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wood. According to the manufacturer, the tank exterior is insulated with a minimum of 1/4 inch thick Styrofoam covered by a 30-mil high density polyethylene geomembrane which provides secondary containment. The geomembrane is covered by 6 inches of concrete reinforced with '/2 inch rebar to provide fire protection, and ballistic and vehicle impact protection. The tank is used to accumulate a Combustible Liquid 11163 (i.e., waste oil). Waste oil is not flammable and has low volatility, and thus, a low vapor pressure. In accordance with the California Fire Code4, vessels and piping systems for Class I liquid S5 heated above the liquid flashpoint require bonding and grounding. The tank does not contain flammable vapors, flammable gases, or liquids that give off flammable vapors; thus, a (grounding rod) is not required. The tank was delivered new to the site on March 24, 1988 according to the tank manufacturer (ConVault, telephone: 800-222-7099 or 888-965-3227). Based on corrosion testing performed by the manufacturer, the 1/8 inch thick (10 gauge) steel tank is estimated to have an approximate 40-year service life. The tank manufacturer provided a 20-year warranty with this tank at the time of purchase. The tank and sump table are bounded by a building on the west and further protected from vehicular traffic and physical damage by a series of bollards and attached metal railing on the north and east sides. Piping and ancillary equipment (pumps) 66265.192(k)(2)(C&D): Piping Material of Construction: Galvanized pipe, braided, flexible, rubber hose. The hose shows no signs of swelling or cracking. Piping Diameter: 1-inch Pump location(s): The pump is rigidly mounted to a shelf on the backside of the sump table (drain rack). Used oil dumped or drained in the sump table is pumped into the tank from the sump table using a fixed, double-diaphragm, aluminum, pneumatic pump through 1-inch braided flex hose and rigid pipe. The sump table, pump, and hose/piping are located within the concrete curb containment. Pump type(s)/capacities: A 1-inch, pneumatic-driven pump (Graco Husky 1050) rated at 50 gpm (max.) is used to fill the tank. The pump system offers the ability to control flow (ON-OFF) via a ball valve and vary flow and discharge pressures by using an air filter(cleaner)/regulator and needle valve. Material Storage 66265.192(k)(8): Material and characteristics: Waste (used) oil from vehicles classified as a hazardous waste due to toxicity. There is also a potential for metal concentrations to be present in the used oil since it is being drained from metal equipment (engine blocks, differentials, etc.). The used oil is classified as a non- RCRA hazardous waste. 3 COMBUSTIBLE LIQUID. A liquid having a closed cup flash point at or above 100°F (38°C). Combustible liquids shall be subdivided as follows: Class 1116. Liquids having closed cup flash points at or above 200°F (93°C). 4 California Fire Code, 2016 edition, Chapter 57, Section 5705.3.2 Bonding of Vessels 5 FLAMMABLE LIQUID. A liquid having a closed cup flash point below 100°F (38°C). Flammable liquids are further categorized into a group known as Class I liquids. Wood Environment & Infrastructure Solutions, Inc. 1,000 Gal. Waste Oil Tank