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LEA Advisory #51—Disposal Si ostclosure Land Use Page 3 of 5 Check if the project involves waste excavation and relocation and/or consolidation. If yes, a thorough description of this activity should be provided including project health and safety measures and waste characterization, handling, processing, and placement. This activity may also fall under DISC jurisdiction if the waste is hazardous(e.g., burn dump ash with residue exceeding hazardous levels for metals). Guidance for complete removal of waste and waste residuals("clean closure") is contained in LEA Advi..s..oryNo, 16. For the specific case of burn dump remediation, a separate LEA Advisory will be issued. 2. CEQA Does the proposal include verification of compliance with the California Environmental Quality Act(CEQA) (e.g., Notice of Determination)?CEQA is required for the discretionary approval of a project by the LEA, which would include most postclosure land use changes. In most cases the local planning department is lead agency for ensuring compliance with CEQA requirements for these projects. If so, the LEA is a responsible agency and should coordinate with the lead agency early in the process. 3. Project Layout(27 CCR 21190(a-c)) Check site maps and grading plans to ensure that the specific limits of the land use change are clearly delineated with respect to the closed disposal site and all existing environmental monitoring and control systems. Check specifically for delineation of areas on waste that will be irrigated or capped by relatively impermeable materials such as asphalt concrete. These activities can result in increased landfill gas generation and migration. Environmental monitoring and control systems to be evaluated include site security, erosion control, drainage, leachate collection and removal, and landfill gas monitoring and control. Research site files to determine if there are documented problems with landfill gas, leachate, or drainage that must be specifically addressed in the project. All construction plans should be signed and stamped by an appropriately licensed professional such as a person registered as a civil engineer in the State of California[27 CCR 21780(a)]. 4. Environmental Monitoring and Control Systems (27 CCR 21190(a),(d)) Check facility layout with respect to existing environmental monitoring and control systems. Is the land use change compatible with the existing environmental monitoring and control systems?Will these systems need to be expanded, decommissioned, or reconstructed? If so, the proposal should include revised design plans, specifications, construction schedule, and revisions to the postclosure monitoring and maintenance plan. If required, it is important that on-site maintenance personnel implement monitoring and operations plans for landfill gas, in addition to ensuring that methane alarm systems are maintained. 5.Structures (27 CCR 21190(c-g)) Does the proposal include enclosed structures on waste or within 1,000 feet of the waste footprint within the property boundary? If yes, approval by the LEA is required (27 CCR 21190(c)). If yes, check to see if construction design standards of 27 CCR 21190(e)and (g) are met in plans and specifications(flexible utility connections, floor slab barrier, vent layer, vent piping, automatic methane sensors with alarm system, periodic methane monitoring program of structure). Check for evaluation of slope stability to ensure the integrity of landfill slopes under both static and dynamic conditions(27 CCR 21145). Check that a construction quality assurance(CQA) plan has been submitted.A CQA plan should be included to ensure that construction is completed in accordance with plans and specifications. The CQA plan should also include submittal and certification of as-built plans and specifications upon completion of construction. Equivalent alternative designs can be proposed but must be supported for the intended function. For example, it is very important that any alternative proposed to the standard geomembrane barrier layer have documentation (e.g., manufacturer specifications) showing equivalent low permeability to landfill gas. In addition, exemptions are allowed from the construction standards if the applicant demonstrates on a site-specific basis that there is no potential for adverse impacts on public health and safety and the environment from landfill http://www.ciwmb.ca.gov/LEAAdvisory/51/ 2/20/2008