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/—a 14� a Executive Summary This report summarizes Phase H of the Panoche Burn Site Remediation performed by the California Integrated Waste Management Board (CIWMB) in cooperation with the U.S. Environmental Protection Agency (EPA), Region IX, Emergency Response Office. On May 20, 1996, a tire fire consumed approximately 1 million to 2 million tires dumped throughout the canyon. A major concern of the tire fire was the potential for a release of pyrolytic oil down the canvon and into Little Panoche Creek. Because one tire can produce up to 2 gallons of oil, the potential existed for 2 million gallons to be discharged 300 yards into the creek. To minimize the release, the tire fire was allowed to burn and was contained up-canyon by an earthen berm. This decision was based on past tire fire fighting efforts where water accelerated the discharge of pyrolytic oil and caused massive runoff problems. After the fire. approximately 4 acres were covered with 1 to 5 feet of ash, metal debris, and pyrolytic oil residue. Samples showed the ash contained high levels of zinc ranging from 32,000 milligrams per kilogram (mg/kg) to 156,000 mg/kg and other contaminants such as petroleum hydrocarbons. Zinc levels in the soil exceeded the EPA's preliminary remediation goal of 10,000 mg/ka for soil in industrial areas and the California Department of Toxic Substances Control's criteria for hazardous waste of 5,000 mg/kg. Because of the proximity of the hazardous ash to the creek, the EPA requested the CIWMB to remediate the Panoche Burn Site. The CIWMB began the tire ash remediation on October 17, 1996, and completed the project on December 20, 1996. However, the site sustained serious erosion damage from the January 1997 storms. The CIWMB remediation contractor remobilized and finished the repair work on February 4, 1997. The Panoche Burn Site Remediation consisted of con- solidating and encapsulating the burn ash and pyrolytic oil stained soil in the upper canyon, constructing a retention dam, and installing erosion control devices. Approximately 18,070 cubic yards of burn ash and contaminated material were encapsulated in the upper part of the canyon. The total expenditure for the remediation project was $159,810 for engineering design, construction management, environmental sampling, and surveying and $487,994 for construction. CIWMB i