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SECTION THRU SAN JOAQUIN RIVER <br /> AND THE PROPOSED PERCOLATION PONDS <br /> z <br /> C) <br /> � cll� <br /> EXISTING GROUND <br /> j0 <br /> ELEVATION -76.8 — _ -ELEV. 1460 ELEVATION - 16.8 <br /> 100 YEAREVENT F �� 100 YEAR EVENT - <br /> 10 'MARCH 1983 W' 1 . ' MARCH 1983 10 <br /> °D 450't PROPOSED <br /> N <br /> � PERCOLATION <br /> 0. . . . . . . . . . . . . PONDS, . . 0. <br /> -10. , , . . . . . . . . , -i0 <br /> 0 200 400 300 1600 <br /> SCALE: 1"=400' HORIZ. <br /> 1 10'VERTICAL <br /> egh KIER & WRIGHT <br /> CIVIL ENGINEERS & SURVEYOR'S INC. <br /> 5880 West Las Poaitas Boulevard, Suite 34 <br /> Pleasanton, California 94588 <br /> EXHIBIT 4 <br />