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Foothill Sanitary Landfill Preliminary Closure Plan <br /> Revision #1 May 6, 1994 <br /> medium similar to a laver of gravel. A dendritic leachate <br /> collection system below the geonet will collect any leachate <br /> produced and direct it into a tank or sump for extraction. <br /> Quantity and quality of leachate in the sump will be monitored in <br /> accordance with the waste discharge requirements program 91-020 <br /> (Appendix A) . Leachate will be filtered with a County-owned <br /> filtering system. <br /> It is expected that very little leachate will be produced because <br /> the low permeability soils that will be used for final cover <br /> should provide a substantial barrier to precipitation and <br /> infiltration. Also, since the area averages only 15 inches of <br /> rainfall per year, very little water should reach the wastes to <br /> produce leachate. <br /> Leachate monitoring and chemical analysis results will be <br /> submitted in a report to the LEA, CIWMB, and the RWQCB within <br /> ninety days of the monitoring event. <br /> A Quality Assurance/Quality Control (QA/QC) plan will be <br /> developed and submitted to the LEA for approval. The plan will <br /> insure that only accredited laboratories will be used for <br /> analysis. The chosen laboratory will provide a QA/QC plan to the <br /> County to insure accurate and repeatable results including sample <br /> collection, sample preservation, and chain of custody control. <br /> INSTALLATION OF GROUNDWATER MONITORING NETWORX <br /> The groundwater monitoring network is already in place at the <br /> landfill site. The network currently consists of one upgradient <br /> monitoring well (MW-1) , one downgradient monitoring well (MW-2) , <br /> and a water supply well (LW-1) that is being utilized as a <br /> downgradient monitoring point (Figure 3) . More monitoring wells <br /> will be added as the landfill is developed. The wells are <br /> equipped with individual dedicated pumps which are used for <br /> sampling. <br /> INSTALLATION OF LANDFILL GAS MONITORING SYSTEM <br /> At this time, a gas control system is not in place at the <br /> landfill site. However, at the time of closure, a gas monitoring <br /> system will be installed. The monitoring system will consist of <br /> a series of gas monitoring wells placed around the perimeter of <br /> the landfill. The perimeter wells will be spaced no more than <br /> 1000 ft. apart. <br /> 16 <br />