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<br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale, Page 9 Permit No. CO-0026981 <br />APPENDIX A (Continued): <br />EL (T Pb) = 0.12 (1.5 + 2.7) - 0.0095 (2.7) = 0.32 mg/1 = 0.30 mg/1 BAT <br />' Interim 1.5 November through April <br />EL (T Pb) = 0.12 (1.3 + 6.3) - 0.0079 (6.3) = 0.66 mg/1 = 0.30 mg/1 BAT <br />~ Interim 1.3 May through July <br />EL (T Pb) = 0.12 (3.5 + 3.9) - 0.0060 (3.9) = 0.25 mg/1 = 0.30 mg/1 SAT <br />~ <br />Interim 3.5 August through October <br />EL (TR Pb) = 0.037 (1.5 + 2.7) - 0.0095 (2.7) = 0.087 mg/1 <br />Final 1.5 November through April <br />EL (TR Pb) 0.037 (1.3 + 6.3) - 0.0079 (6.3) = 0.18 mg/1 <br />Final 1.3 May through July <br />EL (TR Pb) = 0.037 (3.5 + 3.9) - 0.0060 (3.9) = 0.072 mg/1 <br />Final 3.5 August through October <br />EL (T Hg) = 0.0001 (1.5 + 2.7) - 0.000022 (2.7) = 0.00024 mg/1 <br /> 1.5 November through April <br />EL (T Hg) = 0.0001 (1.3 + 6.3) - 0.00 (6.3) = 0.00058 mg/1 <br /> 1.3 May through July <br />EL (T Hg) = 0.0001 (3.5 + 3.9) - 0.000027 (3.9) = 0.00018 mg/1 <br /> 3.5 August through October <br />EL (T Zn) = 0.44 (1.5 + 2.7) - 0.21 (2.7) = 0.85 mg/1 = 0.50 mg/1 BAT <br /> 1.5 November through April <br />I' EL (T Zn) = 0.44 (1.3 + 6.3) - 0.23 (6.3) = 1.5 mg/1 = 0.50 mg/1 BAT <br /> 1.3 May through July <br />EL (T Zn) = 0.44 (3.5 + 3.9) - 0.27 (3.9) = 0.63 mg/1 = 0.50 mg/1 BAT <br /> 3.5 August through October <br />