ESI was contracted to remove an existing leaking underground storage tank (UST) system and install a new UST system for a residential apartment complex. ESI was responsible for all permitting, UST closure and NJDEP approvals.

After removal of the tanks, soil contaminated with fuel oil was encountered. All accessible contaminated soil was removed from the excavation and stockpiled on plastic pending characterization and disposal. After removal of all accessible contaminated soil, post-excavation soil samples were collected for analysis. After confirmation that remaining contaminant levels were less than all applicable New Jersey Department of Environmental Protection (NJDEP) soil cleanup criteria, ESI commenced with the installation of the new tank.

Prior to installing the new tank, a layer of washed gravel was placed on the bottom of the excavation and leveled. A double-walled (inner wall of steel and outer wall of fiberglass reinforced plastic [RFP]) 8,000-gallon tank was then placed into the excavation and backfilled with washed gravel. Double-walled, FRP supply and return piping was installed from the tank to the building. A piping sump was also installed to allow access to this piping. Single-walled FRP vent piping, spill and overfill protection, and steel electrical conduit (for monitoring system wiring) was installed. The excavation was then backfilled with washed gravel and was finished with a 6-inch concrete pad.

After tank installation, a two-point, liquid sensing monitoring system was installed. One probe was installed within the interstice of the underground storage tank and one probe was installed within the piping sump to detect any piping leaks. All probes were wired to the alarm consul, which was located in the basement.

After completion of tank replacement work, ESI characterized and disposed of the approximately 250 tons of fuel oil contaminated soil. After receipt of all disposal tickets and laboratory analytical data, ESI prepared a Remedial Action Report with a request for a No Further Action (NFA) determination, which was submitted to the NJDEP. An Unrestricted Use NFA determination was issued by the NJDEP.

Project goal was to upgrade an apartment village's fuel storage facility and bring it into compliance with New Jersey Department of Environmental Protection regulation