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VII. DESCRIPTION OF ANALYSIS FOR DESALTING PLANT ALTERNATIVE This section describes, on a step by step basis, the analysis of the La Verkin Springs Unit which considers a desalting plant. This desalting plant is described in the previous report (USSR, February 1979). All the assumptions listed in the main report are valid here. The desalting plant alternat!ve considered here diverts 10.9 ft3/sec of La Verkin Springs, returns 83ft /sec of product water (284 mg/L) to the Virgin River and utilized 2.9 ft /sec of replacement water (705 mg/L) from Quail Creek Reservoi r. A. Estimate Concentration of Major Ions in Product Water From Desalting Plant 1. From Appendix C, Plans and Estimates (USBR, Fe~ruary 1979), the product water salinity is 284 mg/L; 6328 AF/~ear, 8.74 ft /sec. The flow of La Verk1n Springs was considered to be 12 ft /sec in the previous design esticlates. The actual recovery rate is 8.74/12 = 73;,. 2. Consider La Verkin SP3ing flow to be 10.9 ft3/sec and an actual recovery rate of 73~ yields 8 ft /sec at a salinity of 284 mg/L. 3. Fru~ Appendix C, plans and estimates, (USBR, February 1979) the feed water for the final 2 stage processing has the ionic distribution and dissolved solids concentration below: Na Ca Mg K Cl 504 Sl F B TDS - 2615 mg/L 180 mg/ L 119 mg/L 184 mg/L 3408 mg/L 1930 m9/L 29 mg/L 2.6 mg/L 5 mg/L 8472.6 4. Assume the percent ionic distribution does not change. Then the ionic distribution of the product water which is returned to the river can be apprC~lmatEd by multiplying each ion by 284/8473. The result of this esti~~tE is presEnte~ bflow: Na 88 mg/L Ca 6 mg I L "1g li. T:1g/ L K 6 mg! L Cl 114 mg!L SO 65 mg/L Si4 1 mg!L F B TDS 284 mg!L 1CJ OC2624