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<br />, " '1- <br />tilll}.I,J <br /> <br />NAVAJO WELLS WITH UPPER PALEOZOIC <br />AQUIFER ISOTOPIC SIGNATURE ARE <br />. LOCATED IN AREA 'VITH POTENTIAL FOR <br />VERTICAL FLOW <br /> <br />375 <br /> <br />o <br /> <br />o <br /> <br />37.4 " <br /> <br />o <br /> <br />,9 <br /> <br />0(10.200) <br />(12.200) <br />t::. <br /> <br />~ <br /> <br />37.3 " 0 00 <br />Z!. <br />AreaiMlelf'l1yd'auhl; ~ - <br />graa.el'l1'SlavOfaDle.......... /0 <br />IOfupwa'O""aler .......... /' <br />fnO\I('lT"II'nllromltle 0 <br />Upp.lfPaleolOlc 0/ <br />aqUltersl01h(' <br />37 2 Nav8joaql.lle' / <br />. (Freetheyana / <br />Coody. 1991) <br />( <br /> <br />-~ <br /> <br />. <br /> <br />\ <br />^ \ (l1.!>OO) <br />~ (8.800) ^ <br />(7.000) G........ ~ <br />'& q 0 <br />o (7.600~ I 0 <br />o 0 (8,500) <br />o ~ '(8,900) / <br />o 0../ <br />-- <br /> <br />o <br />(11.800) <br /> <br /> - -- <br /> (11,400) <br /> 0 0 <br />37.1 0 <br /> 0 <br /> 0 0 <br />37.0 . <br />109.5 109.4 109.3 109.2 109.1 109.0 <br /> <br />6. (1.0001 'Nel1~edInN.lvaio~er' .1I"Sfvaluehewale, 5I1T'OI('5 <br />lrornll'>f!olJpp('tPa1e<llOlCaQlJl!('r (II' 'Sr ~ 470r d 13oe'rndJ <br />~moer by Slp'mboI ,sdossolved'9Ol'Osconcenffl1,on.,nmoll'9ramspe, hter <br />o (8,900) 'ItIeI1~edmNavajo~.'_.6"S' valueur'lll~e_le' 5iI"",es <br />Ifomll'>f!ol.JDpe'Paj~lOtCaq...te'(6e'S'<047or:>1l3t)('lmol) <br />~'tly9fm/;lol'sdoSl5Dl"ea'9Ol'd5Conc(''''ral'0f1.,nmoll'gramsoe.ltle' <br /> <br />. <br /> <br />The location of Navajo aquifer wells with a <br />Sk'7Sr signature of water from the Upper <br />Paleozoic aquifer (mean value.t 1 standard <br />deviation) were compared 10 the area <br />identified by Freethey and Cordy (1991. p. <br />83) where Ihe hydraulic gradient is <br />favorable for upward leakage from the <br />Upper Paleozoic aquifers inlo the Navajo <br />aquifer (adjacent figure). Five of the len <br />Navajo wells with SlnSr value most similar <br />10 water from the Upper Paleozoic aquifer <br />are within the area where Ihe hydraulic <br />gradient suggests a potential for upward <br />movement 10 the Navajo aquifer (adjacent <br />figure). The majority of Navajo aquifer <br />wells with dissolved-solids concenlration <br />exceeding 6.500 mgIL arc also within or <br />nearby the area where a potenlial for <br />upward movement from the Upper <br />Paleozoic aquifer exi!'.b (adJacenl figure). <br /> <br />A"erh ProgreH ReportuFrbruary /995 <br />