The net proceeds received from the sale of nine billion dollars ($9,000,000,000) principal amount of bonds authorized pursuant to this chapter, upon appropriation by the Legislature in the annual Budget Act, shall be available, and subject to those conditions and criteria that the Legislature may provide by statute, for (a) planning the high-speed train system and (b) capital costs set forth in subdivision (c) of Section 2704.04, consistent with the authority’s certified environmental impact reports of November 2005 and July 9, 2008, as subsequently modified pursuant to environmental studies conducted by the authority.