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Geosyntec consultants 1. INTRODUCTION Geosyntec Consultants, Inc. (Geosyntec) has prepared this 2022 Groundwater Monitoring Work Plan (2022 GMWP) for Rough and Ready Island(RRI) located in Stockton, California (Figure 1) on behalf of the Port of Stockton(Port). This 2022 GMWP proposes a groundwater monitoring program for RRI for 2022 and presents a work plan to address outstanding data gaps in the RRI groundwater monitoring network at Site 3, Site 4, and the Central Area of RRI. Data gaps for the Landfill Area are not addressed in this GWMP, as preparation for construction activities for a soda ash terminal including a rail line is currently in progress. Data gaps in the groundwater monitoring network in the Landfill Area will be addressed in 2023 or 2024, depending on completion of the terminal facility. The previous Groundwater Monitoring Work Plan for RRI was submitted on June 1, 2018 (2018 GMWP) and approved by the California Environmental Protection Agency Department of Toxic Substances Control (DTSC) on June 19, 2018, and the Central Valley Regional Water Quality Control Board (CVRWQCB) on June 25, 2018 (Geosyntec, 2018a; DTSC, 2018; CVRWQCB, 2018a). Three addendums to the 2018 GMWP were submitted between 2019 and 2021 to address changes to the monitoring program requested by DTSC and CVRWQCB after approval of the 2018 GMWP (Geosyntec, 2019; Geosyntec, 2020a; Geosyntec, 2021a). The work proposed in the 2018 GMWP and subsequent addendums to the 2018 GMWP was implemented between 2018 and 2021. Work implemented included annual groundwater monitoring, sampling surface water drainage channels to determine if groundwater was discharging to surface water, re- surveying the groundwater monitoring well coordinates and top of casing elevations, locating and assessing monitoring well conditions, collecting grab-groundwater samples at 30 locations to address data gaps, and installing 11 new groundwater monitoring wells. In response to the third addendum to the 2018 GMWP, the CVRWQCB requested a new Groundwater Monitoring Work Plan be prepared for RRI (CVRWQCB, 2021). In response to CVRWQCB's request for a new work plan, the Port agreed to prepare a 2022 GMWP to replace the 2018 GMWP. A response to comments documenting which sections of the 2022 GMWP address the CVRWQCB comments on the third addendum to the 2018 GMWP, or the reason why the comment is not applicable to the 2022 GMWP, is provided in Appendix A. This 2022 GMWP proposes a groundwater monitoring program for RRI in 2022, and includes a work plan to address outstanding groundwater monitoring data gaps at Site 3, Site 4, and the Central Area. Due to the construction and soil remediation activities that are planned to be conducted in the Landfill Area, this 2022 GMWP is intended to cover work planned in 2022 only, and is not intended to be a long term ongoing annual groundwater monitoring program work plan for RRI. 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 RRI Groundwater Monitoring Work Plan 1 June 2022