UST Investigation And Remediation Residential Property, Randolph, New Jersey

Regulatory Agency: New Jersey Department of Environmental Protection
Contaminants: Petroleum Hydrocarbons
Remediation: Excavation
Treatment: Offsite Disposal
Scope: Investigate, Design, and Remediate

Project Summary
  • The extent of the impacted soil extended beneath a portion of the residential structure and standing deck.
  • Soil remediation consisted of excavation and off-site disposal. Prior to excavation activities, a protective structural support system was installed.
  • Through field documentation, revealed neither a groundwater investigation or remedial action was required.
  • NJDEP issued an Unrestricted Use – No Further Action & Covenant Not to Sue Letter.
UST Investigation And Remediation Residential Property, Randolph, New Jersey
Photo: A structural support system including helical pilings was installed to prevent structural damage during excavation activities.
Project Details

A release was reported to the New Jersey Department of Environmental Protection (NJDEP) following the removal of a 550-gallon No. 2 Fuel Oil underground storage tank (UST).

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The UST was located adjacent to the residential structure’s foundation. ESI, through a soil investigation determined the extent of the impacted soil which extended beneath a corner of the residential structure and the standing deck.

A protective structural support system was designed and installed to support the residential structure adjacent to, and the standing deck above, the excavation area. Building permits from the Township were obtained.

Based on the results of the investigation, approximately 140 tons of impacted soil was excavated and disposed of at a licensed facility.

During excavation activities it was documented that groundwater was not present and/or in contact with the impacted soil; therefore, a groundwater investigation was not warranted.

Site restoration efforts included re-paving and/or sealing the driveway, backyard leveled as requested by the client and re-seeding. An AOC, Unrestricted Use – No Further Action & Covenant Not to Sue letter was issued by the NJDEP.