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<br />.;:~'~::::' . 'c.; >...;,:.,,:,to. theSouthPl atte River or its tributari es. I~hat are the nutrient' ::, ,;:,
<br />.,:,;,::::":.:'-":...::~:...,,:::loadingrates,from,non-polnt'sources in the area, notably the irrigation ,',,'.
<br />:/\>?)::;:i.',<return flows. Hhat are the "other similar improvements'.' (page IV~16) "',"':J
<br />\ '. '.':',:",.,.':::'''C,.,< befng made to improve the water quality of the South Platte River;:, and ' .', .::,.'
<br />. ,,;~,},:,,:,>:::,: how would they impact the Narrows Reservofr? (For the record, the .:: "';',':
<br />.<~,;'::'\::,'-;:. ..'.,Gree1eywastewater treatment facility does not intercept or treat the' ,:,',:;-..'::
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<br />,r:~F~~2':~'~/;;:'i:;;7~":,t~r\~~:~,~:~ -r~~dl.Cl~:~f,f:~uent~:~,> '.:....,', '.".'. ',,:i:.': /:;:,:;;:,: :,,:;.<,~' !M?;;::':::o~h(;~;;~:
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<br />> <'~.:'t>:;:~"',,::~~>;','.5)The EISindicates (pageIII-46)tha~ no substantial 'qulm':,::,:'\,:.'.\c)/'
<br />{;',~~::,t:"~~':";i".:,tities'"of' pestfcides were noted In the 'South 'P1atte River, between ,:~,':"" .<)>.:,
<br />'::.{""'\;:;:'~::..:.;~~KerseyandtheCol orado~lIebraskastateborder during 1973 and J974~::,' :<>:;,',
<br />::~~;~"-:"i::+:~::"::?iSpecif1c' data on ''the kinas.'and concentrations of. pestfcides should' '.' ,..,:::.,<:,'~',
<br />;j'~';;::::';~":\>;,{bereported. caswell 'as' otherpestiddesinformation from other data ":;;':~:'
<br />t:'~~:','~-{~':;,;':i::'i:,; sources. " Once identified, the probable fate of these pesti cfdes in . .:', ;:,:':1
<br />:~'/';:.~'.;,>~'::,,> ,;thereservoir should beaddressed,.fncluding res~dlle accumu1ation..1n, ,~/~':::;i:,.
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<br />i '~;~W<:;:~.:;.'.:;:;:',:'::~~:.,~~se~'Y~~t ,~~di~~:~t~.; ';; >:,cj:'., .;>.,<,,:? <~;:~?":/: ':;,:i~''':;(.~:f'?:,~:;>2
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<br />i ':';L:;+;">.,~:;::\':..:<i:-:'6) . Current bacterfo10gica1data for'the reach of river under:~:': '.'';'?<
<br />..;;::,:>::'''':S;:::study should be.. obtafnedin order to, judge possfb1e' incompatibilities '.~;.~~i,'~
<br />'1 /Y: :',' c' ';""",.wi ththe ;useof the proposed reservoir for body-contact .recreati on'; " . ,",; : ,::>,<
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<br /><;;:,f:'.:,.~:,,::.\\..,:.,,;~~.t'l)::."EPAdoe's. not consider'the fnformiltion and data presented :in ", -'.,"';:'
<br />::::,,;;\,;;:';:/.:::,~,_~,:the EIS to be. supportive of the.'conc1usion that impoundment eutrophication ",":"
<br />':::~;,:.:>.\.,;:::,\t:>,wn1.l)ot.be.aprob1em impacting multIple uses: 'To the contrary, from ,'<,,:
<br />. .:;t,"':"',",:'\;,,;:the'fnformation presented.. it would' be EPA's pre11mlnary Judgementthat.':,,:"
<br />, '';.:','<~,~,,:~,:-.'1j;,<>the .potential for accelerated eutrophication does exist. Tile nitrate..,>:.I,
<br />:.;:'~}/,,'~\",t::::7:;~levels (actual.1y:nftrogen should bl:! gfven as total nitrogen. not just '0',:-::
<br />;:'::~;:~':':"'..:-:-:::~" :~.nitr'ate-nitrogenas"other forms of aqueous-based 'nftrogen may act as'.; .:"" "~.': .
<br />.S,i;;.",,~'}':.":: :a'nutrfent: supply)are"notgrowth-llmitfng,the biologically available' ,....
<br />, ,:1,0;,1:,:\7),:.'::,2 (:orthophosphatei smost :certai n 1y not growth limitf ng andpotassi um 1 eye 1 s.-,:~;
<br />. .;;>f~~'<"',:.:"" .'appear adequate. However;more data on these and other nutrients:.fs,' ..'.:;"-";'.<
<br />>J~-,.;'-;.:-;:'... . needed. '(A, conservative vfew of many EPA biologists is that prevention, '.<\;:::
<br />i'~~:,,,,~,,,;:,;,,,,:';.:'':'.,:of bfologfca1' nui sance,:conditions . requires a total. phosphorous con-'. ..,....,,:;. ~'.:..>'
<br />;;:.;:;:,~;,,";:~:O:,:}>?centration of <50ug/1at ,anY pofnt within af1,ow{ng stream and < 50U9/1'.'~,'
<br />',,!t:S~::::,;:~0;:;:;::~;wher~;f1 ow.ing waters enter ~ lake" reservoir or. other standJngwater::..::.?:<i:~~t
<br />~~~?if;;~;,:tEody ;-\-Qbvf ou~ 1y l.the Sou~h '. Pl ~.tte' B i yer , ups tream . of ,the. proposed're::,i'.i;;;:;;:;:;.;i~
<br />""...,:':.,,::;..servoir 10catlon does notmeet,such.crtterfa and possibly never will.) , ":-"1
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<br />:;}~:'.;-> ,':':'..;<,:::eutrophicationat the. present time, no site specific data'.,on' ;these':re-,';:,::'::;",;>J
<br />~;Y/S :>'" t "servoirs is given;' Ifcompari sons bebreen these exi sting 'reservoifs .:::'7,::,.'~::'>1
<br />',:'S;:'7,::':~~"';'.and:the proposed Narrows Reservoir are to .be made,.data relative:..to..,.~~_>>7;"~:.
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