Regulatory Agency: New Jersey Department of Environmental Protection (NJDEP)
New Jersey Licensed Site Remediation Professional
Contaminants: Chlorinated Solvents, Benzene
Remediation: In-situ Chemical Oxidation (ISCO) (soil and groundwater), Vapor Mitigation System (soil gas)
Treatment: Active Vapor Mitigation System and In-Situ Chemical Oxidation
Scope: Investigate, Remediate, and New Jersey Licensed Site Remediation Professional (LSRP) Services
- ESI conducted investigations for both a historic and more recent spill.
- Investigations identified contaminants in soil and groundwater requiring remediation and vapor requiring mitigiation.
- An active vapor mitigation system was installed to mitigate sub-slab soil gas.
- Soil and groundwater remediation consisted of ISCO.
Photo: Installation of an injection point in the location of the active dry cleaning operation.
A real estate transaction for a shopping center prompted an environmental investigation for the entire property. At the time of purchase, an environmental investigation was already being conducted for a historic release of gasoline related compounds and tetrachloroethene (PCE) from a former service station and former dry cleaner, respectively, both located in the same portion of the property.
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The prospective purchaser conducted a limited soil and groundwater investigation at the active dry cleaning business, located on in a different portion of the property.
This new investigation identified an additional release of PCE in both the soil and groundwater. As a condition of the property transaction, the prospective purchaser, ESI’s client, retained the responsibility of both investigations.
ESI provided LSRP services, as well as traditional environmental services, to complete the delineation of soil and groundwater impacts associated with the historic and recent releases. The groundwater investigation for the active dry cleaner triggered the requirements of a vapor intrusion (VI) investigation.
Based on the analytical results of the VI investigation, sub-slab soil gas and indoor air sampling, an active vapor mitigation system was designed, installed, and operated to mitigate the sub-slab soil gas beneath the retail spaces adjacent to the dry cleaner. ESI maintains, and annually reports to the NJDEP on the operations and maintenance of, the vapor mitigation system.
ESI prepared a Remedial Action Workplan and the NJDEP Discharge to Ground Water Permit by Rule Authorization Request that addressed the soil and groundwater impacts via an ISCO program. A Permit by Rule was issued by the NJDEP. Currently, the Site is in the post-remedial monitoring phase. It is anticipated in the near future the ESI LSRP will be able to issue a Response Action Outcome for the case following the issuance of a NJDEP-issued Groundwater Remedial Action Permit for Monitored Natural Attenuation.