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Brown Sand,Inc. Spill Prevention, Control, and Countermeasures Plan Page: 13 June 3, 2020 3.4.4 Drainage of Un-Diked Areas (40 CFR 112.8(b)(3)) There are no un-diked areas of the facility that have a potential to discharge oil as a result of a release. Tank loading/ unloading procedures are closely followed as outlined in Section 3.11 in order to prevent a release from occurring, and the Spill/Discharge Response Plan, located in Section 4.0 of this plan, outlines the facility's spill response procedures. 3.4.5 Overfill Prevention Systems (40 CFR 112.8(e)(8)) The On-road diesel tank, gasoline tank, and two off-road diesel tanks are equipped with ST90 wireless tank monitor, electronic liquid sensing devices and tank level gauges. Loading/unloading procedures are discussed in Section 3.11. All sensing devices and gauges are inspected and tested on a regular basis to ensure proper operation. The aboveground storage tanks located in the Waste Oil and Bulk Oils Area (Map Location #1) at this facility are equipped with tank specific calibrated measuring stick to monitor the liquid level within each tank. Based on the size of the tanks (< 1,000 gallons), the tanks being contained within appropriate secondary spill containment (double walled tanks or contained within secondary steel spill containment), and the storage location being on an impervious concrete floor, all storage tanks meet the criteria for environmental equivalence for overfill prevention requirements. To ensure overfilling does not occur during filling activities, the following procedures will be followed: • The liquid volume of the tank is measured with the calibrated measuring stick prior to filling to calculate the available 90%volume of the tank. o Calibration sticks are marked at the 90% capacity level Tanks ID 90% Capacity Waste Oil Tank 900 gallons Transmission Oil Tank 315 gallons Hydraulic Oil Tank 315 gallons Motor Oil Tank 450 gallons • The delivery driver monitors the pump meter continually during tank loading to ensure the added volume does not exceed the calculated 90%. • Periodically during filling activities, the tank is measured with the calibrated stick to determine the correct remaining volume of the tank.