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C Groundwater, surface water, NPDES, and unsaturated zone monitoring will include all facilities described in Section 2.5.7. It is assumed that this monitoring and reporting will be similar to those now in place, which include quarterly groundwater elevation and semiannual water quality laboratory testing. Leachate monitoring and control will include operation, maintenance, and monitoring of the facilities described in Section 2.5.10. Leachate will continue to be returned to the refuse in accordance with the WDRs. The procedures for monitoring and reporting during postclosure are assumed to be similar those in the current WDR for the landfill, which include monthly flow quantities and annual leachate quality laboratory testing for the LCRS. 3.3 Postclosure Maintenance Section 21825(b)(2) requires a preliminary description of the methods, procedures and processes that will be used to maintain, monitor, and inspect the closed landfill during the postclosure maintenance period to comply with Section 21180. Section 21180, the California Department of Resources Recycling and Recovery (formerly the CIWMB), requires that areas in which final cover is placed prior to closure of the entire landfill shall be maintained in accord with an approved Postclosure Maintenance Plan. Section 21090(a)(3)(B) and (4), Closure and Postclosure Maintenance Standards for Disposal Sites and Landfills, requires a Cover -Integrity Monitoring and Maintenance Program that addresses maintenance of all components of the erosion -resistant layer of the final cover. The program will also include a schedule for periodic monitoring to inspect the integrity of the low -hydraulic -conductivity layer, periodic identification of problem areas (e.g., erosion, damage, severe settlement), prompt cover repair, and vegetation maintenance. 3.3.1 Maintenance of the Integrity and Effectiveness of the Final Cover This program will involve repairing the cover as necessary to correct the effects of settling, subsidence, erosion, or other events. A postclosure inspection program will ensure that the landfill cover retains its integrity as follows: • Evidence of Erosion: During the winter months, a survey will be conducted after the first major rain event. Another survey will be conducted after the rainy season. • Ponded Water: The final cover will be inspected after significant rainfall events to identify areas that pond water. When conditions allow, the identified areas will be filled and graded to eliminate low spots and promote positive drainage. • Exposed Refuse: Survey in conjunction with erosion inspection. Exposed refuse is a serious condition that will require the replacement of the closure barrier layer. Such replacement will be as approved by the regulatory agencies with jurisdiction over PCMP for NCRCSL 3-2 O.ISan Joaquin Count)ANCRCSL111804aPCPMPIFina1 ReporAPCPMP_Rev_Jan_2010.Doc Department of Public WorksrSolid Waste County of San Joaquin — January 7, 2010