List of Figures

1. left: View from the PTV operations room. right: View from the PTV pit.
2. This figure presents the quantity of potential energy stored in the compressed water as a function of pressure and the volume of water in the vessel. The volume of the vessel is $V$ but solid aluminum ingots can be used to reduce this volume to $\frac{3}{4} V$, $\frac{1}{2} V$, or $\frac{1}{4} V$. The right ordinate axis expresses the potential energy in conventional terms while the left ordinate axis expresses the energy in terms of the hypothetical vertical distance that the 3650 lbs cap could be propelled. The quiet protocol applies to pressures less than 3500 psi, the notify protocol applies in the yellow-shaded region, and the evacuate protocol applies elsewhere.
3. Schematic used for calculation of the potential energy stored in the compressed water.
4. Schematic of the ground floor of OSB. The $\Omega$-symbol indicates the proposed locations of the notification signs.