SITE INFORMATION AND CORRESPONDENCE

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WASTE DISCHARGE REQUWENTS NO. 5-01-114 • -3- PILKINGTON NORTH AMERICA,INC. PILKINGTON GLASS FURNACE FACILITY SAN JOAQUIN COUNTY water treatment. The water is passed through sand filters and multimedia filters prior to entering the RO system. Sand filters are backwashed as needed to maintain flow rates. Backwash water is discharged to the wastewater system. 17. Domestic wastewater is treated in an activated sludge package treatment plant. Effluent from the package treatment plant is chlorinated prior to discharge. The system has a capacity of 25,000 gallons per day; the average flow rate is approximately 12,000 gpd. Sludge is periodically removed from the package plant by a septage hauler. 18. A hydrofluoric (HF) acid wash station was used intermittently when certain architectural glass products were in production. The HF acid was used to wash glass prior to cutting. The HF acid was neutralized prior to discharging to the wastewater system. The system is not currently in use but the Discharger wants to maintain the possibility of its use. 19. Wastewater flow rates are anticipated to decrease over the next ten years. The Discharger is planning to end automotive glass production in the next 12-18 months. At that time, the wastewater volume is expected to decrease by approximately 293,000 gpd. 20. All sources of industrial water flow into the wastewater collection system. Only the air compressor(s)blowdown(which might contain oil) is piped to and treated in the oil/water separator prior to discharge to the storage pond. Oil is removed from the facility by an oil collection and recycling vendor. 21. Stormwater which falls on land application areas infiltrates; stormwater which falls on the facility is collected by storm drains and is discharged to the storage pond and subsequently to the land application areas. The flow volumes listed in Finding No. 9 do not include stormwater flows. 22. Based on the Discharger's self-monitoring data from May 2000 to January 2001, the wastewater is low in BOD and total dissolved solids. Domestic and industrial wastewater quality and flow is characterized as follows: Constituent Units Value Flow Rate(estimated, including stonnwater) million gpd 1.2 Biochemical Oxygen Demand mg/l 10.5 Total Dissolved Solids mg/1 463 Coliform MPN/100 ml <2 23. The Discharger submitted a water balance in the RWD which demonstrated the capacity to dispose of approximately 785,000 gpd of wastewater to its land application area. The water balance was calculated using 40 acres and did not include all the available land application area. The 40 acre value constitutes nearly all of Site A which is approximately 42 acres. Approximately 35.4 acres are potentially available for use as additional application areas. The flow limit included in these WDRs allows a discharge flow limit slightly more than 785,000 gpd because the additional land area will be available. 24. A second water balance was submitted on 24 April 2001 which included all the potentially available land application area(75.4 acres). That water balance demonstrated the capacity to