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that the estimated soil loss would be approximately 1.7 tons per acre per year which is a <br />reasonable number showing good control of soil erosion. This value is less than the USEPA's <br />maximum allowable soil loss of 2 tons per acre per year (Subappendix B). <br />2.5 Environmental Monitoring <br />Environmental monitoring systems in conformance with Title 27 at FSL include groundwater <br />monitoring wells, landfill gas probes, and surface water monitoring points. <br />2.5.1 Groundwater <br />Currently the landfill has three groundwater monitoring wells, as follows: <br />• MW -1 (cross -gradient) in the proposed refuse footprint, removed during the <br />development of Module 8 <br />• MW -4 (up -gradient) <br />• MW -5 (down -gradient) <br />As new modules are constructed, new groundwater monitoring wells will be added as determined <br />by the Regional Water Quality Control Board, and interior wells such as MW -1 will be <br />decommissioned. <br />Proposed final groundwater monitoring includes three up -gradient wells (MW -4, -8, and -9) and <br />three down -gradient wells (MW -5, -6, and-7)(JTD Figure 16). Actual number and location of <br />the groundwater monitoring wells at closure will be controlled by factors such as regulatory <br />input, changing regulations, and future patterns of detections of constituents in groundwater, if <br />any. <br />For estimating closure and post closure maintenance costs, it is assumed that these wells will be <br />installed along with the adjacent modules, and will not be part of closure construction. Cost of <br />maintenance is included in the Postclosure Maintenance Cost. <br />2.5.2 Landfill Gas (LFG) Migration Monitoring and Control <br />LFG migration is presently monitored at 25 landfill gas monitoring probes at FSL (SG -12 <br />through SG -125, JTD Figure 16). Well SG -12 will be replaced with the development of the <br />landfill prior to closure. No additional perimeter migration monitoring wells will be needed at <br />closure (JTD Figure 16). <br />2.5.3 Landfill Gas Surface (LFG) Emissions <br />LFG surface emissions will be controlled in accordance with the requirements of the air quality <br />requirements in applicable at that time. Presently, the San Joaquin Valley Air Pollution Control <br />Foothill Sanitary Landfill B-7 Public Works/Solid Waste <br />Preliminary CPCM Plan County of San Joaquin — Rev July 2010 <br />