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<br /> <br />v !J.Q; J <br /> <br /> <br />to achieve stable operatIon over.a perIod of tIme and would be comfortable <br />with sldestream softenIng for future plant designs. Nevertheless, a learning <br />perIod would .be anticIpated In the use of sldestream softenIng at JIm BrIdger <br />and pi lot testIng would be advisable to determIne the Impacts on the <br />cIrculatIng water systems and the FGD systems, as wel I as the economIcs of <br />sldestream softener operation. <br /> <br />The rate of use of Big Sandy River Unit water would be affected by changes In <br />water qual ity, varIations In plant load, demand from the scrubbers and other <br />factors. Because the BIg Sandy River UnIt wel I fIelds are not fully <br />developed, the water chemIstrIes used In the study may not be fully <br />representatIve of the final collectIon and dIstribution system. The effects <br />of water chemIstry changes on the cost of the sldestream softening process <br />were examIned and are discussed In the report. The effect of variations In <br />plant load on Big Sandy water use In the plant are shown graphically on FIgure <br />ES-4, and Include overall BIg Sandy flow, coolIng tower blowdown flow and <br />sldestream softener feed flow. <br /> <br />Fol lowIng the selectIon of the fInal process confIguratIon, modIfIcations to <br />the Jim BrIdger Plant were IdentIfied on an appraIsal level basIs. In this <br />concept, sa II ne water wou I d be co I I ected at the BIg Sandy we I I fie I d near <br />Farson, Wyoming and transported via a pipelIne to a fIve million gallon <br />storage basin at the Jim Bridger Plant. Big Sandy and Green RIver water would <br />be combined In the storage basIn and dIstributed to each of the four coolIng <br />towers based on their IndIvIdual demand. The quantity of Big Sandy water <br />would be control led to meet the quantity and qualIty requirements of the <br />coo I I ng towers. . <br /> <br />A s I destream from each coo II ng tower c I rcu J atl ng water system wou I d be <br />collected In a one million gallon sldestream surge basin. The quantIty of <br />sldestream flow would be regulated to maIntain circulating water chemistry <br />lImIts. The sldestreams from the four coolIng towers would be blended In the <br />sldestream surge basIn and then be pumped to two 600 gpm softeners operatIng <br />In paral lei. Lime and .soda liquor would be added. The softened effluent <br />would dIscharge to a one mIllion gallon acIdifIcatIon basin where sulfuric <br />acid would be added. The water from the acidifIcation basIn would be <br />proportioned back to the coolIng towers based on theIr IndIvidual demands. <br /> <br />The basIns and circulatIng water lines of the four cooling towers would be <br />lined for sulfate protection. ApproxImately 65 acres of additIonal lined <br />sludge pond area would be requIred for softener sludge disposal. The sludge <br />ponds would be Incorporated Into the exIsting plan for expanded scrubber <br />sludge dlsposa I. <br /> <br />The ponds and softener system would be located In the area east of CoolIng <br />Towers 1, 2 and 3. The area requIrements for the ponds, equIpment and access <br />would be approximately 3.5 acres. The general arrangement for the conceptual <br />Installation Is shown on Figure ES-5. <br /> <br /> <br />E$-7 <br />