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CNAPTERTWO Proposed Action and Alternawes ' The new process building would house the following three segments: 1) the dryer and crystallizer azea; 2) the bicazbonate area; and 3) the bicarbonate bagging area. In addition, there would be a new electrical building located to the west of the process building. ' Three soda ash storage silos would be located south of the process building. A conveyor gallery would transfer the soda ash product from the process buildings to the silos, and a belt feeder would transfer the product to a loadout feed conveyor located beneath the silos. The loadout feed conveyor would transfer the product from the silos to the soda ash loadout surge bins, which would be located above the railroad cazs. Another conveyor gallery east of the silos would transfer bicazbonate product from the process building to the bicazbonate loadout surge bin to the railroad cazs. The four Pazachute Site ponds would include: ' • A 1-acre stormwater retention pond would be located neaz the southeast corner of the site. The total disturbance azea would be approximately 2 acres. • A 2.8-acre water storage pond would be used to store make-up water (fresh water) from the water delivery system prior to treatment and use by the project. The pond would have a clay liner. This pond would be created by regrading and berming the site of a previous Unocal pond system, and, therefore, its construction would not constitute new disturbance. • A 15-acre evaporation pond would be located where Unocal previously had two ponds, and ' the azea would be regraded and bermed for the new pond. Therefore, construction of the evaporation pond would not constitute new disturbance. The fluid streams that would be dischazged to the evaporation pond are reverse osmosis (RO) reject, sand filter discharge, and boiler blowdown. The boiler feedwater originates from the Pazachute Site raw water system. Sand filter discharge is water that is backwashed from the sand filter that treats raw water entering the Pazachute Site. Solids accumulation in the evaporation pond is not anticipated to ' occur at a level that would require its removal. The predicted water quality is provided in Table 2-4. ' • An additiona121-acre storage pond would be needed to store purged water from the processing equipment. This pond is referred to as the MVR (mechanical vapor recompressor) purge pond. The MVR purge pond would consist of fluid dischazged from the ' final processing equipment. Solids accumulation would occur in this pond primarily in the form of sodium carbonate that crystallizes as temperature is dissipated. Solids would be periodically dredged and returned to the process system. No other disposal of solids from this pond is anticipated. The predicted water quality is provided in Table 2-4. The total disturbance azea would be approximately 33 acres. ' The evaporation pond and the MVR purge pond at the Pazachute Site would be constructed with a double liner and leak detection system in accordance with the requirements of CDMG. The liner system would consist of two geomembrane liners and a leak detection and collection t system. The top liner would be 60-mil HDPE, and the bottom liner would be 40-mil HDPE. A geonet material would be installed between the two liners to collect and transport any water that may leak through the upper liner. The geonet layer would drain to a sump system. The sump would be equipped with a submersible pump, which would be automatically activated by a fluid- level sensor switch in the sump. ' 2-15