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<br />-6- <br /> <br />The Pro,;ect will supply annually ~2,lOO acre-feet of irrioatioil <br />\later for 28,270 acres. Of this total, 7,430 acres vlill be neVi lands <br />and \1ill receive il full surr1y while the renaininn 20,e40 ac"es of <br />presently irriqated lands I,lill receive a supp1er,ilmta1 supply. i\ total <br />of l,aaa acre-feet vlill be nrovid(!d for nunicipa1 and industrial uses <br />and 3,600 acre-feet for use at tile Cedaredqe fish hatcher". The Uoper <br />Surface Creek '1alley lJater Users Association has requested 1800 acre- <br />feet per year of Project \later from Cactus Park Reservoir for rlUlli- <br />cipa1 and industrial uses. Slnce the reservoir is expected to <br />exnerience heavy recreational use, the Association will need to provide <br />cOi"m1ete treatment for the water to insure a safe supply. This Hou1d <br />be in accord vlith an8,merican ,later ;'Iorks Association oolicv \lhich <br />states, "\1ilter withdravlI1 from Multipurpose reservoirs for domestic <br />vlater supply purposes shall be niven the saMe COMplete treatMent as <br />those waters derived fro", oolluted sources," If the reservoir has <br />heavy motor boat usane, the treatment of the l'/ater vlou1d be further <br />corm1icated due to fuel and oil 1eakal1c. <br /> <br />POLLUTION SOURCES <br /> <br />Increased salinity (total dissolved solidS) of the lovler Colorado <br />Piver IIi 11 be the major water quality problem resultinn frorl develorJ- <br />rlent of the Pro.;ect. Irrioiltion is the activity of rlan that contributes <br />rlost to the increase of salinity concentrations. TvlO factors associated <br />with irriqiltion cause this increase. First, \1ater is lost by eva[1o,'ation <br />and eva[1otranspiration with no accompanyinl1 loss of salt, tilCreby caus- <br />inn salinity concentrations to increase. Secondly, the pickuo of salts <br />frorl i rri Qil ted 1 ands in excess of quan ti ti es requi red for ma i nta i ni nq <br />a salt balance.!! causes an increase in salinity. <br /> <br />From (Tenera1 analysis of the project area, it is estimated that <br />nmi lands will contribute tvlO tons of salt per acre or a total of 14,8GO <br />tons annually. It is be1ievcd that sun[11ementa1 service lands have been <br />leached free of all but Millor amounts of soluble salts and \'Iill add only <br />a small undetenninab1e aMount of salt load to the river system. The rate <br />of saH pickup by irriqation is still 1arQe1y an unknown factor and the <br />estirlilt(lS May chanoe \,lith additional detailed investiqations. :1. V. <br />IOrlls\41 estlmated that rlunicipill vlater use vlil1 add about 100 tons <br />of salt ilnnually oer 1,000 oO[lu1ation. Thus, v/ith a nro,iected [1opu- <br />1ation increase of 1,950 in the Project area by 2010, 195 tons of salt <br />\'Ii 11 br. added annually to the ri ver sys tem. <br /> <br />The dOrles ti c vias tes in the Project area are prescnt1v treated <br />nrimilrilv bv individual sentic tilnk facilities. The scptic tanks \lork <br />e"'fective1v in the Project area and l'Iill not have a sionificant effect <br />on thc l'later qUil1ity of the river systems. <br /> <br />1/ <br /> <br />Sa1 t ba1 ance is clefi ncd as the removal of a quanti ty of sa1 t equal <br />to that applied in the irril1ation water. <br />