A precast, prestressed concrete tank, comprising: a primary tank including an inner wall; and a secondary tank including an outer wall having a plurality of first precast outer wall panels and at least one second precast outer wall panel, the primary tank disposed inside of the secondary tank, and the secondary tank having a temporary construction opening frame disposed on a base for delivery of components of the primary tank through the temporary construction opening frame, the temporary construction opening frame having a base section, a pair of column sections, and a header beam section, the temporary construction opening frame defining a temporary construction opening which is sealable by installation of a plate assembly that is further spaced apart from the inner wall of the primary tank, wherein the at least one second precast outer wall panel is disposed on top of the header beam section of the temporary construction opening frame, wherein the secondary tank has at least two phases of wire windings, the two phases of wire windings including a first phase of wire windings and a second phase of wire windings, the first phase of wire windings having a first portion and a second portion, the first portion attached by clamps to each of the pair of column sections and wound around only part of a perimeter of the secondary tank, and the second portion disposed above the pair of column sections and wound around an entirety of the perimeter of the secondary tank, and the second phase of wire windings wound around the entirety of the perimeter of the secondary tank over at least the first portion of the first phase of wire windings and disposed over a top of the plate assembly once installed to seal the temporary construction opening, wherein the clamps are used to affix free ends of the first phase of the wire windings, and to securely hold said wire windings under tension even when sections of said wire windings over the temporary construction opening have been cut and removed during assembly, wherein the temporary construction opening frame is disposed adjacent at least one of the first precast outer wall panels, and wherein the at least one second precast outer wall panel has a height that is less than a height of each of the first precast outer wall panels. a primary tank including an inner wall; and a secondary tank including an outer wall having a plurality of first precast outer wall panels and at least one second precast outer wall panel, the primary tank disposed inside of the secondary tank, and the secondary tank having a temporary construction opening frame disposed on a base for delivery of components of the primary tank through the temporary construction opening frame, the temporary construction opening frame having a base section, a pair of column sections, and a header beam section, the temporary construction opening frame defining a temporary construction opening which is sealable by installation of a plate assembly that is further spaced apart from the inner wall of the primary tank, wherein the at least one second precast outer wall panel is disposed on top of the header beam section of the temporary construction opening frame, wherein the secondary tank has at least two phases of wire windings, the two phases of wire windings including a first phase of wire windings and a second phase of wire windings, the first phase of wire windings having a first portion and a second portion, the first portion attached by clamps to each of the pair of column sections and wound around only part of a perimeter of the secondary tank, and the second portion disposed above the pair of column sections and wound around an entirety of the perimeter of the secondary tank, and the second phase of wire windings wound around the entirety of the perimeter of the secondary tank over at least the first portion of the first phase of wire windings and disposed over a top of the plate assembly once installed to seal the temporary construction opening, wherein the clamps are used to affix free ends of the first phase of the wire windings, and to securely hold said wire windings under tension even when sections of said wire windings over the temporary construction opening have been cut and removed during assembly, wherein the temporary construction opening frame is disposed adjacent at least one of the first precast outer wall panels, and wherein the at least one second precast outer wall panel has a height that is less than a height of each of the first precast outer wall panels.