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Leachate will be collected and handled according to a leachate disposal plan to be prepared at a later date. The LCRS to be installed is not specified here because alternatives to the prescriptive standard will be proposed for approval prior to module construction. However, the LCRS design will generally consist of a dendritive network of perforated pipes wrapped in pea gravel, covered by a geonet layer, a geotextile layer, and a two foot operations soil layer. A general cross section detail of the base liner is shown on Figure 10. Any excess liquid in the refuse fill will flow through the drainage material to the perforated pipes, which will serve as conduits to the perimeter sumps. The sump will be pumped as necessary by an automatically controlled leachate removal system. 11. 0 GROUND WATER MONITORING A ground water monitoring system currently exists at the Foothill Sanitary Landfill. The system consists of three ground water monitoring wells (MW-1, MW-2 , MW-3) . Monitoring wells MW-1 and MW- 2 were constructed by Kleinfelder Inc. in July 1989 . Monitoring well MW-3 was constructed by EMCON in December 1994. Construction details for all three wells are shown on Table 6. The locations of these wells are shown on Figure 11. Figure 12 is a cross section showing general well construction details. A monitoring program began in 1989 following the construction of the monitoring wells. The monitoring program is in accordance with Waste Discharge Requirements # 94-258 (Appendix F) issued by the Regional Water Quality Control Board (RWQCB) . The wells are monitored quarterly and annually by a consultant, and the results of the monitoring are submitted to the RWQCB. Monitoring parameters and frequency are listed in the attached Waste Discharge Requirements under "GROUND WATER MONITORING" . Additional monitoring wells may be installed as the landfill progresses to provide adequate groundwater monitoring. Sampling and analysis procedures for ground water monitoring are taken from the current consultant for ground water monitoring, and are included as part of Appendix A. Well logs are listed in Appendix G. Results from monitoring of the three wells show that groundwater quality is excellent. As shown on figure 11, the ground water gradient is to the south-southwest based on water level data acquired from the three on-site wells. This data is taken from the July 1994 monitoring report. 28