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<br />USBRIMWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />. <br /> <br />Groundwater sources experience increased TDS due to agricultural and urban activities and <br />groundwater overdraft. Without an ocean outfall or stream discharge, inland areas that reuse <br />wastewater encounter a build-up of salt in groundwater (see Figure 2-2) as salt continues to <br />accumulate without being removed. Some inland agencies have access to brine lines to export <br />salt and concentrated wastes to a coastal treatment plant and ocean outfall. Other agencies <br />have not found construction of a brine line to be economically feasible to date. In previous <br />years, groundwater overdraft along the coastline has led to seawater intrusion into coastal <br />groundwater basins and impaired quality of freshwater aquifers. <br /> <br />w <br />CJl <br />00 <br />N <br /> <br />Figure 2-2 <br /> <br />Salt Balance <br /> <br />. <br /> <br /> <br />Dhdw';-\ <br />!liver <br />-"1'90-\, <br /> <br />~... <br />kilo ... :l: <br />O<<o..n <br />\ <br /> <br />. <br /> <br />The long-term salt imbalance of Southern California is an important management problem. <br />Smaller basins like the Arlington and Mission groundwater basins in Riverside and San Diego <br />counties, respectively, were abandoned for municipal supply years ago because of high salinity <br />levels. Only recently, have these basins been restored to use through construction of <br />expensive demineralization projects. The larger groundwater basins, by virtue of their storage <br />capacity and geographic extent, function as "shock absorbers" when droughts cause TDS to <br />increase in imported supplies. There is general acceptance that even large basins are <br />experiencing progressive salt buildup despite the extensive regulatory and management <br /> <br />BOOKMAN-EDMONSTON Section 2 <br />ENGINEERING, INC. 2-3 Salinity Problems, Impacts, & Technology <br />O:\LOCALRES\ANDYS\SALINITY\JUNE98-2\6SECT2.DOC Last printed 07/20/98 10: 17 AM <br /> <br /> <br /> <br /> <br /> <br /> <br />~ {, <br />