Abstract: The apparatus to practice the method of this invention is particularly effective in repairing underground gasoline storage tanks which have fractures or perforations directly underneath the filler pipe. A boring and injection tool projects down the filler pipe and perforates and seals adjacent the bottom of the storage tank. A soil stabilizer is injected into the area adjacent and exterior of the underground storage tank. The chemicals project into the pea gravel surrounding the tank and polymerize or solidify to stop infiltration or exfiltration. A sanding tool is next utilized to remove the glaze from the interior of the fiber glass tank. Water is evacuated from the tank and an air jet cleaning tool is utilized to remove the film of water from the area to be repaired. Next, an epoxy injection tool is utilized to deposit epoxy over the area to be repaired. Epoxy solidifies to the inner wall of the tank repairing the perforated or fractured area.

Abstract: The apparatus to practice the method of this invention is particularly effective in repairing underground gasoline storage tanks which have fractures or perforations directly underneath the filler pipe. A boring and injection tool projects down the filler pipe and perforates and seals adjacent the bottom of the storage tank. A soil stabilizer is injected into the area adjacent and exterior of the underground storage tank. The chemicals project into the pea gravel surrounding the tank and polymerize or solidify to stop infiltration or exfiltration. A sanding tool is next utilized to remove the glaze from the interior of the fiber glass tank. Water is evacuated from the tank and an air jet cleaning tool is utilized to remove the film of water from the area to be repaired. Next, an epoxy injection tool is utilized to deposit epoxy over the area to be repaired. Epoxy solidifies to the inner wall of the tank repairing the perforated or fractured area.

Abstract: An elongated skid mounted measuring device for utilization in conjunction with a closed circuit TV camera for accurately determining variations in the internal diameter of a conduit. The device comprises a spring loaded deflection arm to which is secured a ruler movably positioned adjacent a reference marker to visually indicate relative movement of the deflecting arm in slidable contact with the interior of a conduit. The device is designed primarily for utilization in conjunction with a closed circuit TV camera. The device is suitable for utilization with any camera means for recording the degree of movement of the deflection arm.

Abstract: A method and apparatus for accurately determining the depth and extent of erosion in underground gasoline storage tanks at service stations. The apparatus provides for cleaning the interior of the tank adjacent the filler pipe, casting a duplicate of the eroded area by means of a casting cup and injector depositing molding materials, and removing the negative of the eroded area. The equipment comprises a brush and extension handle, a casting cup has a cylindrical body with a rectangular opening in the wall for removing solidified casting. The injector includes an operating rod, a cylinder, a piston, and a dispensing valve. The dispenser may be used for injecting a variety of fluids into the eroded area for dispersing inhibitors, injecting molding materials, and in the repair steps after the tank has been emptied and the eroded area cleaned.