3815_PGSF WMVD Pkg 2_Vol 4-2_03.03.2026_BXWA_Certified

ASPECT CONSULTING 56 FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 Work Plan (Landau, 2021b; 2021 IA Work Plan), which included a Soil and Groundwater Management Plan to outline procedures for managing soil, groundwater, and stormwater during implementation of the third IA, and Interim Action Work Plan Addendum No. 1 (Landau, 2022a). The third IA consisted of site grading, cap construction, utility installation, outfall reconstruction, soil and groundwater management, and security fencing installation. Site grading included importing, grading, and compacting clean fill to support construction of the low-permeability cap, which was designed to reduce surface water infiltration and prevent terrestrial ecological exposure to contaminated soil. The low- permeability cap is constructed of 9 inches of asphalt pavement (Landau, 2024). During the earthwork, subgrade utilities were installed to minimize future disturbance of the cap. The IA included construction of a new stormwater drainage and conveyance system integrated into the environmental cap, a new chitosan-enhanced sand filtration treatment system for stormwater, and reconstruction of existing stormwater outfalls A and M for discharge of the treated water to the East Waterway. The Site was previously fenced, but the Port required that upgraded security fencing be installed to support the MIE project. The third IA was successfully completed in May 2023. The construction report for the third IA is included in Appendix A. .