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Water Quality Monitoring Report <br />First Quarter 2024 <br />www.arcadis.com <br />Forward Landfill 1Q24 Water Quality Mon Report_05012024 5 <br />MW-2A. Nitrate as N and sulfate. <br />MW-3. Nitrate as N and sulfate. <br />MW-10. Nitrate as N. <br />MW-13. Nitrate as N and sulfate. <br /> MW-14 – Nitrate as N; <br />MW-16. Calcium, chloride, magnesium, nitrate as N, sodium, sulfate, and total dissolved solids. <br />MW-17R. Sulfate. <br />MW-19R. Bicarbonate alkalinity, calcium, magnesium, nitrate as N, and sulfate. <br />MW-21. Nitrate as N and sulfate. <br />As a result, these wells were identified for resampling in second quarter 2024. The RWQCB was notified of these <br />VOC detections and CL exceedances in a letter dated April 23, 2024 (Forward 2024b). <br />2.1.5 Detection Monitoring Program, Austin Road Unit <br />Field and laboratory results for the DMP samples collected at Austin Road Unit groundwater monitoring wells <br />during first quarter 2024 are presented in Tables 6 and 7, summarized below: <br />Non-statistical data analysis. The CNSDAM was performed for VOCs detected in the site monitoring wells <br />during first quarter 2024. As presented in Table 6 and shown on Figures 3, 11, and 12, the following VOCs <br />were detected at the Austin Road Unit: <br />-AMW-6. PCE (greater than PQL) and TCE (greater than MDL). <br />-AMW-12. PCE (greater than PQL). <br />Concentration limit thresholds. In accordance with the MRP (RWQCB 2014), the routine inorganic monitoring <br />data from the Austin Road Unit for first quarter 2024 were compared to CLs established for each well. CLs <br />were recalculated through fourth quarter 2022 (Arcadis 2023). Details on the statistical analysis for the <br />established CLs are presented in Appendix I to the Forward Landfill Water Quality Monitoring Report – Fourth <br />Quarter 2022/Annual (Arcadis 2023). <br />As presented in Table 7, the following CL was exceeded at the Austin Road Unit during first quarter 2024: <br />-AMW-5R. Sulfate. <br />As a result, this well was identified for resampling in second quarter 2024. The RWQCB was notified of this VOC <br />detection and CL exceedance in a letter dated April 23, 2024 (Forward 2024b). <br />2.1.6 Quality Assurance/Quality Control Results <br />The quality assurance (QA)/quality control (QC) samples collected at the Forward and Austin Road Units during <br />first quarter 2024 and the associated analytical results are described below.