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<br />USBRIMWD SALINITY MANAGEMENT STUDY <br />FINAL REPORT <br /> <br />. <br /> <br />BLENDING COSTS <br />Metropolitan incurs costs to blend when it takes extra SWP water from the East Branch to' <br />lower salinity, instead of taking maximum supplies from the CRA. Metropolitans lowest cost <br />water is from the CRA. The second lowest cost water is from the West Branch of the SWP at <br />Castaic Lake. The most expensive water is delivered through the East Branch of the SWP, <br />which is also the source needed for blending. The East Branch costs are higher because more <br />energy is needed for higher pump lifts to the delivery point in Metropolitans distribution <br />system, and because the SWP energy contracts are more costly than those for the CRA. <br />Table 3-2 lists projected energy costs. These projections are based on current forecasts and <br />an average 3 percent inflation per year. The future values may change due to the expiration of <br />some major SWP power contracts in the year 2004, changes in power prices with electric <br />restructuring, and/or changes in water supply conditions. <br /> <br />w <br />en <br />~--' <br />CD <br /> <br />Table 3-2 <br /> <br /> <br />Water Source <br /> <br />. <br /> <br />eRA <br />West Branch of SWP <br />East Branch of SWP <br /> <br />75 <br /> <br />70 <br />87 <br /> <br />57 <br />71 <br /> <br />The cost of shifting water deliveries to the East Branch of the SWP from either the West <br />Branch or the CRA is the difference in marginal costs. Metropolitans expenses for power <br />have changed significantly over the last few years in response to new contracts and market <br />forces. Future changes in the power market are uncertain and likely to be volatile. <br /> <br />Under projected year 2000 supply and member agency demand conditions, up to about a <br />10 percent blend can be achieved by shifting water from the West Branch to the East Branch <br />at a differential cost of $15/AF ($75 - $60). Further blending is achieved by reducing the <br />amount of CRA water and replacing it with additional East Branch water at a differential cost <br />of $36/AF ($75 - $39). An additional cost of about $5/AF is incurred at filtration plants for <br />the extra chemical usage and the sludge removal associated with treating SWP rather than <br />CRA water. The costs and resource impacts to achieve a 500 mgIL salinity target in the year <br />2000 are illustrated in Figures 3-7 and 3-8. <br /> <br />. <br /> <br />BOOKMAN-EDMONSTON <br />ENGINEERING, INC. 3-11 <br />O:ILOCAlRESVlNDYSISAUN/TY\JUNE98.217SECT3.DOC 07/20/9810:59 AM <br /> <br />Section 3 <br />Evaluation o/Potential Regional <br />Salinity Management Strategies <br /> <br /> <br /> <br /> <br /> <br /> <br />, ~,-, <br />