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<br />- - <br /> <br />.... <br />-...] <br />IV <br />U1 <br /> <br />Salinity <br /> <br />r <br /> <br />.............. -- <br />- <br /> <br />,-- <br /> <br />--- <br /> <br />r - -~~'7r)"-;t <br />r~.~@m)7,f?rli! " <br />/1 . ~ - X '-'0VI5. Departmenl 01 the Inlerior <br />il '." 0 8 198? BOreau of Reclamalion <br /> <br />U d t CO~O~OI//1DO WA~. Quarterly Report on !he <br />P a e . .S.!i!I.ltto", 80~'!, Colorado River Waler Quality <br />"D Improvemenl Program <br /> <br />- <br /> <br />July 1982 <br /> <br />-- - <br /> <br />- <br /> <br />~ <br /> <br />~ <br />-......"" <br /> <br />- <br /> <br /> <br />... <br /> <br />~ <br /> <br />- <br /> <br />- <br /> <br />~ <br /> <br />- <br />....- <br /> <br />- <br />- <br /> <br />- <br />.~ <br /> <br />- <br /> <br />- <br /> <br />~ <br /> <br />-- <br /> <br />-=- <br /> <br />COW"".."", ,.... 01 k>w~ La, V..,'" W"",. k/o'''no 10."0 ....k. M.", p"",,, in 10""",""" ... '''' br 0"'""" .,,~ _ <br /> <br />Las Vegas Wash Revisited <br /> <br />The Imn ....ater to trow from Las Vegas <br />.yasl'110 the Colorado River In recent n'slory <br />llher than Il'lfreQ!.JE?fll Storm r~noft to.;.gan In <br />-.e early 19..1lJs ....'1en waler .....as dn.'er!/:'l1 <br />urn the nYef to suoply a magnesium <br />rocessmg ComDIe~ al Henderson, Nt>vaoa <br />unCreds 01 acres of tailings DOnds were <br />),/,! b(>~ the comple.. al'ld the Wash 10 <br />Geive process wasreo.o.aler <br />The was~e'Ware' soon began seeping mlo <br />~ grOUnd lhrougn me nearly JO..IOOI~D <br />j of COarse sand MId gravel Ul"lOerlYlflglhe <br />'lCs \l'1hen Ehe ....aler reacheQ the less <br />meab~. Ime,,-gra;f'led l'l1CI:enai assoclate.::l <br />1 a (jeep !ormal'Ot"1 ...novm as :he Mvady <br />eo, It was aef;';>(;le.:! lOvvard Las Vegas <br />).., <br /> <br />~-~ ..._~. <br /> <br />A fecenl r'ev'f'\.v of well and auger hole lOo:,;lS <br />re\13ale<j a I1lgh Dercentage 01 gYpSum In <br />SUbsurlace SOils lrrrOUghOt.JI tl1€ lower Las <br />Vegas VaHey Tnls U1di('31es thaI !he <br />IrlOustnal ....aste....ater prObably nor only <br />earned prOCess waste salts ,t also leached <br />natrye salts as II S€'eped mto and through the <br />Wash <br />As sev.age treatmenl plant e~iuenl from <br />Las Vegas Increased along >'.Im!he areas <br />POPulatIon :r1e effluen: Spread tu~nt'r dOv..r: <br />me Wash until II rOOC/1€(] the Lo.....er '.'/ash In <br />1955 Ten years later Reclamation began <br />monltonngmesalln'tyottheet/lu.:>m A 1971 <br />Reclamallon '€'POrt S1lOwe:l !flat the maJOr <br />IflCrE'aSe In 5abnlty apPeared 10 be In me <br />same reaCh apoarfJf'lll, receivIng ~ge <br />from Ehe Industnal taIlings OOncIs <br />Ear/y prODOsaIS for contrOlllf1g wastewater <br />enlenng la~e .....'00d VIa the ',Vash talfeo ~or <br /> <br />linE'(] Channels Or PIDelmes to convey the <br />e11luenl bat... to the "ver belo.... Hoover Dam <br />Or 10 a dry la..e north 01 the Wash The plan <br />lor e~DQr111'lg Wastewater to the dry lalle <br />InclUded usmg Dart Of the sewa~ plan! <br />€'tfiuent fo maintain a grt'ent:'lf1lt In Las Vegas <br />"iaSh Wastewater releaseo 10 the UPPer <br />wasnwOUld nOI be COnlp1etely consumed by <br />the vegetation. so a !aclHy to mtercept <br />Surplus waslev.a!er reaChmg l!'le lower .....ash <br />was rteedoo <br />In 1973 Rt"Clamatlon Was asll€C 01' tne <br />States Co1oraoo R'Ver CommISSion and the <br />Ciarlo, County Boarc at Commlss!()ne~ 10 <br />InItiate S:ualeS Ie.aC!ng 10 COnstruct,on Of a <br />FE'derai salInIty COnlrol pia" tor lhe ,"'ash The <br />ne~t year Reclarnatlon 'E'COrnmerlooo a <br />sallnl!)' COntrOl plan tl1.a: InclUded the <br />PrevIOusly prOOOst>d laCillty fOl In:erceplrng <br />.....aste-...a:er 1'1 tne lower ....ast'1 as ...eH as a <br /> <br />