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El Samples may also be taken from the perimeter migration monitoring network for VOC analysis. For the purpose of closure cost estimates, it is assumed that 10 VOC samples will be taken semi- annually, for a total of 20 annually. The perimeter migration monitoring system will be maintained during the postclosure period. This forms the basis for the postclosure maintenance cost estimate in Section 3.4. It is planned that the majority of the LFG emission monitoring and control system will be installed for the landfill prior to final closure. Further, it is anticipated that LFG condensate will be delivered to the LCRS system and returned to the landfill with leachate in accordance with the current WDRs. Projected costs for operations and maintenance of an LFG emission monitoring and control system for the landfill are included in the postclosure maintenance cost estimate in Section 3.4. 2.5.7 Groundwater, Surface Water, NPDES, and Unsaturated Zone Monitoring Systems Groundwater Water quality is monitored consistent with WDR Order No. R5-2002-0219 (JTD Appendix A). The groundwater monitoring network presently consists of six groundwater monitoring wells (Figure 3). It is anticipated that four additional groundwater monitoring wells will need to be added during the operational life of the landfill prior to closure, providing a total of 10 groundwater monitoring wells to be maintained and monitored during the postclosure period. This anticipated final monitoring well network is the basis for the postclosure maintenance cost estimate in Section 3.4. Surface Water Surface water monitoring points will be selected to assess the impact, if any, of water contribution by the landfill to the Paddy Creek tributary. Samples will be taken where that tributary enters (the "upstream" sampling point) and exits (the "downstream" sampling point) the landfill property in the northern "mitigation zone." NPDES Stormwater Monitoring Stormwater will be sampled where it leaves the site or where it enters the "waters of the State" at the site. These points include discharge into the Paddy Creek system at two locations, and discharge from the site to neighboring properties to the south and west (Drawing 1). These discharge points are consistent with the discharge points established in the original PCPMP (1990). PCMP for NCRCSL 2-7 Department of Public WorksrSolid Waste O.ISan Joaquin CountylNCRCSL111804OPCPMPIFinal ReporAPCPMP_Rev_Jan_2010.Doc County of San Joaquin —January 7, 2010