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90189K-1-10 COT-2 <br /> Table 2. LABORATORY RESULTS SUMMARY - ENTIRE PROGRAM (concluded) <br /> Total <br /> Dissolved Total Total Hexavalent Total <br /> Sample Date Conductivity Solids Copper Lead Chromium Nickel <br /> ID Sampled (pmhos) pH (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) <br /> MW-4 20 May 1988 999 7.5 732 0.13 <0.05 <0.01 0.11 • <br /> 23 August 1988 1,130 7.4 779 0.10 0.020 <0.01 0.10 <br /> 1 December 1988 937 7.6 683 0.092 0.020 <0.01 0.08 <br /> 28 February 1989 987 7.4 660 0.025 0.008 <0.01 <0.04 <br /> 30 May 1989 1,020 6.0 704 0.015 <0.005 <0.01 <0.04 <br /> 31 August 1989 1,120 7.0 773 0.055 <0.005 <0.01 <0.04 <br /> 30 November 1989 1,050 7.3 699 <0.010 <0.0050 <0.01 <0.04 <br /> 27 February 1990 937 7.4 737 0.043 0.0069 <0.010 0.041 <br /> 1 June 1990 1,060 7.6 683 0.065 0.010 <0.010 0.040 <br /> • <br />