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Geosynte& consultants 1. INTRODUCTION Geosyntec Consultants, Inc. (Geosyntec) has prepared this 2024 Groundwater Monitoring Work Plan (2024 GMWP) for Rough and Ready Island(RRI) located in Stockton, California (Figure 1) on behalf of the Port of Stockton(Port). This 2024 GMWP proposes a groundwater monitoring program for RRI for 2024. Groundwater monitoring has been conducted at RRI for over 30 years. Groundwater monitoring work implemented by Geosyntec during the last 6 years between 2018 and 2023 included the following: • annual groundwater sampling and gauging; • locating and assessing monitoring well conditions; • repairing and installing protective measures for monitoring wells; • re-surveying the groundwater monitoring well coordinates and top of casing elevations; • destroying 15 monitoring wells and piezometers that were damaged beyond repair; • destroying 60 monitoring wells located in the Stockton Soda Bulk Export Terminal (previously referred to as soda ash terminal) construction area; • collecting grab-groundwater samples at 30 locations to address data gaps; • installing and sampling 14 new groundwater monitoring wells; • assessing and determining that stream gauges installed by the Navy are no longer present at RRI; and, • sampling surface water drainage channels to determine if groundwater was discharging to surface water. In consultation with the Central Valley Regional Water Quality Control Board(CVRWQCB) and the Department of Toxic Substances Control (DTSC), the Port has proposed a groundwater monitoring program to collect groundwater data to address data gaps for preparing remedial investigation/feasibility studies (RI/FS) for the proposed groundwater operable units at RRI. This 2024 GMWP is intended to cover groundwater monitoring work planned in 2024 only. The proposed groundwater monitoring program for 2024 and proposed groundwater operable units, described in this GMWP, were presented to the CVRWQCB and DTSC during a meeting on March 27, 2024. 1.1 Background RRI is approximately 1,459 acres and is located within the Sacramento-San Joaquin River Delta (Delta) at the confluence of the San Joaquin, Sacramento, Mokelumne, Calaveras, and Cosumnes Rivers. Formerly a riverine marshy grassland, RRI was transformed into farmland in the late 1800s with the construction of levees and implementation of a drainage system along the perimeter and throughout the interior of the island (Figure 2). Military use of the island started after World War I, when a United States Army camp was established(PRC Environmental Management, Inc. [PRC], 1997a). The island was then developed as a supply depot during World War II and was commissioned as the United States Naval Supply Annex, Stockton, on June 30, 1945 (PRC, 1997a). The area was then re-designated as the Naval Communication Station in 1965 following the establishment of their headquarters on the island in 1960 (PRC, 1997a). The RRI 2024 Groundwater Monitoring Work Plan 1 June 13,2024