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3 MONITORING AND LANDFILL GAS CONTROLGroundwater and Surface Water MonitoringComponents: Quarterly Groundwater Monitoring at 8 wells plus two stormwater outlet locations.Annual Sampling, Testing, and Reporting sample 6,590$ 24 158,160$ Subtotal, Annual Monitoring Cost 158,160$ Five-Year Monitoring and Report of Constituents of Concern AnalysisComponents: This is a five year requirement that is included above. LS -$ 1 -$ Subtotal, Five-Year Monitoring -$ Annual Cost, 1/5 -$ Groundwater Monitoring Well RepairsComponents: Well Repairs, including replacement of the protective steel covers twice over 30 yrs. on all groundwater monitoring wells.Steel Covers ea. 100$ 24 2,400$ Keyed-alike Locks ea. 25$ 24 600$ Misc. Supplies (i.e. cement, paint, etc.) ea. 250$ 24 6,000$ Field Technician(Environmental Specialist) hr. 153.00$ 7211,016$ Project Manager/Engineer/Geologist hr. 224.00$ 163,584$ Subtotal Groundwater Well Maintenance and Repairs 23,600$ Landfill Gas MonitoringComponents: Quarterly Landfill Gas Monitoring and Reporting Surface Emission Monitoring ls 69,831$ 169,831$ Sampling and Reporting ls 7,201$ 17,201$ Testing ls 9,053$ 19,053$ Subtotal, LFG Monitoring Event 86,085$ Landfill Gas System Operation and MaintenanceComponents: Annual system and monitoring probe maintenance and repairs.Landfill Gas System Maintenance and Operation ls 1,812,995$ 1 1,812,995$ Subtotal Landfill Gas System Maintenance and Operation 1,812,995$ Vadose Zone MonitoringComponents: Annual Vadose Zone Monitoring and Reporting Sampling and Reporting ea. 163$ 20 3,260$ Testing ea. 259$ 20 5,180$ Subtotal, Vadose Zone Monitoring Event 8,440$ Total Cost for Monitoring and Landfill Gas Control 2,112,880$ Foothill Sanitary Landfill Prelim Closure-Postclosure Cost Estimate August_2025_Final.xlsx Page 11 of 15