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The measured flow in the Animas River (1986-1991) near the Mayflower Mill ranges from 116 <br /> mgd in April to 17.6 mgd in late October. <br /> 4.3.2 S rface-Water Ch�mistr <br /> Present surface-water chemistry is influenced by the natural (pre-mining)surface-water chemistry <br /> as described in section 3.2.2, and the impacts of man, principally mining. The chemistry of the <br /> flows from the Terry Tunnel and American Tunnel is described in section 4.2.2. In addition <br /> to the workings of the Sunnyside Mine, there are numerous other mine workings which are not <br /> controlled by SJCMV located upstream of the Sunnyside portals including the Ben Franklin in <br /> Eureka Gulch, and the following(mines in the Cement Creek watershed: the Big Colorado, Silver <br /> Ledge, Black Hawk, Gold King, Lead Carbonate, Red and Bonita, Adams, Pride of Bonita, <br /> Mogul, and Queen Anne. <br /> The waters in Cement Creek and Eureka Creek have been sampled just above the American <br /> Tunnel and the Terry Tunnel, respectively, since 1987. The water of Cement Creek above the <br /> American Tunnel discharge is acidic, with pH values between 3 and 5 and a mean pH of 4.0. <br /> Natural ground-water seepage and mine drainage both contribute to this acidity; however, the <br /> percentage of each contribution would require additional sampling and analyses to quantify. The <br /> water of Eureka Creek above the Terry Tunnel discharge is neutral with a mean pH of 7.1. <br /> snnjunn\sunny\110361\oct91.Rpt 50 Rev.2/11/92 <br /> can simony\,Y,"EnacQa E H�c H <br />