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04ARCADIS SAMPLING AND ANALYSIS PLAN Water quality monitoring and sampling for the Forward Landfill located within the Central Valley RWQCB Region was conducted by Del-Tech geotechnical support services (Del-Tech), in accordance with WDR Order No. R5-2024-0002 issued specifically for the Forward Landfill. This sampling and analysis plan describes the methods and procedures used to collect water quality samples at the Forward Landfill. Laboratory Analytical Methods Chemical analyses were performed by Pace Analytical, a state-certified laboratory. Groundwater, surface water, leachate, and lysimeter samples were analyzed for the list of parameters summarized in Table 1, which also presents the laboratory analytical methods used during the sampling event. Copies of the certificates of analyses and Chain-of-Custody records for the samples collected this quarter are included with the analytical reports in Appendix C. Well Purging and Sampling The following sampling protocols listed below were generally followed during groundwater sampling operations: • Upon arrival at the wellhead, each monitoring point was inspected for evidence of tampering and/or vandalism, and the well identification (I.D.) was recorded. • The water level was measured directly using a weighted water-level indicator (sounder) to an accuracy of 0.01 foot. Prior to measuring the water level, the sounder was decontaminated using an Alconox® soap solution, followed by two rinses with deionized water. The wells were then sounded and the initial water level and the total depth of the well (if obtainable) were recorded on a Well Data Sheet. Groundwater Sampling Using Traditional Well Sampling Methods For the Forward Unit wells, Austin Unit wells equipped with Waterra sampling equipment, and for wells sampled with non-dedicated sampling equipment, groundwater sampling was performed using traditional well sampling methods described below. • Each well with sufficient recharge was purged of a minimum of three casing volumes and allowed to recover to 80 percent of the original well volume prior to sampling. Based on the measured depth to water, the total depth of the well, and the known casing diameter, a well casing volume was calculated using the following equation: CV = (7r) (CD/2)' (HW)(7.48) where: CV = casing volume (gallons) CD = casing diameter (feet) HW = height of water column within well (feet) 7.48 = conversion from cubic feet to gallons.