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<br /> <br />USBR/MWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />w <br />CJl <br />c.o <br />W <br /> <br />Hydrologically driven short-term salinity increases in the Sacramento - San Joaquin Delta are <br />unavoidable. During drought periods, seawater intrusion in the Delta due to tidal actioIfI" <br />significantly increases TDS, including chloride levels (see Figure 2-14, and 2-15). Tidal flOW. '. <br />also bring in bromide, which may be transformed into bromate when treated at a water I, <br />filtration plant with ozone. Bromate is an undesirable disinfection by-product to be regulated ~'" <br />beginning November 1998. Studies show that depending upon future bromate regulations and <br />water treatment measures needed at Metropolitan filtration plants to mitigate bromate <br />formation, water treatment processes could add 30 to 90 mgIL of TDS to Metropolitan's <br />treated water. In comparison, present TDS contributions from filtration plant processes are <br />less than 10 mg/L. <br /> <br />Reservoir management, groundwater wheeling and storm water inflows change the salinity of <br />SWP water between the Banks Pumping Plant at the Delta and Metropolitan's point of <br />delivery on the East Branch at the Devil Canyon Afterbay as illustrated in Figure 2-16. <br /> <br />Figure 2-14 <br /> <br />CHLORIDE INTRUSION INTO THE PELlA <br />1944 " 1990 <br /> <br />. ~.'"'" <br />.....,,:, <br />011.....'. <br /> <br />" . k <br />f!; "" ~, "'00" ~8! <br />S -J""~'~\, <br />M''''} '''\\ <br /><, \.<8 <br />'":W"fIW''''~''''<<<O:'l\'W8W"p' <br />l t, <br />$WP'.I:~;!~8'<"\'_< <br />~i1$' ~~: e <br /><~.C ., <br />,""",,,, ft. <br />,. <br />.' <br /> <br />lines represent 1 ,000 mg/l of chloride tnePsured 11/2 hoursoflernigh tide. <br />Chloridel&vels in woterinCreasell cluringdroughtyears. Data obtained from <br />Stole Waler Resources Control Bocm:land Department of Water Resources. <br /> <br />BOOKMAN-EDMONSTON Section 2 <br />ENGINEERING, INC. 2-14 Salinity Problems, Impacts, & Technology <br />O:\LOCALRES\ANDYS\SALINITY\JUNE98-2\6SECTI,DQC Last printed 07120/98 10:17 AM <br /> <br />e <br /> <br /> <br /> <br /> <br /> <br />e <br /> <br />. <br />