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Geosyntec O <br /> consultants <br /> Description of Surrounding Property/Population: <br /> North: <br /> Agricultural Fields East: City of Stockton <br /> South: <br /> Agricultural Fields West: Agricultural Fields <br /> Summary of Previous Site Investigations: <br /> There have been extensive groundwater and soil investigations at the Site for the past 30 years. <br /> In addition, there have been groundwater monitoring programs in place. The primary <br /> constituents of concern(COCs) consist of volatile organic compounds (VOCs), metals, TPH, <br /> and pesticides. <br /> For VOCs in groundwater, cis-1,2-dichloroethene (cis-1,2-DCE) and vinyl chloride (VC) are <br /> the primary COCs across the Site. Based on groundwater monitoring results collected between <br /> 2018 through 2022, cis-1,2-DCE concentrations range from non-detect to 5,400 micrograms <br /> per liter(gg/1) and VC concentrations range from non-detect to 2,100 gg/1. Benzene is <br /> additionally considered a COC in groundwater in the Central Area. Concentrations of benzene <br /> in the central area range from non-detect to 85 gg/1. <br /> In addition, based on groundwater data collected between 2018 through 2022, the following <br /> COC concentration ranges exist: <br /> • California Assessment Manual (CAM) 17 Metals: non-detect to 2.7 miligrams per liter <br /> (mg/1). <br /> • TPH: non-detect to 4,700 gg/1. <br /> • Pesticides: non-detect to 0.04 gg/1. <br /> Port of Stockton HASP A-1 05.01.2025 <br />