Part 3 - Metro Gold Line Foothill Extension

Noise and Vibration Technical Report: Metro Gold Line Foothill Extension, Azusa to Montclair
July 2012
Page 111
LSTM Measurement Results
Figure 38: The FDL for Metrolink Trans
The vibration propagation tests were performed at seventeen locations throughout the proposed project
corridor. The locations of the tests and the measurement results, sorted by city, are presented in Section 2.
This section presents the best-fit and worst-case curves derived from those measurements and applied in
the prediction models.
Best-fit curves were fit to the data of each 1/3 octave band of the different measurement sites. The best-fit
curves were used to compare the results from all of the sites and develop worst-case curves that could be
applied throughout the corridor. After inspection of the results, the LSTM results were separated into
three groups: Glendora, San Dimas/La Verne, and Pomona/Claremont. The best fit results, presented by
city, are shown in Figure 39 through Figure 41 below.
A worst case curve was developed for each group by using the highest value in each 1/3 octave band for
that group. The worst case curves for each group are shown in Figure 42 below. The worst case curves are
used in the vibration prediction models to ensure that the vibration levels are not under predicted at the
sensitive receivers.