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s <br /> +- B-1t3 <br /> GROUND SURFACE B-3 d-6 B--$ B-10 <br /> �_-- — <br /> 5 <br /> H <br /> Lu <br /> z <br /> 10 p <br /> N <br /> 15- <br /> 0 <br /> spm o <br /> Y <br /> 20— <br /> w <br /> N <br /> w <br /> 25 0 <br /> r <br /> 3d <br /> Llt <br /> y z <br /> 0 <br /> i <br /> N <br /> 35 ! <br /> 4d POTENTIO ETRIC <br /> SURFACE <br /> HORIZONTAL &VERTICAL SCALE: 1'-5° <br /> 2 so J.H, KLEINFELDI <br /> 3 SCole In Foet C101MINICAL COHSVO <br /> LINES OF EQUAL CONCENTRATION (ppm) PROJECT NO. <br /> L. _ <br /> f <br />