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• 1987 at two points on the San Miguel River; 1) upstream of the confluence with Calamity Draw <br />{San Miguel #2); and 2) downstream of the confluence with Tuttle Draw (San Miguel #1). The <br />results of each silver and chromium analyses performed at each surface water monitoring site can <br />be found in Attachment 2.04.7-11 (Peabody Appendix 7-9). The results of the additional analyses <br />for silver and chromium showed that total recoverable chromium never exceeded 10 ug/I; and that <br />silver exceeded 10 ug/I once each (20 ug/I at sites SW-N3, SW-N7 and SW-N102). Compared to <br />standards adopted for the nearest applicable reach of the San Miguel River (Segment 5), all <br />analyses for chromium (total recoverable) were well below the standard (25 ug/I). Unfortunately, <br />the detection limit used by the laboratory for silver (total recoverable) was 10 ug/I, significantly <br />higher than the standard (.1 ug/I). <br />With respect to Colorado Department of Health (CDOH) receiving stream standards (CDOH,1983, <br />revised 1986), Tuttle and Calamity Draws lie within the Stream Segment 12 of Region 10 of the <br />San Miguel River. Because the fisted parameters (physical and biological, only) are not applicable <br />to both Tuttle and Calamity Draws, the nearest segment (downstream) in which applicable <br />standards have been promulgated (Segment 5) are used to compare surface water quality of <br />• Calamity (SW-N103j and Tuttle Draws (SW-N3, NPDES 001 and NPDES 006}. <br />Exceedences were observed at three sites: 1) iron at San Miguel #1 (downstream of Turtle Draw); <br />2} zinc and manganese at SW-N103; and 3) nickel at NPDES 006. <br />Based on the rigorous comparisons made, it is evident that water delivered by the West Lateral <br />Irrigation Ditch is of sufficient quality for drinking water, agricultural use and livestock drinking <br />water. This water originates from the San Miguel River upstream of Naturita, and is currently the <br />primary source of water in the vicinityfor the previously mentioned uses. Surface water in Calamity <br />and Tuttle Draws, as well as the monitored tributaries, is not suitable for use as a source of drinking <br />water. WFC has knowledge of irrigation being conducted using water from Calamity (Mr. Mel <br />Staffs, south of WFC Permit Boundary and bordering Calamity Draw). However, all surtace water <br />monitored at sites established in the New Horizon 2 area fall into suitability criteria for livestock <br />drinking water and irrigation. Livestock and wildlife commonly use Calamity and Tuttle Draws as <br />sources of drinking water. As long as the Colorado Co-operative Company continues to operate <br />the ditch system, there will remain a sufficient supply of water well suited for domestic (drinking), <br />. agricultural and livestock use. <br />REVISED JULY 2006 2.1)4.7-42 <br />