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1.4.8 Liquid -Level Sensing Devices Spill Prevention, Control, and Countermeasure Plan Siwilt Transportation, Inc. -- Latlimp, California Section 14: Bulk Storage Tanks/Secondary Containment February 2016 112.8(cX8): You must engineer or update each container installation in accordance with good engineering practice to avoid discharges. You must provide at least one of the following devices: (i) High liquid level alarms with an audible or visual signal at a constantly attended operation or surveillance station. In smaller facilities an audihie air vent may suffice. High liquid level pump cutoff devices set to stop flow at a predetermined container content level. (iii) Direct audible or code signal communication between the container gauger and the pumping station. (iv) A fast response system for determining the liquid level of each bulk storage container such as digital computers, telepulse, or direct vision gauges. If you use this alternative, a person must be present to monitor gauges and the overall filling of bulk storage containers. (v) You must regularly test liquid level sensing devices to ensure proper operation. As noted in Table 3-1, the three 10,000 gallon diesel ASTs have level indicator gauges, which are tested daily, since the quantity of fuel must be constantly monitored. The ASTs are equipped with an audible alarm and a flashing alarm for both high fuel level and leak detection between the walls of the ASTs. The visible (flashing) alarm is mounted .on the small building adjacent to the fuel island. A fuel cut-off valve (flapper) is installed on the fill port of the diesel ASTs to prevent overfill_ The split new oil/used oil AST outside the service building is equipped with level gauges and is inspected every day. New oil is filled at the AST and is directly observed by the delivery truck driver. Used oil is collected at a location along the inside northeast wall of the service building. The used oil collection area lacks an appropriate liquid level sensing device because the visual indicator on. the AST cannot be seen by the individual pumping used oil to the AST from the used ail collection point. Liquid -level gauges will be regularly tested to ensure proper operation in accordance with industry standards. Protection against AST overfill is achieved by (1) awareness of available AST capacity and inventory, (Z) careful monitoring (either manually or automatically), and (3) control of product movement. At a minimum, direct audible or code signal communication between the container gauge and the pumping station is required. Appendix A provides a summary of regulatory deficiencies related to liquid level sensing devices. INDUSTRY STANDARD CONSIDERATION: NFPA 302012, Section 21.8.6 states that storage tanks and their appurtenances, including normal vents, emergency vents, overfill prevention devices, and related devices, shall be inspected and maintained to endure they function as intended in accordance with written procedures. 145