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• • <br />' <br />August 19, 1999 MEMORANDUM <br />993 -2057 <br />negligible hazards. Soils contamination is considered to be a very low hazard as described <br />on Table 2. The process plant area will be constructed with 6 -in. high curbing to contain <br />spillage of the largest single process vessel (80,000 gallons). Additionally there will be an <br />' overflow connection to the 3 -acre evaporation pond to prevent overtopping of the plant <br />curbing. The plant area will have a network of storm water conveyance and collection <br />ditches to prevent runoff from the industrial area. The exposure assessment indicated that <br />' the likelihood of a spill in the plant is medium even with employee training and adequate <br />signage on valves and controls to operational upset conditions. Magnitude and duration of <br />exposure are negligible due to large available containment within the plant area and the <br />' evaporation pond. Pathways to exposure are negligible due to available containment in the <br />curbing and ponds. The environment at risk is the industrial area adjacent to the plant and <br />contained within the storm water control system preventing discharges outside the disturbed <br />area. The overall consequence assessment is low to medium environmental consequences <br />will occur due to low potential hazards to soil and medium likelihood of occurrence. The <br />overall risk characterization is determined to be negligible and is controlled by the <br />negligible magnitude, duration, and pathways exposure risk as well as the industrial nature <br />of the environmental at risk. No addition mitigation is recommended. <br />' 8.5 Dusting of Dry Product <br />' Potential sources of dust from the experimental facilities include the dryer baghouse and <br />the truck loadout area. Subsidence and groundwater : and surface water contamination are <br />considered to be negligible hazards. Soils contamination is also considered to be a <br />' negligible hazard because of the five year operating life and very low quantities of dust. <br />The baghouse filters will have regular maintenance and replacement to minimize dust. The <br />trucks will be required to have cover to minimize dust during loading. The exposure <br />' assessment indicated that the likelihood of dust is medium even given these operational <br />controls. However, the magnitude and duration of exposure are negligible due to small <br />' production rates and limited facility life. Pathways to exposure are medium to high due to <br />potential that wind could carry the dust outside the industrial area. The environment at risk <br />is primarily the industrial area adjacent to the plant. The overall consequence assessment is <br />negligible due to negligible hazards to the environment. The overall risk characterization is <br />determined to be negligible and is controlled by the negligible hazard and the negligible <br />magnitude and duration exposure risk as well as the industrial nature of the environment at <br />risk. No addition mitigation is recommended. <br />8.6 Transportation Accidents <br />Potential failure mechanisms for transportation include spills due to accidents within the <br />lease area including access roads, plant area, and well field area. Spills would include <br />' fuels, solid and liquid reagents, and sodium bicarbonate product. Subsidence and <br />groundwater and surface water contamination are considered to be negligible hazards. Soils <br />contamination is considered to be a low to high hazard depending upon the type of <br />' \ \ GAI_DENI\ PROJECTS \WP\99 \2057\2057TM1.DOC Golder Associates <br />