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<br />Increasing or decreasing surface lU'ea lUlU, evapelration' frGil!J: wat~lJo4iesw~iliia\le''\Vat!!rrightsiRtt1>~a,tililiJS. ,
<br />- Itisexpe(jtedtha.tthe graveLpit~ w<iluld'lJedeoreased inarea,as'~h'~"are matfe,Sh:~wer w~tJildinex~aSew ,',' ',' , '
<br />.hordJine.Tfiis decrease inareaw0uldcotn;pensatelor increas'\!dlW'atet e~tJSe1ilinth:e(l)~tlw~dime.ll\~'Vate4
<br />wetlands. Ifthese,qua:ntities do not balance the water right meeds,the City is prepareato cl!uisidep1iismg'exMing
<br />water rights to make up anylosses.
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<br />A utHity corridor Gotitaiming angu ,gas Jih:e,24uwatedineand~1'fli!licServit;e ofCcilorado,elecbricline1$iseelthe
<br />Kingfisher site, fro:o;1northtli\ SGlIth. . Tkese .1ItiHties. are.atd'epth~1Je:l:We~4iliJd .f0'feet'lUldcQttldre:"J:\ilit~lil
<br />loweringi:fthe two northponus were CQI111e6te1l' or if signilliiearltm'0dieficati(l~s were made to thetUp:jJ~lfpliiyof
<br />the King.fisher and "N<ilflh Lime DepositsU sites. Such actionis'not alltiei'patcodat thisfune. ' '
<br />
<br />Relati61f$')jipof tbePtoposedJh1ojectto'OtberPtQ~~cts o'rPl'i\'D.s. T1teCify 0fF<ilrtCoflins naturliLareasites
<br />(Cattail Chorus, NixaignaH, 'RiverbendPo~~)andthePoutlFeRiverbol1ndt!ieI<1)xgfisherPointNa~ailNl1ea.
<br />Kingfisher Point NaturalArea isthegeO;graphicand~cti\!)iJalt~:F,Eu1)" ili the center ot:this comp1el!\ o'f.n,otdi'iags.
<br />'InteJ;pre:tatioR an~<\)Jpreclatii:mof G;~ttaili(;)lYorqsNat(U7al'Aj;ea'is:pil1s~t~r01'fFQ:o;1 tFte,J0u~Rshet, site." ' "
<br />Modificafion,offue Kingfisher sitecouldcreate observationml!J~astopr(;jvide'all'oveMew ortlles1.l1'tG1U!l'ding
<br />natunilareas.Be,causeoflts i!Ji'sltJ.l7bed couilitiol).,theKiJ;l:gfisltetstfecanbe seen as "plastic",mo'fe amen,lt1i>leto
<br />moilii:icati0n, wHile, adjacent areassuchas'Riverben,dPdnds an:iJ,'~att'<ti:IChomsare less atla'Pta9'1eor~ec~ptable
<br />tomQditicati:<iln. 'Fhe managemeutal1ttpotentialreo1amati0nof~hgRsher Point NatUral Mea e0uli:MI,w.vean:
<br />effect en all of these adjacent naltJ.l7al atells inthe follewttigways:a\!lcess,;'l1a"bitatcontigultyandWil~IWe
<br />movem~nt,river hydrology,gtoundwaterhydrcilogy. AnyJ0ugtisnet Pdintip'tojectwoutdneed to ~e
<br />negative impacts on these adjacentnaltJ.l7al areas.' .
<br />
<br />Study Methodcdogies. '
<br />.tlilllentIHydvIlU!iCS. Site visits and data searches wi.llbe usedte determine the sedi:ment yieldlUld .
<br />characteristics of the basin. Existing and new topographydata were used te constructflo0t1. plainhydrau1ic
<br />models (HEC-2/HEC-RAS); IUldstablechannelmodids (SAM, etc.). ThesemtJdels wi.llbe usedtodevel0li the
<br />data to GOlJ1pare alternatives, and to deve10p the detailed design o.t''the selected alternative. Constructieh
<br />quantity estimates will be developed for all alternatives.
<br />
<br />Hydrology. Piezometers and staff gages have been instailledto docUUlent the connection between pond levels
<br />andgroundwaterlevels.Water rights impacts of increasing or decreasing surface areaofwaterwillbe
<br />quantified. Stage frequency for the river and oxbowwillbeprovided. Drainage options from the pon~sIaave
<br />been defined and connecting pipes have been sized.
<br />
<br />Geotech. Existing boring data was not adequate as anticipated, so new borings Were made. That data, ,.pIJls, new
<br />piezometer boring logs, and plannedsoiltrenchiug willbeused todetermiue gtoundwater conductivity, lilJ1c
<br />waste depths in planned excavation sites, fill material qua1itYlllJ.(Kavailability, and top'soilavail'<ttiility. I nOW
<br />appears special studies will not be done to determine soil amendments sufficient toeuab1e native plants t<il grow
<br />on top of deep lime waste deposits. Instead the assUUlption is a2-ftcap of topsoil over the lime. '
<br />
<br />Surveys. Existing surveys include 2-ftcontour intervaltoPQgraphic GIS. A:dditional surveys are'lYlanned fOr
<br />gravel pond bottoms and river structure locations, and have been taken for the tiver,channel Bottom.
<br />
<br />Coustructibilify. The study did address possibilities for reuse, removal, or modification ofthe lirne waste
<br />contained on site; nnsuccessfully. We are planning to dispose any excavated lime waste on-site, over ether1ime
<br />... asfiU for shallowing the gravel pits, to be, covered with clean, productive soil. Constructibilify reView will
<br />'me later.
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<br />L:\Sectlon FolderslSECA\Board Meetlngs\September 2002IAgenda item 19.Corps report attachement.doc
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<br />09/03/2002 PM
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