Abstract: The present disclosure relates to a storage tank which includes a sloped internal plate(s) fabricated within a bottom portion of the tank to form an internal sloping floor. The storage tank may further include at least one optional sump and/or optional support saddle extending out from the tank body. The tank may include internal lining that covers at least a portion of the interior of the tank. A draw-off pipe may be included for removing water, sludge, or other undesirable elements collected at the base of the internal sloping floor.