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<br />COlIllC1u'9 ....ale. samp~s at an agrlC\j~u'al drill" on
<br />theGrandVall&y (Pholog'8PhbyNOfmanSpah,
<br />US GI'IOk>9'CaISu'Wli'.l
<br />
<br />I'l....lidtll... ~ l'n- l'umnlOnl~
<br /><It'll'elt'll ill :lgril"lIltural an'w. uf"
<br />thl'l'COl..hull'OIH."I'lltr;.ltiolls
<br />\\l'f"l" gt'llt'nlll) In". .\10\1 pl'slicuk
<br />detel:tilJnS in ...url":I...(' WalC'f W('Te-
<br />nol at cI111centration.. of concern
<br />Fn:..hwatt'f aqualit.~lIfL' guideline....
<br />\Wfl" t'xl,.'\.'edt'J o....cblonally: h{lW~
<br />(,H'T. guideline:, haw not ncl'n
<br />l'~t;lhli...I1t'J fix all l,:nmpoulllh.
<br />Only:; of th(' yo \ampk:-. Cl,Ilt'I'h,'d
<br />JI1 11ll' agricuhur;11 arl'a... clllHailll'J
<br />1X'\1il'id<..... lhal t:\..:l..lxkJ ('\Iab-
<br />li..hed g-uidc-llllt.... TIlt' (lL,..,ticide"
<br />thaln..:t'edl'd guiJl.'line' I'm rro-
<br />lc'.::tillll of fn.....hwall.r '-ll./uatk lift'
<br />art' <l7inpho..-melhyl. I of ~-+ ...am-
<br />ple:-> al Reed \\"a...l1: \'.arbar: l. ~ ..) n-
<br />nptk .;;ilt'\. Indian \\'a...h and
<br />Orchard \k~a Drain in tht' Grand
<br />\'alky: dialilwn. I "ynnptic ,-ite.
<br />Indian \\'~hh: diuh1n. I ...y nnptu:
<br />"TIe. Indi;1Il \\",I"h: and glllllmll-
<br />HClI. I 'y n\lplK ..ite. Ihl' dram at
<br />Blll:''-OIll R(lad Illlhl' LTnl.(llllpahgre
<br />\'alh.'y.
<br />
<br />Pl,..tiddc dl'll'l.tioll," and l"tlll-
<br />t'cntr:.llion.. ..IUl\\l'd "cOl"oflal pat-
<br />h'rn... PenoJil' ".J.ll1plinj:: al t\\\l
<br />
<br />agncuhural ..tn.'am.. ..howl.."d Ihat
<br />the total numbl'r of pe'i1iciJI.'''
<br />detected wa.. grcate..t during- Apnl
<br />Ihrough AUf'mt l Bauch and Spahr.
<br />2000J. Pc,(Jcidc detecllon.. pl.'f
<br />mOlllh for Dr: Crt'ek arc ,h\lwn m
<br />tigurc 13. Concelllratlnn.. of :j[fa-
<br />llll.... were founJ tll he greater fmm
<br />\Iay Ihrough Augu,t than Juring
<br />other penod.., of the year /tig. IJJ.
<br />The ..ca"nnal pallern of ConCl.'nlra-
<br />[Ton.., wa.. ."imilar for (llhcr pl.'..tl-
<br />l.idl.'''' and rdk'ct.., thc growing
<br />"'t'a,on f\)r Ihe Grand anJ
<br />L'nwmpahgre \'alky'".
<br />Pt,..til,'idc,,,, \\ l'n' dl'll'l'll'd ill ..W
<br />HI" -IJ <lgrirullural..trl';lIU",
<br />Thlny-ollc JX'..,ticide.. (2] hl'rhl-
<br />ddc.. and 10 lll...ectlcide.,l werc
<br />detcl.:lcd at lea..1 011':1.' during a ;..lay
<br />[l}l.)R agricultural ..,tn:am ...ynoptic
<br />"'Iudy in (he Grand \'alk~. and
<br />Uncompahgre Valley an~a" Alr~l-
<br />lIne and alachl\lr werl' detet.(t'd in
<br />morc Ihan 50 pcrn~nt of tht' ..am-
<br />pit',. Concentration, of :Itralinl' diLl
<br />[W{ e'xcel.'d aquati....-lifc guideline...
<br />Guiddme.., are not ;l\~lIlahk' for
<br />alachl\lf.
<br />SOIlIt' ill~l'l.tiddl'" haH' Ilt'r-
<br />..i..,h.d in sln'aml1l'd .'-l'diml'nl ~lIld
<br />li..,h Ih..,Ul', .dthuuJ!h t1lt'ir lI'll' ha..
<br />hl'l'll hanlll'd or n'~lrkh'd. DOT
<br />W;1, harull'd in 1972. hut DOT nr it..
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<br />Agrro::ullu'l.'andthI.'SanJu.lI'IMounla,ns'll.'a'
<br />MQ-fll'OSe (Pholog'arh by NOrma'l Spah'
<br />U S G&O~~a: Su","ey.,
<br />
<br />brcakdown pmducl... DDE and
<br />ODD. \\ ere deh.xled III ..,tfi.'amPeJ
<br />~edllnenh;1( ti\'e of Ihe six Jgricul-
<br />tural ..ires ...amplcd and in ti,h tj,-
<br />..,ue ~lt all three of {he a~ricullUral
<br />,ill." \~ here li,h {I...,UC ,ample,
<br />werc culkcled (Stephcm and
<br />De<lc\H1. 1991\), Clllleentrations of
<br />DDT and DDE in "lreal11hl'd ,edi-
<br />lllCn! at 1\\'(1 ..,][c.., c\ceeded tht.'
<br />Can.ldian St'lhlllt'rH Quality Guide-
<br />lllle.., PEL ICanadian Cnuncilllf
<br />\Iiniql.'r" \)1" Iht' EnvironmCllt.
<br />I lJ\)4 I. .I'he DDI) C\lllcclltration al
<br />Olll' ,]tt' l'\ct't"JeJ Ihl' PEL. Dield-
<br />rin/a rt.'.;.trll"il'J Lhl.' ill...ectieide
<br />..,il1l...e ] 47..J \ wa, LlelecleJ III ."Ircam-
<br />hcd ..,ediment... at t\\'o of Ihe ,ix
<br />..ill'.. and in lh.h tL""Ut' al all three
<br />"'lte... hhl"l,,'licide.. detCl.ted Itl ti,h
<br />ti""Ul' and ..,lrt',Uulk'd ...edimt.'llh
<br />were generally nul dl'lecll.'d in
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<br />Figure 13. The number 01 pesticide detections and median alrazrne
<br />concentrallons In surface water are greater dunng the spring and summer
<br />mOnlhS, Atrazlne is commonly used for season-long weed control In corn.
<br />
<br />](1 Wata Qualil~ In the Lirpc-r Clltoradll River B:l..Jn
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