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<br />Table 19. Results of Wilcoxon rank-sum test (1-tailedl of pre-treatment (April 199O-March 1992) and post-treatment <br />(April 1992--March 1993) instantaneous streamflow and zinc concentrations at selected sites in the upper Arkansas <br />River Basin <br /> <br />{fillS, cubic feet per second; IJglL. micrograms per liter; <,less than; s,less than or eqUll.l tol <br /> <br />Streamflow <br /> <br />Site name <br />(see 'able') <br /> <br />Dissolved zinc <br /> <br />Pre-/post- <br />treatment <br />median 1 <br />(~g/L) <br />.... . i:3,OOOlJ4 .'. <br />t'lAooi2;600 · <br />.161J124 .' <br />.2301110 <br /> <br />'~:;:r" .' ". <br /> <br />54/30.. <br />.4(120 .... <br />14/9 <br />..: .I0f4'.. <br /> <br />Totel-recoverable <br />zinc <br />Pre-/post- <br />treatment <br />median 1 <br />(~g/L) <br />.'. . .3,OOOf20 . .' <br />.., 14 0ll0Ii ssil <br />.: .. . . :J..... . :. ~ :... <br />. ,210/49 <br />'. '),901t80 <br />1201100 <br />110180 <br />85180 <br />'8MO <br />.;. <br />50150 <br />40/50 <br /> <br />Pre-/post- <br />treatment <br />median 1 <br />(It'IS) <br />Leadville Mine Drainage Tunnel 2.312.4 <br />California Gulch 1.811.8 <br />Leadville 70158 <br />Malta 991134 <br />Granite 2771470 <br />Buena Vista 400f462 <br />Nathrop 5631717 <br />Wellsville 5241742 <br />Parkdale 5821843 <br />Portland 5121800 <br />I Significant differences (psO.05) are shaded. <br /> <br />p-value <br /> <br />p-value <br /> <br />0.38 <br />,50 <br />.50 <br />.35 <br />.45 <br />.45 <br />.45 <br />.38 <br />.41 <br />,18 <br /> <br />0,01 <br />,02 <br /><,01 <br />,01 <br />.02 <br />.01 <br />.01 <br /><.01 <br />.11 <br /><,01 <br /> <br />Table 20. Number of sampies that exceeded acute and chronic zinc water-quality standards <br />in the upper Arkansas River. April 199o-March 1993 <br /> <br />[--, no standard available) <br />SIte name Number of Number of semple. that exceeded standard ' <br />(.ee teble 1) semples Acute ChronIc <br />analyzed standard2 standard3 <br />Leadville 28 18 I' <br />Malta 26 0' <br />Granite 27 I. <br />Buena Vista 28 o. <br />Nathrup 27 I. <br />Wellsville 27 O. <br />Parkdale 27 O. <br />Portland 26 0 0 <br /> <br />I Acute and chronic zinc standards are based on dissolved~zinc concentrations (Colorado Department <br />of Health, 1994). <br />2 Acute standard = e(O.8473[ln{hardness)]+O.8604) <br />3 Unless noted: Chronic standard = e(o.&473fJnihardnesS)j+O.16141: <br />4365 micrograms per liter. <br />5118 micrograms per liter. <br />6 130 micrograms per liter. <br /> <br />36 W.ter.Quellty Assessment of the Arkans.s River B..ln, Southeestern Colorado, 199G-93 <br /> <br />p-v.'ue <br /> <br /><0.01 <br />.02 <br /><.01 <br />.01 <br />.44 <br />.05 <br />.28 <br /><.01 <br />.45 <br />.20 <br />