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<br /> <br />alluvium. The sample collected at site 23 represents the <br />• quality of these flows after dilution with water in the east <br />branch of the Animas River. Thus the concentration of <br />pollutants the flows emanating from under the old pond are <br />higher than indicated. <br />BAT standards now apply to the metals listed in Table No.5, <br />while BPT standards apply to TS5 and the more restrictive <br />state pH standard of 6.5-9.0 would apply instead of the EPA <br />standard of 6.0-9.0. The state has classified the Animas <br />River from its source to Elk Creek as Class 2 Recreational <br />Use with effluent standards consisting only of fecal <br />coliforms at 2000/100m1 and pH 6.5-9.0. The lacF: of <br />standards for metals is due to the the current high <br />concentrations; however it is planned to promulgate same <br />standards "in about a Year" (Duane Anderson, WQCC, verbal <br />communication, 11/27/85). The pH of the discharge at site 23 <br />does not meet the state standard for this segment of the <br />river. In the absence of state standards for segment 2, the <br />EPA standards far er.isting and new sources would apply, <br />subject to the more restrictve state standard for pH. <br />Table No. 5: EPA Effluent Limitations for Base and Precious <br />Metals Flotation Mills; 4DCFR Part 440, 7/1!85 <br />Existing Sources New <br />Sources <br /> BPT BAT <br />• 1 2 1 2 <br />TSS,mg/L 30 20 <br />Cu, 0.3D 0.15 0.30 0.15 None <br />Zn, 1.0 0.5 1.0 0.5 Allowed <br />Pb, 0.6 0.3 0.6 0.03 <br />Hg, 0.002 0.007 O.OD2 0.007 <br />Cd, 0.10 0.05 0.10 D.OS <br />Ph 6.0 - 9.0 <br />(1> Mar,imum for 1 day <br />(2) 30 day average <br />The Animas River below Elk Creek (segment 3) has been <br />classified far cold water aquatic life with the attendent <br />strict effluent standards. A complete copy of these <br />standards is included in the appendix, the inorganics <br />standards are given in Table 6. <br />While segment 3 commences 11 miles downstream, the impact of <br />proposed discharges into segement 2 on segment 3 could be <br />considered in establishing limits. However; indications are <br />that the state would employ federal BPT standards in the <br />absence of stream standards. <br />• -15- <br />