Reliable Bus Lines Underground Tank Replacement

Reliable Bus Lines Underground Tank Replacement

CommTank provided an underground storage tank removal service of two 5,000·gallon tanks and the installation of one 5,000·galion aboveground storage tank with a concrete pad at the Reliable Bus Lines headquarters in New Bedford, Massachusetts. The following sections summarize the work required to replace the underground tanks with a new aboveground tank and connect it to the existing fuel dispenser. This aboveground storage tank is manufactured by Hall Tank with a double-wall steel design and interstitial monitoring. Double-wall steel tanks from Hall Tank meet UL 142 and EPA SPCC requirements.

Steps to Remove an Underground Fuel Storage Tank

  • Obtain necessary permits from the New Bedford Fire Department
  • Obtain trench permit
  • Provide Dig Safe utility clearance of the property (identify underground utilities)
  • Install a chain link fence to secure the work area
  • Drain and disconnect the pipes to the two (2) fuel dispensers
  • Remove the existing gasoline dispenser
  • Break concrete and asphalt located on top of the USTs
  • Excavate soil located on top of the USTs
  • Create a manway into the USTs
  • Remove all pumpable contents and tank bottoms
  • Measure explosive gases using a 4-gas meter
  • Enter and clean the underground diesel tank partition
  • Inert the gasoline partition of the UST using carbon dioxide
  • Remove and prepare the underground tank for fire department inspection
  • Transport and dispose of the USTs and associated piping at a licensed tank yard
  • Field screen soil using an organic vapor meter (OVM)
  • Send two (2) soil samples one from each tank grave to a state-certified laboratory for extractable petroleum hydrocarbon/volatile petroleum hydrocarbon (EPHNPH) analysis
  • Fill excavation to grade with clean fill (sand and stone)
  • Submit a FP-290R form to the Massachusetts Department of Environmental Protection (MADEP) and the local fire department
  • Provide a UST closure report

Compacting soil after removing petroleum contamination

Steps to Install a Concrete Pad with Bollards

  • Obtain a permit from the New Bedford building department
  • Saw cut the existing asphalt and excavate 18" in the foot print for the new concrete pad
  • Install and compact 12" base of  ¾” crush stone base for the new concrete pad
  • Install one (1) 12" thick steel reinforced concrete pad. The pad should be 9' wide by 21' long with 2 layers of # 5 rebar 12" o.c.
  • Install nine (9) 6" diameter steel traffic bollards with yellow plastic covering to protect the tank from vehicle traffic. Each bollard should be installed 4' above ground and 3' below ground with 2' wide concrete foundations.

Aboveground tank pad with steel bollards

Steps to Install an Aboveground Fuel Storage Tank

  • Submit the installation plans to the New Bedford Fire Department and obtain necessary permits
  • Provide and install one 5,000-galion ConVault dual wall aboveground tank
  • Provide and install one (1) clock gauge
  • Provide and install one (1) fill limiter/overfill prevention valve
  • Install the previously removed Veeder Root™ level probe and leak detection sensor
  • Provide and install two (2) fire safety valves
  • Provide and install one (1) 12' high vent pipes with overfill vent alarms and caps
  • Provide and install one (1) fill ports with a 15-gallon overfill containment
  • Provide and install a fuel pipe from the new AST to the existing dispenser equipped with ball valves, fire safety and solenoid valves

Upon completion CommTank transferred all salvageable fuel (all but the last ¼) from the underground storage tanks that were removed into the new aboveground storage tank and tested the new tank system for proper operation.

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