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<br />Preliminary Closure and Postclosure Maintenance Plan 2-8 Department of Public Works/Solid Waste <br />North County Recycling Center and Sanitary Landfill County of San Joaquin <br /> <br />It is anticipated that two wells will be removed during buildout, providing a total of <br />11 groundwater monitoring wells to be maintained and monitored during the postclosure period. <br />This anticipated final monitoring well network is included in the postclosure maintenance cost <br />estimate. <br />Surface Water <br />Surface water monitoring points will be selected to assess the impact, if any, of water <br />contribution by the landfill to the Paddy Creek tributary. Samples will be taken where that <br />tributary enters (the “upstream” sampling point) and exits (the “downstream” sampling point) the <br />landfill property in the northern “mitigation zone.” <br />NPDES Stormwater Monitoring <br />Stormwater will be sampled where it leaves the site or where it enters the “Waters of the State” <br />at the site. These points include discharge into the Paddy Creek system at two locations, and <br />discharge from the site to neighboring properties to the south and west (Figure 3 and <br />Drawing 1). These discharge points are consistent with the discharge points established in the <br />original PC/PMP (1990) based on historical stormwater flow patterns. <br />Unsaturated Zone <br />The purpose of unsaturated (vadose) zone monitoring is to detect leachate leaks through the <br />liner systems. The unsaturated zone monitoring network consists of one background monitoring <br />station, VZ-1, and seven point-of-compliance monitoring stations, VZ-2 through VZ-8. It is <br />anticipated that an additional 12 monitoring stations would be required for future area <br />developments, for a total of 20 stations. Semiannual monitoring, and testing of moisture or gas <br />in the unsaturated zone monitoring devices if detected, is included. This number of anticipated <br />stations forms the basis for the postclosure maintenance cost estimate. <br />2.5.9 Site Security <br />The landfill site is secured by a barbed wire perimeter fence and a main entrance gate on <br />Harney Lane, which is located on the north side of the facility (Figure 3). This gate is locked <br />during non-operating hours. Similar fencing security will be maintained during the postclosure <br />period. <br />2.5.10 Construction Quality Assurance <br />Section 21790(b)(8)(C), requires a preliminary description of quality assurance methods <br />pursuant to Sections 20323 and 20324 for closure activities. Section 20323 requires <br />construction of final cover systems to be executed in accordance with a Construction Quality <br />Assurance (CQA) Plan certified by a registered professional. Section 20324 presents <br />requirements for the CQA Plan. <br />CQA Manuals for closure construction will be developed for the individual partial closure <br />projects in compliance with Section 20324 and will be submitted for review concurrent with the <br />Partial Final Closure Plans. Preliminary construction drawings and specifications for the major