Maximum Vibration Level. Ground vibration from any High-Density Computing Facility shall not exceed the following Peak Particle Velocity (PPV), measured at any property line: 0.30 mm/s PPV during daytime hours (7:00 a.m. to 10:00 p.m.); 0.14 mm/s PPV during nighttime hours (10:00 p.m. to 7:00 a.m.).