What area comprises the Washington Street shaft?

The Washington Street shaft is specifically associated with Tunnels E and F. This particular area is critical for the operational aspects of the infrastructure, as shafts are often utilized for access to tunnels for maintenance, inspections, and other operational needs. Tunnels E and F would therefore be the ones serviced or accessed through the Washington Street shaft, making this choice the most relevant and accurate in the context of the question. The correct identification of such infrastructure is essential for understanding the layout and connectivity of the system being studied, which is crucial in engineering and maintenance operations.