Aspen prepared an IS/MND for SCE's Permit to Construct the Viejo System Project. This project included construction of a 220/66/12 kilovolt (kV) substation (Viejo Substation) and a 3.1-mile 66 kV subtransmission line between the proposed Viejo Substation and the existing Chiquita Substation. The project would also include the replacement of 19 dual-circuit tubular steel poles with 13 H-frame structures capable of carrying four 66 kV circuits, and the installation of two optical ground wires. The Final IS/MND was released in May 2004.