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intended to be performed annually over the contract term to maintain compliance with permit conditions and <br />agency requirements. <br />Subtask 2.'t * Envirnnniental lvlnnitoring Fieidwork <br />Activities <br />r Groundwater and Spring Monitoring {LPL and Balefitl) <br />o LPL: Sample three groundwater wells and one spring quarterly per WAC L73-350-500. <br />o Balefill: Sample five groundwater wells and one spring semiannually (first quarter (Q1) and third <br />quarter (a3)) and one groundwater well quarterly (Q1, Q2, Q3, and Q4) per WAC 173-351'-400. <br />o Measure depth-to-water and document field conditions at each location. <br />r Leachate Monitoring (Balefill) <br />o Collect one annual leachate sample from the collection tank in Q1 per WAC 173-350-500. <br />o coordinate with laboratory for analyses specified in the approved plan. <br />. LFG Monitoring (LPL and Balefill) <br />o Perform quarterly ambientfnear-surface perimeter monitoring at LPL LFG monitoring points <br />(GM-1to GM-8) and Balefill LFG monitoring points (GMB-1to GMB-9) per WAC 173-351'200 <br />and the LFG Monitoring Plan. <br />o Perform quarterly gas vent monitoring at 26 gas vents at the Balefill Landfill' <br />o Document field readings, weather conditions, and any exceedances; and initiate follow-up <br />actions if required by the LFG Monitoring Plan' <br />o Field Coordination and Documentation <br />o Coordinate all sampling with County staff and the reporting team as described in Subtask 2.2. <br />o Procure containers, calibrate instruments, and ensure proper chain-of-custody for all samples. <br />o Deliver samples to a certified laboratory for analysis. <br />Deliverables <br />r Field data sheets, water level logs, LFG monitoring logs, and chain-of-custody forms for each sampling <br />event. <br />. Exceedance docurnentation when applicable. <br />Assumptions <br />. All quarterly sampling will be performed during a single mobilization when feasible. <br />r HWA Geosciences will complete quarterly groundwater monitoring through the fourth quarter of 2A25, <br />Parametrix will take over quarterly groundwater monitoring in the first quarter of 2026' <br />. No new wells, probes, or monitoring points will be added unless separately authorized- <br />Kittitas County Agreement for Services (rev. 5/t4/25) <br />Page 5 of 28