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WSP06433
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Last modified
1/26/2010 2:22:45 PM
Creation date
10/12/2006 1:37:37 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8273.300
Description
Colorado River Basin Salinity Control - Federal Agency Reports - USGS
Basin
Colorado Mainstem
Water Division
5
Date
1/1/2000
Author
USGS
Title
Water Quality in the Upper Colorado River Basin - Colorado 1996-98
Water Supply Pro - Doc Type
Report/Study
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<br />eQI/CENTRATlm, I~. MICROGRAMS PER LITER <br />50 100 150 200 <br /> <br />~ <br />"., <br />I- <br />00:>. <br /> <br />o <br />f,'ET~VL TERr,BUTYL ETHER -eI <br />f <br />'ETRACHLOROETHEr.'E . <br />f <br />CHLOROFORM . <br />f <br />, . ~,TFl:ICH~OROET~Ar.E- <br />, <br />, 2~-TI<:IMETHYLBEl\;CENE 9.L9_nn , - <br />, <br />O""COROM""'" ;6.11 <br /> <br />I <br />~_-'-'Cllli'''''''' <br />IL~,~oI_,,!,:Ie<.~__ <br />5 10 15 W <br />FREQUENCY OF VOC DETECTION IN PERCENT <br /> <br />o <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />--- <br /> <br />c:c.nc-.lion <br /> <br />Figure 10. Volatile organic compounds were detected at low frequencies In <br />mOnitoring and drlnk-Ing.water wells sampled in the Southern Rocky Mountains, <br />With a few exceptions (2 samples), concentrations of VOCs were substantially <br />less than .....ater.quallty standards, AU concentrations shown are greater than <br />o ug/L (MCL. maximum contaminant level: HA. health advIsory" <br /> <br />~'TBE wa... lkle~ted In waler from <br />ll[}t' ll111ni~ipal well. ;\'lTBE Cl'n- <br />~t.ntr..tjlJn~ gr~alt'r than dlt? drink- <br />ing-v.aler lifetime health ..d\i...ur~ <br />llf 20-../.(J ~lg/L I U.S. ElH'ironmt.'n. <br />la] PrPlel'fillll Agelll:~. 1997) wert. <br />nO! detc-clI.:d. il(lw\:'h'r. unl'e <br />"'THE enl.:r... Ih.: ground water. it <br />i... k...... \ulnl.:rJble tll dC~(lrnpo...ition <br />and lra\'cls farther lhan mher <br /> <br /> <br />Urban la'la llSl! ",!I'>e 50ulIWm Roc~y MaU'llll''lS, <br />f1l'af F'llsel, CQIorlldo (Phol09'ar>hbyJl"flroyB <br />B.l.,ls,US Ge<:>Io9ICi1ISU,,"I'Y,) <br /> <br />ga"'lllm<.: l."ompounJs (Sljuillal't' and <br />otl1t.rs. )I)Qfll. <br />Tctral.'hlurocthcn..: b pn..'"..:nl in <br />...()hen", fllr adhe"'l\es and is .11...0 a <br />by.pmduct of dry i.-leaning. Chlu- <br />rnfllnn can occur naltlrall~ or resul! <br />fnlfl\ till' chlorination or urinking <br />water. 1.1.1- Trit-Illonlethant' i... <br />pre...cnl in sol\'ellb and i.'leaillng <br />agt'nt.... 1.2A-Triruethyll'lt.'1I1t'ne ,.. <br />prt'...ent In pt'tmleum hY-PTlldul..h. <br /> <br />2;0 <br /> <br />Dichlorometh;ll1c I~ predominantly <br />used a... a sol\'ent in paint ...tnppers <br />and n:mo\'er.... C,)flccntrations of <br />dichloTl'melhanc and tdrachlnro- <br />elhene v. en..' greater than the <br />l'SEPA dnnklllg-water <.!andard of <br />5 ~glL ;It nnt. "'lte in Sil\'erthllme, <br /> <br />Totall'lIlililfm hach'fia \\l:n' <br />dl'h'l'll'd in ~ I pt'fl.l'lIt 01" 11)(' <br />gfound,nall'r ..ampll'" l.HlIl'cll'd <br />ill urhan ~ln'a'i. Tot<tll'(llifllrm <br />hacteria \\erl.' dl.,t.:ctl.'d only in ...alll- <br />pk... collected frollllhe ...hallow <br />monitt1ring well"> allu in nlme orthc <br />waler ...ample... from drinking-water <br />\\l.'lk Bal.'lena In grtlund waler <br />rna~ ('Cl..ur nallJrall~ 111 ...nib or Illay <br />tle rl'"iatt'd ttl human or anima] <br />v.asle and. therefore. may be '-In <br />mdlct!lPl!llf tht' ",anitary quality of <br />tht: walt'r l i\ly<..'r... and Sylw...ter. <br />19l)71. How<..'\i.'r. Ihl' pre...elKe of <br />tow I coliform hacteri" does nol <br />ne~e......ari]y indicate the pre...elH:e of <br />pn[enlially pathogl'nil.. hal.teria <br />"IKh a.... Eschcri/'hia ,'{l1i (E. coli J. <br />whll"h wa~ nlll dt'll.'~k'J in any (If <br />tht' ....unplt':-.. <br /> <br />" <br /> <br />Chlorofluorocarbons (CFCs) were used to determine the age <br />of ground water <br />Shallow ground water, which is u~J for drinking waler in part of Ih~ <br />Southern Rocky !\,,10untains, is genl.'rally young (less than 10 years old) <br />and i<; more susceptible to contamination as a result of land-use practices. <br />The age of the ground water refers to the lime from when the water <br />rechargeJ. or l'nll'red. the aquifer to the time it was withdrawn fromlhe <br />aquifer. The presence of contaminants. if any, in ground walt'r can refteel <br />land-use conditions at the time of recharge, The age of (he ground water <br />was detennined in five urban are.IS where water--quality samples were <br />collectt>d from shallow alluvial aquifers. The age of ground water at most <br />of the sites sampled ranged from 0 to 10 years old. Ground-\valer ages of <br />greater than 10 years were found in 7 of 25 wells. <br />In the samples \vhere CFC dates were obtained. four of the five nitrate <br />concentrations greater Lhan 2.0 mgIL were from recemly recharged <br />ground water (10 years or younger). This is an indication that current land <br />use may be affecting waler quality. Increasing urban development may <br />add nitrate lO the ground water from different sources, such as septic sys- <br />lems, applic3li(1ll of fertilizers, and domeslk animal waSles. Effects of <br />increa:<.ed urban dc\.elopment on ground-water resourc~s are not extensive <br />in the study area at preSl:nt. <br /> <br />10 \\',tler Qualll~ III tht' L.ppt'l Coloradtl Ri\er Basin <br />
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