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A method is provided for preventing water from entering a containment sump of an underground storage tank. After accessing an interior of the sump and interrupting the flow paths of piping, a form is positioned in the sump. An annular open space formed between the sump's sidewall and the form is sub

A method is provided for preventing water from entering a containment sump of an underground storage tank. After accessing an interior of the sump and interrupting the flow paths of piping, a form is positioned in the sump. An annular open space formed between the sump's sidewall and the form is substantially filled with a settable material. An inside wall of the form next has applied to it a polymeric material to seal off an source of water seepage. The piping flow paths are reestablished to create a waterproof containment sump.

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1. 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 bas

1. 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. 2. The method of claim 1 wherein the settable mixture is concrete. 3. The method of claim 1 wherein the settable mixture is an expandable polymeric foam material. 4. The method of claim 1 wherein the settable mixture is an expandable open cell polyurethane foam material. 5. The method of claim 1 wherein the rigid form is cylindrical-shaped. 6. The method of claim 1 wherein the form includes holes for piping to extend through. 7. The method of claim 1 wherein prior to positioning the rigid form into the sump's interior access holes are drilled through the sump's sidewall and a ground penetrating flowable sealant is introduced until said sealant substantially fully covers the sump's outer walls. 8. The method of claim 1 further comprising the step of installing a light admitting lid onto the containment sump. 9. The method of claim 1 further comprising the step of installing a lid with a viewing window onto the containment sump. 10. The method of claim 9 wherein the viewing window of the lid has an area of at least about 100 square inches. 11. The method of claim 1 wherein the polymeric material is applied to the interior wall of the form to result in an at least about 20 mils layer. 12. 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) interrupting the flow path of any piping which extends through the containment sump's sidewalls into the interior area of the containment sump;(c) positioning a rigid generally cylindrical-shaped 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;(d) introducing a settable mixture into the outer annular open space to substantially fill it;(e) reestablishing the flow path of the piping within the containment sump's inner open space;(f) sealing any piping to the form where the piping enters through the form;(g) applying a polymeric material to an interior wall of the form to substantially cover the surface of the form's interior wall; and(h) installing a light admitting lid onto the containment sump, whereby water is blocked from entering the reduced interior area of the containment sump by the settable mixture and by the polymeric material. 13. The method of claim 12 wherein the settable mixture is an expandable polymeric foam material. 14. The method of claim 12 wherein the lid is made of a clear or translucent polymeric material.