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Table 5. Water quality data and relevant standards used in the antidegradation calculations <br />Survey Cadmium Chromium Copper Iron Lead Manganese Zinc Hardness <br />Station (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) <br />Chronic aquatic life water <br />quality standardsa (WQS) 2.84 11 11.8 1000 3.57 1,836 155 138 <br />EPR_Outfall 0 0 3 20 0 8 3 142 <br />Baseline low-flow concentration (ER_A1) 0 0 0.6 20 0.3 0 2 97 <br />Significant concentration threshold 0.43 1.7 2.3 167 0.8 275 25 -- <br />Downstream (ER_B7) 0.1 0 0.5 5 0.1 0.6 5 138 <br />1 mile downstream of ER_61 (ER_WBt) 0 0.2 2 40 0.2 2 20 136 <br />Note: Significant concentration threshold = ER_A1 +((0.15)' (WAS - ER_A1)) <br />-- -not applicable <br />Concentration data for ER_A1, ER_B7, and ER_WB1 are average concentrations during the period when <br />EPR outlet is discharging. <br />e Based on a hardness of 138 mg/L (as measured at ER_B1) and calculated from Table 3 of Rule 31, Section 31.8. The chromium <br />standard is for chromium(VI). <br />Boulder 1\Groups\Data ManagementlClimax\tablestosend.xls\Table5\ 5/21!01 (10:03 AM) <br />