The Department of Toxic Substances Control (DTSC) approved the Remedial Action Plan (RAP) for the Rancho Cordova Logistics Center Buildings 1 and 2, Area 49000 (Project Site). The RAP summarized previous environmental investigations and concluded that the remediation of Volatile Organic Compounds (VOCs) including
trichloroethene (TCE), chloroform, 1,3 butadiene, benzene, and ethylbenzene in soil vapor is required for the planned commercial/industrial warehouses development (Warehouse Development). The Warehouse Development Project includes five (5) warehouses and four (4) stormwater detention basins. The RAP was prepared for Buildings 1 and 2, which are the only buildings currently planned for construction. Buildings 3, 4, and 5 are planned for possible construction at a later date and therefore, not included in the approved RAP.
Project activities consist of installing a Vapor Mitigation System (VMS) underneath the planned Warehouse Buildings 1 and 2. This remedy involves incorporating passive VMS with an active contingency into the engineering designs for the buildings to address the potential intrusion into indoor air of VOC vapors from beneath the building slabs. The VMS would collect VOC vapors and vent them to ambient air above the building roof. This remedy is consistent with the existing Land Use Covenant (LUC) for the Site which requires vapor mitigation on any new buildings constructed that are intended for occupancy. The VMS is fundamentally incorporated into the physical design of the Warehouse Buildings and will be installed as part of the construction process for Building 1 and Building 2. Institutional Controls in the form of the existing
LUC and an Operation & Maintenance (O&M) agreement will oversee the proper implementation and long-term O&M and monitoring of this remedy.