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Pump operation will be remotely monitored and recorded to provide a record of <br />leakage volume and average rate of leakage. Manual inspection of the sump will <br />occter daily to verify sump operation. Leakage limits will be established with CDMG <br />based on the final design of the pond. If leakage limits are exceeded, American Soda <br />will repair the upper liner. <br />The beans for each pond will be designed in accordance with Burenu of <br />Reclamation Small Dam Design criteria. The ponds will have s:~fficient freeboard to <br />accommodate the 100-year (24-hr) precipitation event and wave action. Pond <br />volume will be obtained by a combination of excavation and berming. Outside <br />slopes will be 3:1 and inside slopes will be 2:1. Anticipated berm height is 10 feet for <br />the Piceance Site evaporation pond, Parachute Site evaporation pond, and the <br />Parachute Site MVR purge pond. <br />The fluid streams that discharge to the Piceance Site evaporation pond will be the <br />cooling tower blowdown, boiler blowdown, and pressure filter waste solids. Cooling <br />tower blowdown is a purge of the cooling water that is continuously recirculated. <br />Water conditioning chemicals are usually added to the water in order to inhibit <br />scaling and corrosion of the plumbing. About 20 percent to 25 percent of the cooling <br />water must be purged to control the buildup of impurities as the cooling water <br />evaporates. Boiler blowdown is similar to cooling tower blowdown. It is a purge of <br />boiler water to control impurity buildup within the boiler. Pressure filter waste <br />solids will likely consist of sodium carbonate solids and insoluble grit and sediment <br />materials. <br />The total volumetric flow rate to the pond is expected to be approximately 18 gallons <br />per minute (gpm) and the long-term TDS level is estimated to be between 150,000 <br />and 200,000 ppm. Solids accumulation is not anticipated to occur at a level that will <br />require removal. Specific details of the fluids that will be discharged to the Piceance <br />Site evaporation pond are described in the following table. <br />Piceance Site Evaporation Pond <br />Parameter Value <br />Summer Winter <br />Inlet Temperah~re °F 155 155 <br />Pond Temperature °F 60 35 <br />Inlet pH 10 10 <br />Inlet °oTDS 20.5 5.5 <br />Inlet % Na,CO~ 13 3 <br />Inlet % NaCI 0.10 0.10 <br />Inlet % Nn,SO, 0.10 0.10 <br />Inlet % NaHCO, 2.5 2.5 <br />14 <br />