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Environmental Standard Procedure <br /> Page 5 <br /> 3.3.4.6. T6 (30% Sodium Hydroxide Storage Tank) — 540 gal double contained <br /> HDPE tank placed above grade on an epoxy coated double contained <br /> concrete slab that provides tertiary containment. 30% Sodium Hydroxide <br /> solution from T6 is automatically pumped to T3, T4 or T5 via metering <br /> pump to neutralize any transferred process waste solution. <br /> 3.3.4.7. T7 (36% Sulfuric Acid Storage Tank) — 540 gal double contained HDPE <br /> tank placed above grade on an epoxy coated double contained concrete <br /> slab that provides tertiary containment. 30% Sodium Hydroxide solution <br /> from T6 is automatically pumped to T3, T4 or T5 via metering pump to <br /> neutralize any transferred process waste solution. <br /> 3.3.4.8. TS (Non-RCRA Hazardous Waste Storage Tank) -- 500 gal double <br /> contained HDPE tank placed above grade on an epoxy coated double <br /> contained concrete slab that provides tertiary containment. Hazardous <br /> waste is pumped into the tank via overhead schedule 80 piping. The <br /> waste is disposed offsite via hazardous waste manifest. <br /> 3.3.4.9. T9 (Non-RCRA Hazardous Waste Storage Tank) — 500 gal double <br /> contained HDPE tank placed above grade on an epoxy coated double <br /> contained concrete slab that provides tertiary containment. Hazardous <br /> waste is pumped into the tank via overhead schedule 80 piping. The waste <br /> is disposed offsite via hazardous waste manifest. <br /> 3.3.4.10. T10 (Non-RCRA Hazardous Waste Storage Tank) — 500 gal double <br /> contained HDPE tank placed above grade on an epoxy coated double <br /> contained concrete slab that provides tertiary containment. Hazardous <br /> waste is pumped into the tank via overhead schedule 80 piping. The waste <br /> is disposed offsite via hazardous waste manifest. <br /> 3.3.4.11. V1 (Discharge Valve) — neutralized process waste water from T5 is <br /> discharged off-site via V1 in the open position. V1 is closed if there is any <br /> risk of accidental or non-compliant off-site discharge. <br /> 3.3.4.12. V2 (Retreatment Valve) — process waste water from T5 is discharged <br /> back to T1 via V2 in the open position if re-treatment is necessary. V2 is <br /> closed unless re-treatment is necessary. <br /> 3.3.4.13. V3 (T1 Output Valve) — V3 is open during normal operation and closed <br /> after hours to prevent the output line from losing "prime." <br /> 3.3.4.14. V4 (Secondary Containment Valve) — V4 is in the closed position during <br /> normal conditions. In the event of an accidental discharge or rain water <br /> collection within the epoxy coated concrete slab and berm secondary <br /> containment area, V4 in the closed position will ensure that collected <br /> material can be investigated prior to introduction into T1. <br /> 3.4. Inspections and Discharge Monitoring Procedure <br /> 3.4.1. Discharge Monitoring Procedure <br /> 3.4.4.1. Step 1 Identify the waste and estimate the volume to be discharged. <br />