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chips are blended together with hot petroleum wax. The mixture is cooled, then extruded into a log form. The logs are wrapped, packaged, and shipped off site. (5) Additional waste wood from the Duraflame log and cedar slat production are burned as fuel in a boiler to create steam that powers an 8.5 megawatt cogenerator (5). Since the wastes used for fuel in the boiler are not hazardous substances, the fly ash generated by the boiler is nonhazardous. The boiler was permitted and began operation sometime in the early 1970s (Permit N150-8-0). The boiler has not been in operation for more than 10 days since 1991. (8) The San Joaquin Valley Unified Air Pollution Control District has permitted various air discharge operations, including the generator, since 1970 (9). The hazardous wastes generated on site consist of combustible waste, including gear grease, diesel, antifreeze, spent oils, expired inks, liquids from process materials, and solid sludge from the wax/stain process. Corrosive liquid wastes consist of caustic soda beads, boiler chemicals, and sodium hydroxide. Flammable liquid wastes consist of acetone, isopropanol, gasoline, and degreasing wax. Other wastes generated on site are petroleum sludge wax, aerosol cans, paint sludge, waste oil and absorbant mixture, paint, and non-RCRA waste. (10, 11) Wastes are hauled off site every 90 days by Falcon Energy Associates or Safety-Kleen Corporation and disposed of at Kiesel Company in St. Louis, Missouri; Gibson Environmental in Bakersfield, Calif.; or Safety- Kleen Corporation in Denton, Texas (5, 10). Currently, hazardous substances are stored along the southern property boundary of the site. There are seven containment pallets—two for wastes and five for raw products. A maximum of one hundred twenty-six 55-gallon drums can be stored within these containment pallets measuring 15 feet long by 7.5 feet wide by 4 inches high. (5) Each pallet can hold a maximum of eighteen 55- gallon drums. The containment pallets were in place as of 1988 (8). Four metal posts are affixed to the corner of each pallet and hold the drums approximately 8 inches above the concrete pavement. A corrugated metal roof is attached to the top of the posts at a height of approximately 8 feet. Each pallet has a spigot for draining spillage from stored drums. (5) Each pallet can collect up to 900 gallons of overflow. Prior to the containment pallets, drums were stored on wooden pallets on concrete along the southern side of the site. (8) Hazardous waste and product drums throughout the site are placed within larger polypropylene containers with emergency spill kits nearby. (5) According to hazardous waste manifests, it is estimated that Cal Cedar generates 3,310 gallons of hazardous wastes every three months (10). A covered 20 cubic-yard solid waste container is used for the storage of wet and fly ash. Prior to 1976, hazardous substances such as spent oils, solvents, and waxes were reused or recycled into the manufacturing of cedar slats and Duraflame fireplace logs. Waste oils were reused as chain lubricants. Waste solvents, not lost to evaporation, were added to the waste oils. All waxes were recycled into the production of the Duraflame fireplace log. It is not known what quantity of waste remained, if any, and what was done with any residual hazardous substances at this time. (8) 2.4 Regulatory Involvement 2.4.1 U.S. Environmental Protection Agency (EPA). The site is not listed in the EPA Resource Conservation and Recovery Act (RCRA) database as of January 19, 1993 (12). PA California Cedar Products-W (F) • 5/93 5 Printed on 50% recycled paper. Qe