Laserfiche WebLink
Geosyntec <br /> consultants <br /> 1. INTRODUCTION <br /> Geosyntec Consultants, Inc. (Geosyntec) has prepared this 2025 Groundwater Monitoring Work <br /> Plan (2025 GMWP) for Rough and Ready Island(RRI) located in Stockton, California(Figure 1) <br /> on behalf of the Port of Stockton (Port). This 2025 GMWP proposes a groundwater monitoring <br /> program for RRI for 2025. <br /> Groundwater monitoring work implemented by Geosyntec during the last 7 years, between 2018 <br /> and 2024, included the following: <br /> • Annual groundwater sampling and gauging <br /> • Locating and assessing monitoring well conditions <br /> • Repairing and installing protective measures for monitoring wells <br /> • Resurveying the groundwater monitoring well coordinates and top of casing elevations <br /> • Destroying 20 monitoring wells and piezometers that were damaged beyond repair <br /> • Destroying 60 monitoring wells located in the Stockton Soda Ash Port LLC Rough and <br /> Ready Island Terminal (previously referred to as soda ash terminal) construction area <br /> • Collecting grab-groundwater samples at 30 locations to address data gaps <br /> • Installing and sampling 15 new groundwater monitoring wells <br /> • Assessing and determining that stream gauges installed by the United States Navy are <br /> no longer present at RRI <br /> • Sampling surface water drainage channels to determine if constituents of concern <br /> (COCs) in groundwater were discharging to surface water <br /> In 2024,the Port implemented a groundwater monitoring program that collected groundwater data <br /> to address data gaps for preparing remedial investigation/feasibility studies (RDFS) for the <br /> groundwater operable units (OUs). The scope outlined in this 2025 GMWP will support the Port's <br /> objective of preparing an RI/FS for each OU by continuing to monitor groundwater concentration <br /> trends for the contaminant plumes. This 2025 GMWP is intended to cover groundwater monitoring <br /> work planned in 2025 only. <br /> 1.1 Background <br /> RRI is approximately 1,459 acres and is located within the Sacramento-San Joaquin River Delta <br /> (Delta) at the confluence of the San Joaquin, Sacramento, Mokelumne, Calaveras, and Cosumnes <br /> Rivers.Formerly a riverine marshy grassland,RRI was transformed into farmland in the late 1800s <br /> with the construction of levees and implementation of a drainage system along the perimeter and <br /> throughout the interior of the island(Figure 2). Military use of the island started after World War <br /> I,when a United States Army camp was established(PRC Environmental Management,Inc. [PRC] <br /> 1997a). The island was then developed as a supply depot during World War II and was <br /> commissioned as the United States Naval Supply Annex, Stockton,on June 30, 1945 (PRC 1997a). <br /> The area was then re-designated as the Naval Communication Station in 1965 following the <br /> RRI 2025 Groundwater Monitoring Work Plan 1 May 2025 <br />