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<br />. <br /> <br />. <br /> <br />. <br /> <br />o <br />~ <br />tv <br />"'-I <br /> <br />CHAPTER 11 NEED FOR ACTION <br /> <br />measurements taken along stretches of the river where no seeps were <br /> <br />observed showed no increase in salinity. Based on all available data, <br /> <br />27 ds is the estimated long-term total average annual flow of all <br /> <br />saline springs and seeps along the river with an average concentration <br /> <br />of about 4,400 mg/L with a salt load of about 116,000 tons per year. <br /> <br />Further verification of the inflows and salt loading along this reach <br /> <br />will be made as results of continuous conductivity and flow measurements <br /> <br />become available. <br /> <br />Geology <br /> <br />The Laney Shale and Wilkins Peak Members of the Green River <br /> <br />Formation and members of the Wasatch Formation contain the aquifers <br /> <br />related to the Big Sandy River Unit salinity problem. The Laney Shale <br /> <br />consists of fine- to medium-grained sandstone; massive to laminated <br /> <br />marlstone, oil shale, tuff, and siltstone and is of freshwater, <br /> <br />lacustrine origin. <br /> <br />Numerous vertical joints in the shale are filled <br /> <br />with a soluble material, probably gypsum or anhydrite, which contribute <br /> <br />calcium and sulfate to the ground water. <br /> <br />The Wilkins Peak Member is <br /> <br />principally oil shale with minor beds of marls tone, siltstone, algal <br /> <br />limestone, and tuff and is of saline water, lacustrine origin. The <br /> <br />Wilkins Peak Member contains saline beds composed of trona, shortite, <br /> <br />and halite. The Wasatch Formation contains a deep artesian, relatively <br /> <br />freshwater aquifer. <br /> <br />Several northeast-trending lineamentsl attributable to a shear zone <br /> <br />cross through the southern part of the unit area. High transmissivities <br /> <br />LLineaments are linear topographic features or unexplained lines <br />visible on aerial photographs. <br /> <br />30 <br />