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<br />Preliminary Closure and Postclosure Maintenance Plan 3-3 Department of Public Works/Solid Waste <br />North County Recycling Center and Sanitary Landfill County of San Joaquin <br /> <br />• Settlement: Inspect for ponding and differential settlement. <br />• Slope Failure: Observe visually while on-site. <br />• Leachate Seeps: Observe visually while on-site. <br />Erosion damage, which may occur as a result of extremely heavy rainfall, will be repaired. <br />Temporary berms, ditches, and straw mulch will be used as needed to prevent further erosion <br />damage to soil cover areas until site conditions permit replacement of eroded soil and reseeding <br />of vegetation. Such action should prevent problems associated with leachate generation due to <br />infiltration of surface water, gas venting through the cover at unacceptable levels, and vector <br />attraction by exposed refuse. <br />During the postclosure maintenance period, an aerial photographic survey of the entire site will <br />be performed every five years to evaluate landfill settlement. These surveys will be used to <br />prepare iso-settlement maps. Such maps will have a maximum contour interval of 2 feet. <br />The site will be inspected quarterly at a minimum, and maintenance performed as necessary. <br />3.3.2 Inspecting and Maintaining the Drainage System <br />Drainage control problems can cause accelerated erosion of a particular area within the landfill. <br />Differential settling of drainage control structures can limit their usefulness and may result in <br />failure to direct stormwater properly off the site. <br />The final drainage system will be routinely inspected and evaluated for ponded water and <br />blockage of, and damage to, drainage structures and swales. Such conditions will be <br />immediately corrected within areas where such problems are noted, to prevent further damage. <br />Inspections will be conducted during the following time frames: <br />• One month prior to the normal start of the rainy season <br />• Within one week after the occurrence of the first two major storm events <br />• Within one month after the end of the rainy season <br />The inspections will identify deficiencies and necessary maintenance will be conducted when <br />weather conditions and site conditions allow. <br />3.3.3 Maintaining the Vegetative Cover <br />The vegetative cover will be routinely inspected and evaluated for any signs of stress; that is, <br />stunted growth, wilting, or changes in its natural color in excess of normal seasonal changes <br />that may be caused by LFG emissions or leachate seeps. Bare spots will be identified and <br />revegetated. Inspections will be performed monthly during the rainy season for the first year <br />and quarterly thereafter.