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n [7 these matters, and will be documented and certified by an engineer licensed in the State of California. • Periodic Leak Search: To determine if leaks in the final cover may have occurred, the landfill surface will be surveyed visually annually during spring/early summer to detect cracks and to identify areas of visible differential settlement. In addition, the surface emission monitoring program for the LFG control system will be used as an indication of leaks in the final cover. If LFG is detected above regulatory limits for surface emission monitoring, additional LFG detection and visual checking of that area will be undertaken to find and repair the source of observed cracks or leaks. • Settlement: Inspect for ponding and differential settlement. • Slope Failure: Observe visually while on-site. • Leachate Seeps: Observe visually while on-site. Cracks in the final cover will be sealed. Any erosion damage, which may occur as a result of extremely heavy rainfall, will be repaired. Temporary berms, ditches, and straw mulch will be used as needed to prevent further erosion damage to soil cover areas until site conditions permit replacement of eroded soil and reseeding of vegetation. Such action should prevent problems associated with leachate generation due to infiltration of surface water, gas venting through the cover at unacceptable levels, and vector attraction by exposed refuse. During the postclosure maintenance period, an aerial photographic survey of the entire site may be performed every five years to evaluate landfill settlement. These surveys may be used to prepare iso -settlement maps. Such maps will have a maximum contour interval of 2 feet and a scale of 1 -inch equals 100 feet. The site will be inspected quarterly and maintenance performed as necessary. 3.3.2 Inspecting and Maintaining the Drainage System Drainage control problems can cause accelerated erosion of a particular area within the landfill. Differential settling of drainage control structures can limit their usefulness and may result in failure to direct stormwater properly off the site. The final drainage system will be routinely inspected and evaluated for ponded water and blockage of, and damage to, drainage structures and swales. Proper maintenance will be immediately applied within areas where erosion problems are noted, or drainage control structures are damaged, to prevent further damage. PCMP for NCRCSL 3-3 Department of Public WorksiSolid Waste 0ASan Joaquin CountylNCRCSLO 180401PCPM11IFinal RepoRIPCPMP_Ret _Jan_2010.Doc County of San Joaquin - January 7, 2010