifer (Zone VI) by an aquitard (Zone V). The magnitude of this <br /> hydraulic separation is unknown. The degree of hydraulic separation <br /> function o£ the thickness P n is a <br /> of Zone V. To illustrate the variation in <br /> thickness of Zone V across the project property, an isopach map has been <br /> prepared (Figure 9). <br /> i <br /> b <br /> F <br /> 53-87--443 18 <br /> Ohl <br />