Final answer:
The variable that is not considered in the timber shoring tables found in appendix C is Ambient Temperature.
Step-by-step explanation:
The variable that is not considered in the timber shoring tables found in appendix C is Ambient Temperature. The timber shoring tables are used to determine the safe capacity of timber shoring systems for supporting trenches during excavation and construction. These tables typically consider factors such as soil type, depth of trench, and slope of trench sides, but ambient temperature is not taken into account.