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18 It is also anticipated that the absorption capacity of the relatively dry refuse placed at the FSL, and the uptake of water in the production of landfill gas, will allow for the return of leachate over the lined modules for many years after closure. Inadequacy of those mechanisms, if it occurs, would be indicated by the inability of the leachate pumps to remove leachate from the leachate sumps to maintain less than 1 foot of liquid head over the liner. Monitoring of the leachate pumps and sumps will indicate that this condition is developing. If this occurs, leachate generated after placement of the final cover can be held in an onsite tank and then transported off site to an acceptable disposal site such as a wastewater treatment plant. 2.5.6 Surface Water Surface water runoff sampling will occur upstream and downstream of the creek flowing along the eastern property boundary (JTD Figure 16). 2.5.7 Storm Water Storm water will be sampled where the water leaves the property to the west and east (JTD Figure 16). There are currently two surface water monitoring points at the landfill, S-1 and S-2 (JTD Figure 16). These will be supplemented with additional points as required. 2.6 Closure Cost Estimate Closure costs for FSL are estimated to be approximately $26.65 million (2010 dollars) (Subappendix C Table 1). This cost includes all surfaces yet to be closed, and assumes that the top deck of Module "P' will be accepted as closed by the RWQCB. These costs reflect contractor (third party) construction costs as estimated by Shaw. Note that the FSL site setting is relatively aseismic as indicated in the seismic characterization (JTD Appendix F). The calculated PGA of 0.054g is unlikely to cause damage at the site and therefore no assessment of seismically -related damage has been performed. Foothill Sanitary Landfill tj-y Public Works/Solid Waste Preliminary CPCM Plan County of San Joaquin — Rev July 2010