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<br /> <br />. <br /> <br /> <br />c, <br />O,! <br />::.., <br />. . <br /> <br />SPECIAL S'7'liJIE:::' <br /> <br />!n.oni :.oring syst."-"~ '..1.11 be especially v"1luable in pr vir:Unr; hta .~O!' the <br />ne.....ly instituted ";later Quality I:::pr:l....ement ?rogra"'l'. in thQ basin. <br /> <br />In.:er C.llorad:) Hi v~r Salinit:.,' ~n""esinlticns <br /> <br />Ir: 'a.'1uar.f of 1970. t:-JC Bureau of' Recl~nti ~n be;'"f~l a trial progrrJ.."=1 <br />to analj"Ze the source and mak~up of the salt lead arriving at I=.perial Darn <br />on a daily basis. Conductivity mensur"..r.ents ..-ere :r:.adc eacb :lay at 10 <br />station.s betweer. larke!' Da::J 1J1d Imperia:.. D~. The net""--'rk included essen- <br />tially all significant diversions, surface return rlows~ ~'1d ~6jor river <br />5tations. <br /> <br />An intensive prObTa.ll was carried on +'or --:Jne yea:. After .')0(" :rt;!tU" of <br />operation. the frequency of sampling ....M chunged. r-'urinf:" the fall ~f <br />1971. an (':<permental progra.-=: of 9.utOl:l!ltic salin! ty :::f">ni torinb '..res zta.rted. <br />Conductivity pr.:>bes were installed at nine statil'ns m ".he lower river and <br />the d'lta transmitted by tele!::let!"J to the Boulder -'ity and Ittperial ~!IJ.."!l <br />o:f_f'ices, Th<: nine stations are as fo11O\.,''$: <br /> <br />1. Colorado River below Hooyer Darn. <br />? Colorado River at Headgnte t; ~ck Da.m (CRIP. . <br />3. Poston Wastew!\y Gage (CRIR above PVDD \ . <br />4. Colorado Hi ver at the Pal.:"! Verde [Ii version 1')rt,":". PVDD', <br />5. Colorado River at the Ta,yl'Jr FeY'ry :Jage, <br />t. Colorado River at the Cibola Vall~J Gage, <br />7. Yut'l.a ~1esa Drainage ~ Soutlet. <br />A ~1ain Outlet Drain Extension Bifurcation ""or ~.IODES " a.'1d 3. <br />9. '''olorado River at the :~ortherly Inten:ational Boundary. <br /> <br />Samples are collected from 10 stations, ~ive of 'Nhich are tele- <br />metered stations. Individual s~les are analyzed for cond~ctivity. <br />Tl-le V.S. Geological Survey Laborator",f makes ....eekly a.'1alyses for total <br />dissolved solids (residue at l80Dc. and monthly an~ses of the chem- <br />ical constituents of CO!:lposite sB.r.1ples. <br /> <br />Samplin~ frequencies for these stations ~~re selected fro~ an <br />an~vsis of past records so that sa~les N~d represer.t the ~ctual salt <br />load N~th an error of less than ~ percent, 95 perce~t of the time. These <br />stations and the selected frequencies are sho.,.n in tlle following ta.bula- <br />tion: <br /> <br />10 <br /> <br /> <br />