The project scope was to excavate, clean, remove and properly dispose of one 5,000-gallon and one 6,000-gallon underground No. 2 and No. 4 fuel oil underground storage tanks and to install a new 8,000-gallon, underground No. 2 fuel oil storage tank system complete with secondary containment, corrosion protection, spill/overfill protection and leak detection. 

The existing tanks were uncovered, cut open and cleaned. A Health and Safety Plan was implemented and all OSHA confined space regulations were followed. After cleaning, both tanks were removed from the ground and disposed of at a scrap metal recycling facility.

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 NJDEP soil cleanup criteria, ESI commenced with the installation of the new tank.

Prior to installing the new tank, a layer of 3/8-inch 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 3/8-inch 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 3/8-inch 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 console, 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 and submitted the Remedial Investigation Report to the NJDEP.