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711 Materials, Inc. ,` ALTA Spill Prevention, Control and Countermeasure Plan ENVIRONMENTAL (7) Control leakage through defective internal heating coils by monitoring the steam return and exhaust lines for contamination from internal heating coils that discharge into an open watercourse or pass the steam return or exhaust lines through a settling tank, skimmer or other separation or retention system. Facility Response: The Facility contains no oil storage containers with internal heating coils. (8) Engineer or update each container installation in accordance with good engineering practice to avoid discharges. You must provide at least one (1) 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 audible air vent may suffice; (ii) 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; and (v) You must regularly test liquid level sensing devices to ensure proper operation. Facility Response: To avoid discharges from overfilling, tanks are equipped with liquid level gauges visible to the attendant filling the tank. These gauges will be monitored during the filling of the tank. Liquid level gauges are tested during monthly inspections by sticking the tank and comparing the reading to that on the liquid level gauge to ensure proper operations. In addition, the diesel fuel tank is equipped with automatic and emergency shut-off controls. Spill kits are available near all bulk storage containers. (9) Observe effluent treatment facilities frequently enough to detect possible system upsets that could cause a discharge as described in §112.1(b). Facility Response: All storm drain inlets in the concrete batch plant area are routed through a Bay Saver® underground in-line stormwater treatment unit, which is regularly cleaned by an outside contractor. The Bay Saver®will be inspected following any identified release that may result in flow into the storm drain, and at least monthly, for any significant quantity of oil. Any significant oil will be removed as soon as possible, but no later than two weeks after detection, and the unit will be pumped out at least annually. Alta Environmental 12 BASR-19-8895 July 3, 2019