Vapor Intrusion at Former Electric Motor Repair Facility

Sovereign performs environmental consulting and remediation for an industrial client at a former electric motor repair facility in Linden, NJ in accordance with New Jersey's Industrial Site Recovery Act (ISRA). The scope of work includes Remedial Action Workplan (RAW) preparation, deed notice preparation, well inspection, redevelopment, and restoration, monitoring well installation, preparation of a permit-by-rule application to inject Hydrogen Release Compound (HRC), management and supervision of the HRC injection program, baseline and permit-by-rule groundwater monitoring, post-remediation soil sampling, natural attenuation monitoring, vapor intrusion investigation, vapor intrusion mitigation, progress reporting, and project management.

During 2009 and 2010, Sovereign conducted a vapor intrusion investigation of the facility consisting of sub-slab and indoor air sampling. The results of the on-site VI investigation indicated a completed vapor intrusion pathway. Sovereign also conducted a vapor intrusion investigation of nearby residences; no impact was detected. Sovereign designed, installed and operates a sub-slab depressurization system (SSDS) to mitigate vapor intrusion in the on-site structure. Sovereign also sealed cracks and pipe penetrations through the concrete floor to eliminate vapor migration pathways. Vacuum diagnostic testing conducted in November 2010 verified that the SSDS is inducing a vacuum in the sub-slab environment. Indoor air sampling is conducted periodically to verify that the SSDS is preventing vapor intrusion.