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• C. Water quality of the raw water was typical of the A-Groove aquifer on <br />the NaTec site with moderate conductivity (1,485 umhos/cm-, pH <br />(8.11, SAR (30.31, sodium (273 mg/I), TDS (748 mg/I) and high <br />fluoride (14.3 mg/I). <br />d. In 1991, raw water was pumped from well 90-1 and utilized for initial <br />water to evaporation ponds, process feed and domestic uses. The <br />following is pumpage information for 1991: <br /> anuar February March Aril <br />Pumpage (gal.) 279,400 560,900 1,352,700 1,410,914 <br />Average (g•p.m.) 6.3 3.9 30.3 32.7 <br /> Mav June Julv Au us <br />Pumpage (gal.) 1,170,861 1,467,292 952,100 1,001,600 <br />• Average (g.p.m.) 26.2 34.0 21.3 22.4 <br /> September October November December <br />Pumpage (gal.) 148,400 0 0 48,300 <br />Average (g.p.m.) 3.4 0 0 1.1 <br />Pumpage quantities (total of 8.4 million gallons or 15.7 gpm) were <br />much less than allowed (110 gpm) or anticipated for first year. <br />e. Process modifications included installation of new piping to change <br />the flow to and from crystallizers, modify heat exchangers to reduce <br />plugging, adding a different type of heat exchanger for evaluation, <br />and adding CO2 to enhance bicarb production. <br />f. As a result of increasing concentrations of sodium chloride in the <br />• pregnant liquor April - May (see Figure 4-51, the Bird filter was <br />modified with spray nozzles to wash the wet bicarb on the filter. This <br />22 <br />