The CEO of the organization overseeing construction of the $16 billion Gateway Rail Tunnel under the Hudson River resigned last week. Kris Kolluri, who served as Gateway Development Commission CEO for two years, submitted his resignation letter on July 18 that’s effective Aug. 16. Here’s how his departure affect whats been called the nation’s largest infrastructure project. “Given the anticipated start of major tunnel construction this fall, it is the right time for me to step down and let the next leader oversee the construction phase of (Hudson River Tunnel Project),” Kolluri wrote to the bo…