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LGOeOG 90 EXECUTIVE SUMMARY This report presents the results of Task 2 of Bureau of ReclamatIon Contract 4-AB-81-03600 which Involves the study of saline water use at selected power plants located In the Colorado RIver BasIn. The Task 1 study addressed salIne water use and assocIated coolIng water and wastewater management technologIes at the Hunter StatIon In Utah. The purpose of the Task 2 study was to evaluate the use of saline water from the BIg Sandy River UnIt as a partial raw water supply to the Jim Bridger Power plant located In southwestern WyomIng. The Big Sandy RIver UnIt Is under study by the Bureau of Reclamation as a potentIal control source for 167,000 tons of salt which flows annually Into the Colorado RIver system via the Green River. The objectIves of.the Task 2 study Included the technIcal and economIc evaluation of process optIons for salIne water use, the determination of comparative Incremental costs for salt removal and the selection of the most cost effective process desIgn for the Jim BrIdger Plant. The study scope Included only modIfIcations wIthin the existIng plant boundarIes. The Bureau of Reclamation will conduct a separate evaluation of the cost of collectIon and transport of BIg Sandy RIver Unit water from the wel I field to the JIm Bridger Plant. Thus by determInIng the collectIon. transport, use and dIsposal costs for beneficIal use of BIg Sandy RIver Unit water, the Bureau of ReclamatIon can make cost-eff~ctlve selectIons from alternative plans to meet program salt removal obJectIves. JIm BrIdger Plant flow, chemistry and equIpment data were obtaIned through a site vIsit to the plant at Point of Rocks, WyomIng In September, 1984. TechnIcal and economic factors were coordInated wIth PacifIc Power and light Company. Based on PacIfIc Power and lIght's plans to complete the I nsta I I at Ion of scrubbers for su I fur d lox I de control for a I I un Its by 1990, a reference plant water system confIguratIon was developed to reflect the 1990 conditions. In this confIguratIon, the station wI II meet zero dIscharge requ I rements through the use of coo II ng tower b lowdown for scrubber makeup and fInal dIsposal In an exIstIng 500 acre evaporatIon pond and In expanded scrubber sludge ponds. Fol lowIng the characterIzatIon of the 1990 plant water system configuratIon and the BIg Sandy River Unit water supply, salIne water technology alternatives were Identified and screened. Because the JIm BrIdger Plant wI II have adequate wastewater disposal capabl I Ity to meet zero dIscharge under the 1990 configuration, many saline water use alternatives, such as desalting processes, were not applicable. The screenIng IdentIfIed lime/soda softenIng processes as havIng the best potentIal for cost effectIve commercially proven process desIgns. From the results of the technology screenIng, three InItIal process optIons were developed for comparIson. OptIon I represented the JIm BrIdger Plant water system In the 1990 configuration wIthout modIfIcations for Big Sandy water use. OptIon I I used conventIonal lIme/soda softenIng of the Big Sandy makeup water before It was blended wIth Green RIver Water for makeup to the plant's four coolIng towers. OptIon I II used blended BIg Sandy water and Green RIver water as cooling tower makeup, and appl led sldestream lime/soda soften I ng for contro I I I ng the c I rcu I at I ng water chem I stry of a I I four coo I I ng towers. Process evaluations were performed to compare OptIon I wIth Options II and II I for BIg Sandy flows of 7,500, 5,000 and 2,500 gpm. The results of E5-1