2025-03-11-minutes-solid-waste-and-maintenance

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Ryegrass Limited Purpose Landfill and Salefill Closed Landfill Groundwater and Leachale Sampling and Analysis Plan KIthlaa County Solid Waste Samples will be stored at 4 to 6°C, in an enclosed cooler or dedicated refrigerator where possible, before transport to the laboratory. Samples will be submitted to the laboratory daily if possible to ensure proper temperature control and that holding time requirements are met. 2.4 Analytical Constituents and Procedures Monitoring for the LPL is completed quarterly at monitoring wells B3 and B7 and the Clerf #4 spring in accordance with WAG 173-350-400 and the SAP (HWA 2020). B3, B7, and Clerf #4 will be analyzed for WAC 137-350-500 parameters (see Table 1). Monitoring for the Balefill Landfill is completed at wells B2 (deep), B3, B4, B5, and B6 and Poison Spring on a semi-annual basis in accordance with the Post -Closure Monitoring Plan (HWA 2018). B2, B3, B4, B5, 66, Poison Spring and leachate samples will be analyzed for WAC 173-351430 parameters and WAC 173-351-990 Appendix I and Appendix II parameters (see Table 2). Table 5 presents the analytical methods for the planned groundwater analyses and includes the applicable groundwater quality criteria (Chapter 173-200 WAC) for each parameter. All samples will be sent to an accredited laboratory for analyses in accordance with Chapter 173- 50 WAC, Accreditation of Environmental Laboratories. The laboratory will analyze the water samples for the constituents listed on Table 5, using the methods listed or equivalent/updated methods. Quantitation limits (QLs) will be below applicable groundwater quality criteria, if possible, using conventional analytical methods. Quality control checks and decision criteria for determining If an analysis is within quality control requirements will foilowthe quality control procedures and guidelines listed in SW-845 (EPA 2018), Where appropriate, these procedures may be modified based on anticipated data uses and with recognition of validation requirements, to incorporate techniques familiar to the project laboratory. The laboratory will notify the Project Quality Assurance (QA) Officer of any proposed procedural changes and document these changes in the cover letter with the data reports. Matrix interferences may make achievement of the desired detection limits and associated quality control criteria impossible. In such instances, the laboratory must report to the Project QA Officer the reason for noncompliance with quality control criteria or elevated detection limits. 2.5 Field Documentation and Chain -Of -Custody The following sections describe the recording system for documenting all Site field activities, and the sample chain -of -custody procedures. 2.5.1 Field Documentation An accurate chronological recording of all field activities is vital to the documentation of any environmental investigation. To accomplish this, field team members will maintain field log books and data sheets providing a daily record of significant events, observations, deviations from the sampling plan and measurements collected during the field activities. April 2024 1 553-1763-010 2-4 Revised May 2024