retail uses. Based on the site chosen, the Chargers would have largely relied on mass transit to take fans to and from the stadium on game days since it is unlikely that any of the proposed sites would have provided enough land for a stadium, real estate development and surface-level parking lots. A proposed golf course site in Oceanside, for example, was approximately 71 acres (see below), less than half the size of the Qualcomm site () that was initially proposed by the Chargers. Plus the necessary widening of I-5 will not begin until at least 2020 according to Caltrans. Proposed Stadium Sites National City The proposed National City site was west of Interstate 5 and south of Bay Marina Drive, located east of the 24th Street Marine Terminal. The Port of San Diego studied the dimensions of the site and come to the conclusion that a stadium could be built on the site without disturbing the Port's mission to promote maritime jobs and commerce. Any potential development proposal would have required the Port's approval. Planning discussions were discussed among the Port, National City and waterfront businesses to reconfigure the layout of the site to make it more efficient with or without a stadium. National City officials believed the benefit of a new stadium would spur new developments around it, generating tax dollars while also boosting the city's profile. On May 12, 2007, National City dropped its new stadium proposal, citing problems with land ownership. Downtown San Diego There were three notable proposals for Downtown San Diego. The first and most notable was the plan by Doug Manchester to replace the 10th Avenue Marine Terminal with a stadium complex. An alternative to the 10th Avenue site was to place the stadium on the waterfront behind the San Diego Convention Center. Finally the East Village was recently proposed by the Chargers due to less legal concerns from local Environmental Activists. 10th Avenue Marine Terminal replacement This proposal was by far the most ambitious. Local philanthropist and real estate developer Doug Manchester proposed building the new stadium on the site of the 10th Avenue Marine Terminal. This was opposed by Port Commissioners at the Port of San Diego and the idea never publicly passed the preliminary design phase. Waterfront Convadium One proposed plan, known as the Phase 4 Expansion, would have put the stadium on the waterfront behind the San Diego Convention