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<br />Proposals for Revising Northern California Metroplex – Alameda County/Contra Costa County 32 <br />Figure 17: Sample daytime TRUKN North and East SFO departures Pre NextGen (a.) compared to Post <br />NextGen (b).Pre NextGen traffic was vectored over the area, but does show legacy concentrations to the south (a). <br />Post NextGen traffic in the northern area was shifted eastward and concentrated over East Oakland and the <br />topographically higher East Bay Hills along the new GRTFL and DEDHD tracks. Gradation of color in flight <br />tracks from magenta to red to yellow and then blue represent generalized increases in aircraft altitude. Note: <br />comparing Figure a. to Figure b. indicates that aircraft altitude has decreased over OAK for Post NextGen <br />operations when compared to Pre NextGen operations. This apparent change to the procedure shifted the lower <br />portion of the climb profile from the Bay to communities in Alameda, East Oakland and San Leandro. <br /> <br />a. <br />b. <br /> <br />224