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All site surface water that has not come in contact with waste is directed to the sedimentation ponds. Water collected in the sedimentation ponds is sampled in accordance with the site's Stormwater Pollution Prevention Plan (SWPPP) before it is discharged to the North Branch of the South Fork of Little Johns Creek. Surface water monitoring is completed quarterly at both the existing Austin Road and Forward Landfills in accordance with each site's WDR's. Lysimeters — As with the existing lined cells at the Forward Landfill, all lined cells in the Forward Landfill expansion will incorporate a lysimeter below the liner system in order to monitor for potential leakage through the liner system. The landfill operator is required to monitoring the lysimeters in accordance with the site WDRs in order to provide early detection capability in the event of release. Groundwater Monitoring - Expansion of the existing Forward and Austin Road Landfills into a single landfill facility will necessitate changes to the current groundwater monitoring programs at these sites. The proposed monitoring well network will include 45 wells; 12 for post -closure monitoring of -A, 22 additional wells for the Detection Monitoring Program (DMP); and 11 wells to monitor the effectiveness of the Corrective Action Program (CAP) north of the existing Austin Road parcel. Of the 45 wells, 9 wells have not yet been constructed, but are proposed to meet DMP and CAP monitoring requirements. Several monitoring wells will also need to be abandoned to accommodate the expanding landfill footprint. All well abandonment work will be described first in a work plan that will be prepared under the supervision of certified 0 (geologist or civil) engineer who will also direct all field activities. The landfill operator is required to monitor the groundwater monitoring system for site monitoring parameters on a quarterly basis in accordance with the site WDRs. In addition, groundwater samples are required to be periodically analyzed for the more extensive suite of "Constituents of Concern" (COCs). Leachate Monitoring - During the operational life of the landfill, through closure and the post -closure maintenance period, the leachate collection system will be regularly sampled and analyzed for a variety of inorganic and organic constituents to evaluate whether or not the landfill is impacting groundwater. Leachate monitoring and sampling is completed at the existing Forward Landfill in compliance with WDR Order No. 97-141. Since the existing Austin Road Landfill is unlined, no leachate monitoring is performed at the site. Quarterly and annual reports of the monitoring results are submitted to the LEA, DTSC, and RWQCB. The leachate monitoring program consists of weekly inspections of the LCRS sumps for the presence of leachate, with the exception of WMU A which is inspected semiannually in accordance with DTSC and USEPA post -closure permits. If leachate is detected then monitoring continues on a daily basis, If leachate is present, the sumps are pumped and the leachate is disposed at the on-site leachate evaporation pond. The quantity of leachate pumped from each sump is also measured and reported to the RWQCB on a quarterly basis. 5H C:\2000 49\Fom®rd Composite Uner V3 .doc\091I9/02 Geologic Associates