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6. Post Closure The CIWMB is one of many agencies under the California EPA. Unlike the DTSC and the RWQCBs, the CIWMB neither regulates nor has the authority to work with hazardous waste. The Solid Waste Cleanup Program administers and directs the Solid Waste Disposal and Codisposal Site Cleanup Program, which is dedicated to the remediation of closed, abandoned, and illegal solid waste disposal sites throughout California. Even though burn dumps are usually classified as hazardous waste sites, the SWCP performs the necessary onsite remediation at burn dumps through a letter agreement with DTSC. This agreement allows the CIWMB to work with the U.S. EPA and address the Panoche Burn Site. By law, the cleanup program is limited in the type of remediation the CIWMB can perform and fund. The CIWMB does not fund hazardous waste removal, landfill closures, postclosure maintenance, or groundwater remediation. The second phase of the Panoche project was designed in accordance with the "National Oil and Hazardous Substances Pollution Contingency Plan," Title 40, Code of Federal Regula- tions (CFR), Part 300.415. CFR Part 300.415 (e) allows for the following actions to limit potential exposure to populations, animals, or the environment: 1. Place fences, warning signs, or site controls to prevent access 2. Construct drainage controls to prevent precipitation or run-on from entering the site or reduce the migration of hazardous substances offsite 3. Cap the contaminated soils to reduce the migration of hazardous substances into the soil, groundwater, surface water, or air 4. Excavate or consolidate contaminated soils from drainage or other areas to reduce the spread of contamination This remediation was designed and implemented with long-term viability. For example, 4 to 5 feet of onsite clay was placed and compacted on top of the ash fill. The laboratory results of the clay showed the cover material had a laboratory permeability of 4.2 x 10-9 cm/sec. Also, the compaction of the soil was independently tested to ensure the material was properly placed. The clay cover, if properly maintained, will restrict the flow of precipitation through the cover. For this remediation to be considered successful, a responsible party (RP) must be identified. As previously discussed, the CIWMB does not have a program available to maintain this site. The RP should perform the necessary maintenance and additional monitoring to prevent a release of hazardous waste. If the required postclosure maintenance is not performed, the CIWMB cannot ensure the integrity of the monolithic cover, drainage systems, retention dam, or the erosion control devices. Typically, for the first 5 to 10 years, the RP should plan for semi-annual activities at the site. The minimum activities should include: CIWMB 41