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thick compacted clay liner with a maximum permeability of 1 x10' cm/sec or a <br /> GCL overlain with a 60-mil HDPE geomembrane (see Section 5.2.2 for additional <br /> information). <br /> 7.2.2 GROUNDWATER MONITORING WELLS <br /> 7.2.2.1 EXISTING GROUNDWATER MONITORING NETWORK - <br /> The groundwater monitoring network at the existing Forward and Austin Road <br /> Landfills have been designed to provide early detection of a release from wastes to <br /> groundwater. The monitoring systems currently installed were designed and <br /> certified by a registered (geologist or civil) engineer. The boring logs were <br /> prepared under the direction of a registered (geologist or civil), °gineer :have <br /> been submitted to the RWQCB. <br /> At the existing Forward Landfill, the groundwater monitoring network currently <br /> includes 19 groundwater wells, with 10 of the monitoring wells positioned in well <br /> pairs (e.g., MW-1 A, MW-1 B) to accommodate fluctuating groundwater elevations <br /> in the area. The groundwater monitoring wells were typically constructed to <br /> depths between s70 and 110 feet. Seven of the monitoring wells are included in <br /> the post-closure monitoring program that was implemented following closure of <br /> WMU-A near the northeast corner of the facility. The remaining 12 wells are <br /> included in'the-landfill's Detection Monitoring ProgramIMonitoring°& Reporting <br /> Program [M&RP] Order 97-141). The locations of the existing_monitoring wells are <br /> depicted on Figure 7. Table 15 lists the wells and ideritifies their current,and <br /> anticipated future uses. <br /> The groundwater monitoring network at the existing Austin Road Landfill includes <br /> 13 groundwater monitoring wells that have been installed in accordance with the <br /> facility's M&RP (Order 98-121) around the perimeter of the facility and within the <br /> plume of impacted groundwater that extends north and northeast of the landfill. <br /> The groundwater monitoring wells were typically constructed to depths between <br /> 80 and 100 feet. The locations of the existing monitoring wells are depicted on <br /> Figure 7. Table 16 lists the wells and identifies their current and anticipated future <br /> uses. <br /> Forward Landfill JTD 7-4 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-7.0.doc:08/21/01 BRYAN A.STIRRAT&ASSOCIATES <br />