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Electrical Conductivity <br /> 3,500 <br /> 3,000 <br /> 2,500 <br /> MW-1 <br /> MW-2 <br /> E 2,000 <br /> y —®— MW-3 <br /> 0 <br /> E MW-4 <br /> 1,500 <br /> —*— MW-5 <br /> 1,000 — SB-1 <br /> 500 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />