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<br />USBR/MWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />w <br />en <br />~,"" <br />w <br /> <br />1. Maintaining blending costs within $10 million before returning to the Board for <br />additional authorization, <br />2. There being sufficient SWP water available for blending, and <br />3. Compliance with all primary water quality standards. <br /> <br />Additional short-term factors that occasionally limit the ability to meet the TDS target include <br />flow adjustments to deal with episodes of turbidity and algae blooms, sudden demand <br />changes, and unexpected changes in SWP salinity. SWP salinity has changed as much as <br />200 mg/L within one year. The 1998 plan provides a good framework for a long-term salinity <br />management policy, i.e. pursuit of common numeric TDS targets for the three plants over a <br />specified period, contingent upon budget, availability of SWP water and compliance with all <br />water quality standards. <br /> <br />The three plants, Weymouth, Skinner and Diemer can be managed to provide consistent <br />salinity within distribution system constraints. The plot of historical salinity concentrations in <br />Figure 3-4 shows consistent effluent salinity levels. <br /> <br />Figure 3-4 <br /> <br />Annual Average TOS in Filtration <br />Plants <br /> <br /> <br />r# <br />r# <br />fJ,,' <br />'Itp, "" <br />~ ~~ <br />,f #.f Iff III;; <br />.1.llj~E1 <br />FlsCIlI Yesr 0; t3 II' , <br /> <br />800 <br />500 <br />- 400 ~ <br />- <br />300 i <br />200 - <br />100 <br /> <br />WeYmoUth <br /> <br />SkInner <br /> <br />f> <br />-.c <br /> <br />All averages are flow weighted. <br /> <br />BOOKMAN-EDMONSTON <br />ENGINEERING, INC. 3-8 <br />O:ILOCALRESIANDYSISAUNITYUUNE98-217SECT3.DOC 0712019810:59 AM <br /> <br />Section 3 <br />Evaluation of Potential Regional <br />Salinity Management Strategies <br /> <br />. <br /> <br /> <br /> <br /> <br /> <br /> <br />. <br /> <br />. <br />