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Quarterly Monitoring Report— First Quarter 2026 The last day cannery waste was applied was October 31, 2023; cannery waste is no longer applied at the Site. The groundwater monitoring discussed in Sections 4.3.1 will continue under the post-closure requirements listed in the MRP (RWQCB 2024) or until approval to cease monitoring is granted by the RWQCB. A request to cease monitoring will be submitted to the RWQCB following eight sampling events, as required by the MRP. Seven sampling events have been conducted since cannery waste land application ceased. 4.3.1 Cannery Waste Land Application Area Groundwater Monitoring Program Under MRP Section D.3.c (RWQCB 2024), alternative shallow groundwater monitoring wells were selected for the CWLAA monitoring network to detect levels of waste constituents. The four shallow groundwater monitoring wells are AMW-14, AMW-44, AMW-45, and AMW-46. Groundwater monitoring wells AMW-44, AMW-45, and AMW-46 are considered to be hydraulically downgradient and are located on the northern edge of the CWLAA. Groundwater monitoring well AMW-14 is also a downgradient well but is located approximately 775 feet northeast of the CWLAA. Results of the waste constituents for the alternative wells are presented in Table 9. In accordance with MRP Section D.3.d, the CWLAA monitoring wells are sampled quarterly for total Kjeldahl nitrogen, nitrate, nitrite, total nitrogen, iron, and manganese (in addition to the monitoring parameters outlined in MRP Tables 2 and 3 [RWQCB 2024]). 4.3.2 Quarterly Results The monitoring results for the CWLAA monitoring wells (AMW-14, AMW-44, AMW-45, and AMW-46)for first quarter 2026 are summarized in Table 9. The water quality protection standards for the CWLAA constituents (total Kjeldahl nitrogen, nitrate as NO3, nitrite as NO2, total nitrogen, iron, and manganese)were due to be recalculated in fourth quarter 2024 using data collected through third quarter 2024. Due to a lack of historical data available for the CWLAA monitoring wells, the water quality protection standards (WQPS) have not been calculated for any of the CWLAA constituents. The WQPS will be recalculated in fourth quarter 2026 when enough historical data is collected. 4.4 Site Monitoring This section describes the types and quantities of waste handled at the Site during first quarter 2026, standard observations conducted for the Site, and compost facility monitoring, and provides an update regarding site compliance. Site inspections are conducted in accordance with MRP Section DA (RWQCB 2024). 4.4.1 Waste Types and Quantities The types and quantities of waste handled at the Site during first quarter 2026 are summarized in Table 4-2 below. Documentation of waste types and quantities is included in Appendix E. The compost facility is discussed in more detail in Section 4.4.3, and the surface impoundments are discussed in more detail in Section 4.1.3. www.arcadis.com Forward Landfill 1Q26 QMR 10