67 Pa. Code § 157.52
(b) Diagrams. Plan view diagrams of nonstandard test sites are shown in Figures 2 and 3 of Appendix A of this chapter. Figure 2 illustrates a test site which is larger than a standard test site and is based upon a 60 foot (18.3 meters) distance between the microphone location point and the microphone target point. Figure 3 illustrates a test site which is smaller than a standard test site and is based upon a 35 foot (10.7 meters) distance between the microphone location point and the microphone target point.

