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INFORMATION SHEET <br /> WEST COAST TOMATO OF CALIFORNIA <br /> SAN JOAQUIN COUNTY <br /> West Coast Tomato of California operates a facility which washes and packs fresh tomatoes for shipment. <br /> The operating season is approximately 75 days long, from late July through late October. Washwater is <br /> chlorinated to approximately 100 mg/1,total residual chlorine,to remove fungus and prevent early rot of the <br /> tomatoes. The facility has been in existence for several years. The discharge volume is 1500 gpd, average, <br /> and 2500 gpd, maximum. Surface water drainage in the area feeds into the City of Stockton storm drainage <br /> system, which eventually drains to the San Joaquin River. <br /> The effluent may contain some trihalomethane compounds due to the interaction of chlorine with organic <br /> material. In order to protect water quality, the Discharger will use bisulfite to remove detectable chlorine <br /> concentrations, then discharge the wastewater via sprinklers to a 1.4 acre disposal field adjacent to the <br /> processing area. Groundwater in the area is approximately 70 to 80 feet deep, and the soil has a permeability <br /> ranging from 0.06 to 0.02 in/hr. Also,the operating season is primarily during the time when air temperatures <br /> are very warm, and evaporation rates are high. It is anticipated that the discharge will not percolate more than <br /> a few inches into the soil, and will not impact water quality. <br /> In order to evaluate the concentrations of constituents in the wastewater being applied to the disposal area, <br /> the Discharger is requires to monitor BOD, total dissolved solids, and total residual chlorine monthly, and <br /> total trihalomethanes annually. <br /> PHL:5/16/95 <br />