Potable water treatment plants and potable water piping from Tech. rooms to PCA pits. Blue water treatment plants and blue water piping from Tech. rooms to vacuum pits. Vacuum receiver plants and piping from blue water pits to plant rooms to sewer drainage lines. PCA air handling units installed in node building. PCA air ducting from node buildings to PCA pits Glycol water piping from node buildings to Tech. room Glycol chillers systems in Tech. rooms PCA/Potable water pits Vacuum/Blue water pits 400Hz pits/GPU 400 Hz units installed in node buildings/GPU coilers installed under the PBB