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Environmental Standard Procedure Page 3 approximately 5 gallons of additional water. This results in a total discharge of— 75 gallons each time the tank is changed. The operator responsible for discharging the rinse solution must take care to routinely monitor the T5 pH controller outside to verify that the final pH discharge is between 6 toll and then record the discharge on the Etch Hazardous Taste Log. 3.2.6. Etch Solution -- spent etch solution is manually discharged into the U1 T1 process waste water collection tank via a floor drain located near the south east corner of the Etch room. When the solution is no longer effective, the drain valve is partially opened draining the solution slowly into the On-Site treatment system for eventual pH adjustment. The tank is then washed and drained again with approximately 5 gallons of additional water. This results in a total discharge of 75 gallons each time the tank is changed. The operator responsible for discharging the etch solution must take care to routinely monitor the T5 pH controller outside to verify that the final pH discharge is between 6-11 and then record the discharge on the Etch Hazardous Waste Log. 3.2.7. Chemco 33S Solution — spent Chemco solution is manually discharged into the U1 T1 process waste water collection tank via a floor drain located near the south east corner of the Etch room. The drain valve is partially opened draining the solution slowly into the On-Site treatment system for eventual pH adjustment. The tank is then washed and drained again with approximately 5 gallons of additional water. This results in a total discharge of — 75 gallons each time the tank is changed. The operator responsible for discharging the rinse solution must take care to routinely monitor the T5 pH controller outside to verify that the final pH discharge is between 6 toll and then record the discharge on the Etch Hazardous Waste Log. 3.2.8. Easisolv Screen Wash — spent screen wash is discharged into the U1 T2 process waste water collection tank via a wash basin drain located in the screen preparation area. Screen wash is gradually discharged into the On-Site treatment system for eventual pH adjustment as screens are cleaned. The amount of discharge various depending upon the dirtiness of the screen and the discharge is recorded when the operator refills the 24oz squirt bottle. The operator responsible records the discharge on the Screen Clean Hazardous Waste Log. 3.2.5. Anodal Cleaner Solution — spent Anodal Cleaner mild alkaline cleaning solution (ph w 10.0) is discharged into the U1 T1 process waste water collection tank via drain located in the coil anodizing line. The cleaning solution is typically discharged once per week (when the anodizing line is processing material — 213 of the year) into the On-Site treatment system for pH monitoring and adjustment. The amount of discharge is 35 gal. The operator responsible records the discharge along with any additional necessary on the Anodizing Hazardous Waste Log. 3.3. System Description (Refer to plot diagram as necessary) 3.3.1. Tanks and Valves 3.3.4.1. T1 (Process Waste Water Collection Tank) — 330 gal double contained below grade HDPE tank placed within an epoxy coated open top concrete vault that provides tertiary containment. Waste water and solutions are introduced into the tank via below ground double walled polypropylene piping. Process rinse water from the etching and anodizing processes are