Applicant’s engineer outlines step‑by‑step Baylands remediation: excavation, cap, vapor testing and ongoing reporting

Jay Marani, the senior engineer for the applicant’s remediation team, walked commissioners through the remediation program for the rail/railyard area and the broader Baylands site. Key steps include excavation and off‑site disposal of chlorinated volatile organic compound (CVOC) hot spots, placement of an approved clean imported fill blanket (variable depth up to 15–20 feet in the center), installation of a bright orange demarcation layer and a minimum five‑foot clean soil cap, and the use of surcharge fills to accelerate settlement prior to constructing roads and foundations.

Marani described construction quality assurance measures — continuous on‑site CQA consultants, weekly construction reports to agencies, and a construction completion report for DTSC or the Water Board that must be approved before subsequent development phases proceed. For vapor intrusion, the plan calls for two seasonal soil‑vapor sampling events before building occupancy to determine if a vapor intrusion mitigation system (membrane under foundations, venting) is needed; if so, indoor air sampling would continue at regular frequencies during the building’s life. He confirmed that data would be uploaded to GeoTracker and EnviroStor and that remediation instruments (LUCs, financial assurance, and environmental insurance) and agency sign‑offs are part of the process before future building permits would be issued.