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APPENDIX A <br />Water quality standard (WQS) based effluent limitations are calculated <br />using the following mass balance formula: <br />EL = WQS 07-10 + QEFF) - 07-10 X CAMB) <br />QEFF <br />Where: <br />EL = Calculated effluent limitation (mg/1) <br />WQS = Applicable water quality standard (mg/1) <br />Q7-10 = Receiving water 7 -day, LO -year low flow (25.9 cfs) <br />QEFF = Maximum effluent flow (4.99 cfs) <br />CAMB = Ambient instream concentration (mg/1) <br />Following are some specific calculations: <br />Total Recoverable Iron <br />EL = 1.0 (25.9 + 4.99) - (25.9 X 1.06) <br />4.99 <br />= 0.69 (this is less than the WQS, thus 1.0 will be the limitation) <br />• Total Recoverable Zinc <br />EL - 0.05 (25.9 + 4.99) - (25.9 X 0.015) <br />4.99 <br />= 0.23 <br />• <br />