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Process Specialties, Inc. - 2 - 1 July 2011 Sample F3N. As a result of the larger wafers, more residual acid can cling to the wafers when they go into the rinse tanks. 3. Although the potentially applicable WQO for fluoride was exceeded in Sample F3N, the value reported does not exceed the California Maximum Contaminant Level (2.0 mg/L). Industrial and domestic wastewaters are mixed in the facility wastewater system. All domestic wastewater is discharged to a 2,000 gallon septic tank. The effluent from that tank is discharged to a second 2,000 gallon septic tank. The neutralized industrial wastewater is discharged directly to the second septic tank. The combined wastewater effluent is discharged to three 100 -foot long leach -lines, each equipped with an eight -foot deep seepage pit at the terminal end of the leach -lines. Mixing of the two wastewater sources dilutes the industrial wastewater prior to discharge to the leach field/seepage pit disposal area. Approximately 780 gallons of domestic wastewater is generated by the facility's 60 employees (estimated to generate approximately 13 gallons of wastewater per person'). Approximately 900 to 1,400 gallons per day of industrial wastewater is discharged to the second septic tank. Based on the wastewater characterization, the industrial wastewater discharge does not constitute a greater threat to groundwater quality than typical domestic wastewater. Therefore, the SJCEHD may continue to act as lead regulatory agency regarding the discharge. However, this determination is conditional on all of the following, now and in the future: 1. The facility is located within the City of Tracy boundaries. The City must provide written authorization to the SJCEHD to act as lead regulatory agency. 2. The SJCEHD must agree to act as lead regulatory agency for the industrial wastewater discharge. 3. The pH of the industrial wastewater must fall in the range 6.0 to 9.0. (A narrower target range of 6.5 to 7.5 is desirable). 4. Industrial flow rates cannot exceed 1,500 gallons per day as a monthly average. The monthly average calculation shall only include business days in which wastewater is discharged. 5. The character of the industrial wastewater must not significantly change. If PSI decides to expand and/or use other processes that will generate industrial wastewater, the Central Valley Water Board must be consulted again to allow reevaluation of lead agency responsibility. 1 Small and Decentralized Wastewater Management Systems, Crites and Tchobanoglous, Table 4-2, Typical Wastewater Flowrates from Commercial Sources, WCB/McGraw-Hill, 1998, T:\R5S Sections\Permittinq Title 27 Confined Animals\Units\Non 15 Permiltina\o Countv Files\San.lna ,wP,,r Rne m—, 7 1 -a on+, .+....