Site Investigation and Remediation in Essex County, NJ

LSRP for Underground Storage Tank Remediation

Equity served as LSRP for the Newport Valero Underground Storage Tank (UST) Site in Essex County. Soil impacts, which were related to gasoline, were present in the unsaturated zone in the vicinity of the product piping and the downgradient end of the fuel tank dispenser island. Groundwater impacts included gasoline-related organic compounds and chlorinated solvent compounds. Former USTs at the Site included unleaded gasoline tanks and one heating oil tank. Upon his record review, the LSRP was able to determine that the heating oil UST was in fact a waste oil UST.

As it was a potential source of the chlorinated solvents detected in groundwater, soil and groundwater samples were collected in the vicinity of the waste oil UST. The samples were clean, except for lead, one other metal, and PAHs (polycyclic aromatic hydrocarbons). An investigation was conducted to determine if the chlorinated solvents were attributable to an upgradient, off-Site source. A PA (Preliminary Assessment) and SI (Site Investigation) were competed to identify any onsite sources of the chlorinated solvents. Although the PA found multiple potential source areas for the chlorinated solvents, no onsite source area was confirmed during the SI. The investigation included installation and sampling of temporary well points to augment the on-site monitoring well network. The distribution of chlorinated solvents consistently indicated an off-Site source. File reviews of Known Contaminated Sites in the vicinity indicated the presence of chlorinated solvents in groundwater. The NJDEP was notified of an offsite, upgradient source, the NJDEP issued a case number for the new offsite release, and the onsite case for chlorinated solvents in groundwater was closed via a Response Action Outcome (RAO).

The onsite lead impacts in soil were evaluated spatially, along with historical data generated at the Site. Based on both qualitative and quantitative/statistical assessments, the presence of lead impacts in soil was determined to be ubiquitous throughout the Site and not to be distributed in a pattern consistent with a release from a UST. It was unclear whether the lead would be addressed through a deed notice at the property or would be considered a separate case that would require remedial action by the property owner, who was not the Client.
Additional investigation indicated that some of the soil and groundwater impacts by gasoline-related constituents were attributable to historical releases (i.e., were the responsibility of the Client) while others were more recent (i.e., were the responsibility of the property owner). These distinct responsibilities were differentiated in the Remedial Investigation Report (RIR).

After some discussion and negotiation, the property owner notified the NJDEP of a new release and hired a separate LSRP to complete the remediation. A Remedial Action Workplan (RAW) was prepared, which proposed ISCO as the appropriate remedy for petroleum impacts being remediated by the Client. The RIR and RAW included updated Receptor Evaluations (REs), which in turn documented a vapor intrusion (VI) investigation, and CIDs. The proposed ISCO program was completed and post-excavation soil and groundwater sampling confirmed its effectiveness. The Deed Notice, RAR, Remedial Action Permit (RAP) for Soil, and RAO are pending.

Project Components

  • LSRP Services
  • Remedial Investigation
  • Groundwater Monitoring & Reporting
  • NJDEP
  • Remedial Investigation Report (RIR)
  • Remedial Action Workplan (RAW)
  • Deed Notice
  • Remedial Action Report (RAR)
  • Remedial Action Permit (RAP)
  • Response Action Outcome (RAO)

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