Patent ID: 8297466

Claim:
A sewage tank for use with a pump to convey sewage, said sewage tank comprising: a container having an upper portion and a lower tapering portion defining a chamber, and having a longitudinal axis, said lower tapering portion comprising a lowermost portion defining a bottom of said container, and said lower tapering portion having a reduced size compared to said upper portion; an outwardly-extending member comprising a plurality of separate outwardly-extending member portions releasably attachable around said lower tapering portion of said container and disposable generally normal to said longitudinal axis, said plurality of separate outwardly-extending member portions being attachable below a bottom of the upper portion, and being attachable generally adjacent to said bottom of said container so that an elevational distance from said plurality of separate outwardly-extending member portions to said bottom of said upper portion is greater than an elevational distance from said plurality of separate outwardly-extending member portions to said bottom of said container; and said lower tapering portion of said container and said outwardly-extending member being configured to allow backfilling of material in an area between an upper surface of said outwardly-extending member and an outside surface of said lower tapering portion of said sewage tank so that the backfill provides sufficient ballast under high ground water conditions.