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As provided for in Subchapter 15, Section 2559(x) , the unlined Class III North County Sanitary Landfill will not be required to install vadose-zone monitoring. Subsurface monitoring will focus on ground water. The ground-water monitoring program presented below will be in effect (1) during the active life of the landfill , (2) during the site clo- sure, and (3) for as long as waste at the facility poses a potential threat to ground-water quality, according to Subchapter 15, Sec- tion 2580(a) . The design of this monitoring program is based on current knowledge of the hydrogeology of the site and vicinity. During installation and monitoring of the proposed well system, new hydrogeologic data will be generated. If the data significantly change the current hydrogeologic model of the site, portions of the proposed monitoring program may have to be amended. Should that happen, an amendment to this plan describing proposed modifications will be submitted to the California Regional Water Quality Control Board (RWQCB) . A. WELL LOCATIONS The proposed ground-water monitoring system focuses on the two initial fill modules (see Figure 5) . These modules have a total of approxi- mately 6 years of fill capacity. The system incorporates the two existing ground-water monitoring wells (G-1 and G-2) , plus one pro- posed new well (G-3) . The locations of the existing and proposed wells are shown on Figure 5. The locations of the new well is approx- imate; it may be necessary to change the location slightly to conform with construction or operation activities. The well locations were selected to provide a sufficient number and coverage of wells to yield ground-water samples that represent both background water quality, as well as the quality of water passing the points of compliance. PJ9 9390207.00D 10