When measuring total sound or residual sound within
a multi-use property, or within a residential unit when the property
line between it and the source property is a common wall, all exterior
doors and windows shall be closed and the measurements shall be taken
in the center of the room most affected by the noise. Residual sound
shall be measured in accordance with N.J.A.C. 7:29-2.9(b)2. When measuring
total sound or residual sound, all sound sources within the dwelling
unit must be shut off (e.g., television, stereo). Measurements shall
not be taken in areas which receive only casual use such as hallways,
closets and bathrooms.