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capacity) is currently being constructed. Figure 2-2 illustrates <br />Phase I, overall site plan. <br />2.1.5 Process Description <br />Mining Operations <br />Mining operations will deliver a saturated solution of sodium <br />bicarbonate in water (pregnant liquor) at temperatures ranging up <br />to 200°F. Production rates can be varied by varying temperature <br />and/or flow rate. <br />Surface operations will return preheated barren liquor for <br />reinjection. The solution mining operation is a net consumer of <br />water as saturated solution fills the cavity created by the <br />• dissolution of nahcolite. This increment of water will be added <br />in the process operations. For the design production rate of <br />125, 000 TPY, the water makeup rate for the mine is estimated at <br />15,221 lbs/hr or 30.4 gpm. This is to make up for cavity growth <br />only and assumes no other mine or system losses. Makeup rate is <br />linear with production rate. Additional water make-up is required <br />to cover "losses" in the process operations such as evaporation in <br />the drying and water treatment regeneration. <br />Flow meters, density meters and temperature and pressure sensing <br />devices are provided on the injection (barren liquor) lines and <br />the recovery (pregnant liquor) lines. These devices provide <br />information for control of the operation and for accounting <br />• purposes. <br />6 <br />