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INFORMATION SHEET <br /> Libbey-Owens-Ford Company <br /> Lathrop Plant No. 10 <br /> San Joaquin County <br /> Libbey-Owens-Ford Company, Lathrop Plant No. 10, is an existing glass manufacturin <br /> plant near the community of Lathrop. The plant manufactures architectural (float <br /> glass, and both tempered and laminated automotive glass. <br /> Sanitary wastes are treated in an extended aeration basin/settling tank package <br /> plant followed by chlorination. Part of the industrial wastes are treated in an <br /> oil/water separator tank. These two waste streams are combined with cooling water, <br /> boiler blowdown, and stormwater in a one-million-gallon reservoir. Sanitary waste <br /> sludge is removed by a commercial disposal company; industrial waste sludge is taken <br /> to a landfill . <br /> Land disposal of effluent will be maximized by irrigating 30 acres of lawn and <br /> discharging to two evaporation/percolation ponds having a combined area of 15 acres. <br /> Effluent used for lawn irrigation will be adequately disinfected in accordance with <br /> Title 22. Effluent not used for land disposal is discharged to the San Joaquin <br /> River through outfall 001. The average discharge to the San Joaquin River is <br /> approximately 0.438 million gallons per day. At full plant production, the maximum <br /> allowable discharge will be approximately 2.1 million gallons per day, which <br /> includes storm water and basement infiltration water. <br /> The final effluent limitations for the combined wastes were determined, in part, in <br /> accordance with the effluent guidelines published in the Federal Register on 1 July <br /> 1988 for the Glass Manufacturing Point Source Categories by the Environmental <br /> Protection Agency. The guidelines set limits for the best practicable treatment for <br /> four (4) effluent constituents: total suspended solids, oil , phosphorous, and pH. <br /> Effluent limits are therefore based on production of each of the types of glass. <br /> Effluent from the process to manufacture glass, using a hydrofluoric acid wash, <br /> should have an insignificant impact on the San Joaquin River. This conclusion is <br /> based on a worst case scenario of a maximum effluent concentration of 23 mg/l <br /> fluoride and a minimum dilution of 1:120 in the San Joaquin River (0.5 mgd effluent; <br /> 60 mgd river flow, lowest mean monthly flow on record) , which should not increase <br /> the concentration in the San Joaquin River more than 0.20 mg/l fluoride. The <br /> average fluoride concentration in the San Joaquin River now is 0.20 mg/1 , and with <br /> the discharge, it should not exceed 0.40 mg/1 , well below the primary and secondary <br /> drinking water standard of 4.0 mg/l and 2.0 mg/l , respectively. <br /> Staff has reviewed the past self-monitoring data and discharge characterization <br /> submitted by the Discharger. The discharge has not caused an exceedance of any <br /> water quality objective, and as long as there is no material change in the <br /> discharge, none should occur during the span of this permit. <br /> PHL 1/16/91 <br />