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<br />w <br />300 <br />z 200 <br />0 <br /> <br /> 100 <br /> <br />z 70 <br />w <br />U 50 <br />z <br />0 <br />U 30 <br />20 <br />Fe ** <br />0 0 '0 Cd oo <br />? 0 ? <br />? Pb oo <br />COND, X10-2 ©A o © o 0 0 <br />N.a • • <br />JULY MARCH MAY JUNE JULY <br />1977 1978 1978 <br />FIGURE 10. CONDUCTIVITY AND CONCENTRATIONS OF FE? CD? PB? & NA <br />AS A FUNCTION OF TIME, FOR ARGO TUNNEL WATER.