Patent ID: 8770889

Claim:
A method of preventing water from entering an interior area of a containment sump associated with an underground storage tank comprising the steps of: (a) accessing the interior area of the containment sump; (b) positioning a rigid form into the sump's interior area, said form extending from a base of the containment sump to at or near a top of the containment sump, whereby the interior area is divided into an outer annular open space and a reduced interior area; (c) introducing a settable mixture into the outer annular open space to substantially fill it; (d) sealing any piping to the form where the piping enters through the form; and (e) applying a polymeric material to an interior wall of the form to substantially cover the surface of the form's interior wall, whereby water is blocked from entering the reduced interior area of the containment sump by the settable mixture and by the polymeric material.