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Geospte& consultants activities have been obtained. The Port will provide progress updates as its development partner (Denmar US LLC)begins their rail line construction. 2.1 Well Location Activities Geosyntec's proposed approach for locating the wells with this activity proposed in 2024 on Table 1 is to: • Coordinate with the Port to schedule vegetation clearance around wells that are currently inaccessible, as needed. • Use hand tools to excavate at the historical survey coordinates when soil is present at the ground surface at the survey location to attempt to locate the wells. This hand excavation will be to a maximum of a 3-foot radius and a 2-foot depth below ground surface (bgs). • If the well is unable to be located with the hand excavation, the location will be excavated using a backhoe or similar equipment to a maximum 5-foot radius and a 4-foot depth bgs to attempt to locate the well. If the well is unable to be located after clearing a 10- by 4- foot hole around the historical survey coordinates, the DTSC and the CVRWQCB will be notified that the well could not be located. Once a well has been located, it will be gauged for total depth and depth to water. If the well is undamaged, the status of the well condition will be updated. If the well located is damaged, the extent of the damage will be evaluated. A total of 9 groundwater monitoring wells and piezometers (W-299, W-300, W-318, P-166, P- 167, B 16-MW6, B 16-MW7, 120-MW-1, W-270) were not able to be located during 2023 well maintenance activities are located beneath various infrastructure such as railways or buildings based on the well coordinates and further attempts to locate these wells are not planned in 2024. Additionally, two groundwater monitoring wells (W-274 and W-275) are located beneath a stockpile of material, based on surveyed coordinates, and further attempts to locate and recover the wells are not planned in 2024. 2.2 Well Repairs Wells that are damaged within the top 4 feet of the ground surface and repairable, such as wells that have a cracked well box, missing well cap, or missing well box lid, will be repaired. The well repairs will be conducted by a C-57 licensed drilling contractor working under the supervision of a California licensed professional geologist. Wells that are proposed to be repaired in 2024, with the planned repairs are listed on Table 1. 2.3 Other Well Maintenance Activities Other well maintenance activities planned for 2024 include surveying the top of casing for wells repaired in 2023 where the repairs changed the well casing height, installing QR codes inside RRI 2024 Groundwater Monitoring Work Plan 9 June 13,2024