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• <br />Comprchemire Analylinl Results Report <br />Fist and West Willow Creek <br />~!~ <br />i' <br />1 <br />4 <br />.__ <br />-.. <br />i <br />Creede Mining District Sediment Samples <br />(concentrations in milligrams er kilogram) <br />Analyze Avenge <br />Ba<karound Aeeraae Value Bleeated <br />Releae Sample N pewted <br />Reease Sample FOehe+t <br />Reease Yalue LaaUoa <br />Hiahest Release Sample <br /> <br /> _i <br /> s <br /> s <br /> i i <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />5.3 Surface Water Analytical Results by Stream Segment <br />5.3.1 West Willow Creek and Nelson Creek (SW/SE-Ol through SW/5E-13) <br />Wesc Willow Creek sediment and surface water samples generally do not exhibit elevated <br />concentrations upstream of the Amethyst Mine. Beginning at location SW/SE-04, several atlalytes <br />increase to elevated concentration levels for aqueous and sediment samples. Below SW/SE-04 <br />several analytes exhibit a continual increase due to an abundance of diffuse mine sources. <br />Concentrations increase in West Willow Creek immediately below Nelson Creek, although loading <br />analyses (fable 8) reveal that Nelson Creek itself does not significandy contribute to this increase. <br />The most significant increase in metals loading along West Willow Creek occurs over a 1-mile <br />stretch near the Commodore Mine between SW/SE-OS and SW/5E-10 (SW/5E-09 was not <br />collected). Total cadmium concentrations increase from 5.5 micrograms per liter (µg(1) to 294 <br />µg/I, total lead concentrations increase from 13.5 to 465 µg/l, and total zinc increases from 348 <br />to 19,900 µgll. Loading analyses reveal that most of the increase is due to diffuse sources and <br />unseen ground water to surface water flows. The dissolved zinc load being carried by West <br />Willow Creek increases from 46.66 pounds per day (ppd) a[ SW-8 to 185.75 ppd at SW-10 (Table <br />8). The Nelson Tunnel discharge contributes less than 8 ppd to this load increase. <br />9 <br />