First Environment has been retained by Plymouth Rock Insurance Company (formerly High Point Insurance) over the last 10 years to conduct third party claims assessments and remedial investigations/actions at over 190 residential properties in northern New Jersey in response to leaking No. 2 underground fuel oil storage tanks. To meet our client’s objectives, we have overseen the installation and sampling of more than 1,000 soil borings and hundreds of monitoring wells to delineate the nature and extent of petroleum related contamination in both soil and groundwater in a variety of complex geologic frameworks including unconsolidated overburden and bedrock formations. Upon completion of the site and remedial investigation activities, we have either developed remedial specifications for independent contractors to bid upon or conducted the remedial actions ourselves.
Remedial actions for soil have ranged in complexity from relatively minor excavations to the design and installation of detailed support systems (helical pier, beams etc.) to structurally stabilize the residences while excavations fully extended under the residences. In many instances the removal of source area soil was sufficient to adequately address any dissolved phase constituents in groundwater. In those instances where excavation alone was not sufficient, we have developed alternative remedial strategies for groundwater including in-situ chemical oxidation or enhanced bio-augmentation.
Where sites have been impacted with free phase LNAPL we have implemented a variety alternatives ranging from the placement of absorbent material (socks or pads) to manual bailing to vacuum enhanced fluid recovery (VEFR). In several instances it was necessary to design and implement active product recovery through groundwater suppression.
Of the 190 cases assigned to First Environment, we have been able to successfully close out (through the issuance of No Further Action letter from NJDEP) all cases with the exception of eight that we are currently working on. In many instances, the remedial investigations and remedial actions had to be fast tracked (where appropriate and possible) due to a pending sale of the property.