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<br />HASIC tT\:EU SITE WATER-QUALITY SA~II'U:\G <br /> <br />At each ba,ic tilled ,ile, mnnthly and.three cUrem~ (low and <br />high lIow) water-quality samples arc cO]]I.,'(:IOO cllch ye.lf. Following <br />are the mea,urt'ments and analyses perfonned for each sample: <br /> <br />r'~~Ttasurements: <br />Dissol\'Cd o.lt,y!!M;, p ,atkalinity, specific conductance. <br />....aler temperature, and t1ischarg~ <br /> <br />Labomtory anah'scs for com:entrations of: <br />Su...pended ..ediment <br /> <br />Major con,tiluenb: <br />Dif>sohed solid" c;J.kium, chloride, fluoride, iron. manganese. <br />pota......ium. silica, sodium, and sulfate <br /> <br />Numents: <br />Tolal and tOlal dis~hed nitrogen. ammonia. nitrite, nitr,He, IOlal and <br />total disMlI\'cd pho...phnrus, and orthophosph.lle <br /> <br />Other: <br />Di......ol\'eJ and suspended organic carbon <br /> <br />~.~=-: <br /> <br />-" <br />I ~ .. <br />'::I I!!~ <br /> <br />- "r"'~J1 <br />- I <br />~ -- <br />_ L" <br />~ <br /> <br /> <br />;:: <br /> <br />Pbowgr.oph toy RarvJy Pmcr <br /> <br />Upper Colorado River study unit basic-fixed-site network-contlnued <br /> <br /> Mean daily !low duration statistics' <br />1G-percent 5O-percenl 9O-pereenl <br />~xceedance exceedance exceedance Based on <br /> water years <br /> (Cubic leet per second) <br />14,4(J0 4.420 2,600 19711-95 <br />9,:HO 2..120 1530 lonO-l,l'i <br />5.000 iJ.lO l(1U 1970--95 <br />4.970 1,120 890 197(}....1J:'i <br />2510 IJ120 280 1970-95 <br />Ne.... j!:a~in~ station. no historic ~treamt1ow information <br /> <br />I.mm <br /> <br />105 <br /> <br />" <br /> <br />1970-72. <br />80--81,94---95 <br /> <br />New gaging station. 1'10 historic stn:'amflow infllf1T1ation <br /> <br />'" <br /> <br />80 <br /> <br />,) <br /> <br />1970-95 <br /> <br />~CW g3ging station. no historic ..trcamllow inf~lITlla[ion <br /> <br />89 <br /> <br />~6 <br /> <br />1970-95 <br /> <br />J.8 <br /> <br />Ne.... gaging 'Mion. no historic stre3mtlo.... informati,ln <br /> <br />~CW gaging station. 1K1 hi"lOri..- "U"l:amf!ow infOlnnatltlCl <br /> <br />205 <br /> <br />" <br /> <br />6.6 <br /> <br />1970-95 <br /> <br />lD-~ll} 3'CTa~11o.._1hat 1lRC"~ccedcd IO.50.~90~n-.:nt"ftl'lel1n"lC" <br /> <br />Historic <br />water-quality <br />data <br /> <br />Primary reason tor site <br /> <br />y~ <br /> <br />OUllcl oflhe study unit <br /> <br />Yes <br /> <br />~faln'~lem sill.' Uf"'tream fmm the Grand Valley <br />agri"ulturalare;i <br /> <br />Limited <br /> <br />~1ain.~leDl site near ph)~iographic province buundary <br /> <br />Yes <br /> <br />Near mouth of largest tributary in slud) unit <br /> <br />So <br /> <br />Dt>wn,m:am fnlDl m3jOf re-..:,,'ojr ")stem. <br />Ha.....hne _ite for tho: lower GUllni..on Ri\'er H"sin <br /> <br />No <br /> <br />Up'lream from m;ajof ~rvoir s)'tem. <br />Illtq:roitor of me uppt.'r GunniSllCl Rher Basin <br /> <br />Limit~ <br /> <br />Downstream fnlffi .area 01 rapid urhanil;ltion <br /> <br />~o <br /> <br />DOl.... n~tream frum 3tt'.1 of rapid urhani131jon <br /> <br />1'0 <br /> <br />Dow nstream from area of mt'lal mining <br /> <br />~o <br /> <br />Dn.... n,tream from area of metal mining <br /> <br />Limited <br /> <br />Do....n'trl:am hom agri,'uhural atC'a <br /> <br />Limiled <br /> <br />OO....n-.trc'am from agricuhul"'..ll area <br /> <br />So <br /> <br />ReferellC't' ..ite for Colorado Plal.'au <br /> <br />So <br /> <br />Rd.-ref'll:": ..it,' fur southern ROI:!..) !o.lwntains <br />