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WASTE DISCHARGE REQUAENTS NO. 5-01-114 , -2- <br /> PILKINGTON NORTH AMERICA,INC. <br /> PILKINGTON GLASS FURNACE FACILITY <br /> SAN IOAQUIN COUNTY <br /> 8. Wastewater volumes reported in the RWD and self-monitoring reports are based on run times <br /> of pumps. Wastewater flow is not currently metered at the site. These WDRs require <br /> installation of flow meters to determine the actual wastewater flows. A basin test performed <br /> on 17 April 2001 indicated the approximate process water flow rate is 575,000 gallons per <br /> day(gpd). <br /> 9. According to the RAID, the Discharger currently generates approximately the following <br /> amounts of industrial and domestic wastewater on a daily basis. Domestic and industrial <br /> wastewater are commingled prior to discharge. <br /> Source Units Approximate <br /> Wastewater Generated <br /> Groundwater Infiltration gpd 50,000 <br /> Float Glass Manufacturing gpd 58,000 <br /> Tempered Automotive gpd 134,000 <br /> Laminated Automotive gpd 159,000 <br /> Cooling Tower and Boiler Blowdown gpd 89,600 <br /> Reverse Osmosis Reject Water gpd 85,000 <br /> Domestic Wastewater(package plant) gpd 12.000 <br /> Total gpd 587,600 <br /> 10. Groundwater infiltrates the basement of the float glass manufacturing building. Groundwater <br /> collection, treatment, and discharge occurs year round. <br /> 11. Float glass manufacturing requires washing of the glass prior to cutting and packaging. The <br /> wash water is treated through a reverse osmosis (RO) system prior to washing activities. <br /> 12. Production of tempered automotive glass includes the use of a synthetic oil and water <br /> mixture as a coolant and lubricating medium for grinding and cutting. A final wash of the <br /> fabricated product is made to remove the cooling agent and any residual grindings. <br /> 13. Production of laminated automotive glass products includes extensive washing of the <br /> components. RO water is used in the processes to ensure the components are clean and free <br /> offoreign material prior to assembly of laminated glass. <br /> 14. The facility uses non-contact cooling water to provide the necessary heat exchange for the <br /> facility's glass melting furnace cooling system. Non-contact cooling water requirements for <br /> this system are provided by a three cell cooling tower located south of the glass melting <br /> furnace. Blowdown from the system is the only wastewater generated in the non-contact <br /> cooling industrial process. Water for the cooling tower is treated with an anti-fouling and <br /> scalant agent. <br /> 15. Facility air compressors and chillers are serviced by a second cooling tower, south of the <br /> boiler room. Water treatment additives are used in the cooling towers and boiler to control <br /> pH, corrosion, scale formation, and microbial growth. <br /> 16. Purified and demineralized water for glass washing and other uses at the plant is supplied by <br /> an RO system. Approximately 85,000 gpd of reject water is discharged to the wastewater <br /> system. The RO system uses sodium hypochlorite, sodium bisulfite, and hypersperse in the <br />