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4.5 <br />4 <br />W <br />3.5 <br />a 3 <br />~ 2.5 <br />C7 <br />J <br />~ 2 <br />z <br />w 1.5 <br />D <br />O 1 <br />S <br />U <br />0.5 <br />0 <br />VALLECITO CREEK AT USGS GAGING STATION UPSTREAM FROM VALLECITO RESERVOIR <br />(A) CHLOF~IDE <br />- . I <br />. ml <br />~I <br />OI <br />zl <br />wl • <br />of <br />zl <br />~I <br />• FI <br />• UI <br />al <br />• QI <br />' zl N <br />• ' wl <br />I <br />U <br />N • I <br />.. <br />. I . <br />• • I <br />• • • • I• <br />- • N• • I• i <br />~• Y •• I <br />. .:.. • • 4•• w • ~ <br />0.18 <br />w 0.16 <br />J <br />~ 0.14 <br />a <br />g 0.12 <br />Q <br />(Y <br />J 0.1 <br />z 0.08 <br />Q <br />z 0.06 <br />O <br />Q 0.04 <br />0.02 <br />0 <br />1975 1980 1985 1990 1995 2000 2005 1980 1985 1990 1995 2000 2005 <br />1970 <br />w 0.4 <br />J <br />w 0.35 <br />~ 0.3 <br />C7 <br />J 0.25 <br />Z <br />Ili 0.2 <br />Q <br />(Y <br />z 0.15 <br />J 0.1 <br />w <br />~ 0.05 <br />z <br />i . i <br />(B) NITRIT+ PLUS NITRATE I <br />I <br />.. I <br />ml ml <br />o I ~' I <br />I 01 <br />zl • I <br />~ I •~ U I <br />z <br />l ~I <br />• ~I • ~I <br />I zl <br />F <br />• U I wl <br />• • <br />• K I • U I <br />w ¢I,• • ~r • <br />•+ <br />wq • I • <br />• • . <br />• • • ~ I• • • • N I • Y <br />I . N . I <br />••N • N.l• • • • I <br />• •• • Y • • • •• • P <br />~{.~~ <br />• <br /> <br />• •~ <br />• Z <br />•YN • I •• N • I •• • <br />M »• ~ I • I • •• <br />«I . I N <br />I . . I . <br />~ . `N <br />, ~ <br />, • <br />• <br />.. <br />• <br />.. N I I ' . <br />.. I . I <br />. . I I <br />~ 3 <br />w <br />w 2.5 <br />d <br />U 2 <br />O <br />U_ <br />(L <br />z 1.5 <br />U 1 <br />Q <br />Q <br />w <br />~ 0.5 <br />O <br />c~ <br />0 <br />1970 <br />40 <br />~ 35 <br />J <br />(Y <br />a 30 <br />~ 25 <br />C7 <br />g 20 <br />z <br />~ 15 <br />~ 10 <br />5 <br />0 <br />1975 1980 1985 1990 1995 2000 2005 1970 1975 1980 1985 1990 1995 <br />(C) SULF~,TE <br />~I ' I <br />ml I <br />~I I <br />OI I <br />I ml <br />zl ml <br />of pl <br />wl . I <br />~I ~I <br />FI ¢I <br />UI <br />~I ~I <br />~I ~ ~ I <br />• ZI • UI <br />wl • I <br />~1 ' I <br />• • d N " I <br />• N • I <br />NN r'.•Y•i ' I • 1t <br />• ~ ~• .~ t I• •N • • • • I • f <br />' ~ • ' i r.: ' ' . .i. L't :'M 3 t • t <br />"' ~ • _ • ' <br />I • . . I <br />I ' ~ I <br />9.5 <br />9 <br />~ 8.5 <br />~ $ <br />D <br />p 7.5 <br />Z <br />Q <br />cn 7 <br />z <br />a 6.5 <br />6 <br />5.5 <br />5 <br />1970 1975 1980 1985 1990 1995 2000 2005 1970 1975 1980 1985 1990 1995 2000 2005 <br />Figure 7. Concentrations of selected ';'v~ater-qualin~ constituents oti°er time for Vallecito Creels at <br />the USGS gaging station (data from USGS data base). <br />,5' ~~ Southwest Hydro-Logic 19 <br />