Table I.

TPD BN Model Nodes, States, Pre‐ and Postintervention Probabilities, and Node Types

Node	Node State	Preintervention Probability [%]	Postintervention Probability [%]	Node Type
$Z_1$: Third‐Party Excavator	Property Owner	19.41	19.41	$Z_C$
	Contractor	74.81	74.81
	Government Entity	5.78	5.78
$Z_2$: Potholing Performed?	Yes	22.07	100.00	$X$
	No	77.93	0.00
$Z_3$: Other Excavation Best Practices Performed?	Yes	71.60	71.60	$Z_C$
	No	28.40	28.40
$Z_4$: Sufficient Excavation Practices?	Yes	54.57	94.30	$Z_C,Z_M$
	No	45.43	5.70
$Z_5$: Sufficient L&M Practices?	Yes	87.66	87.66	$Z_S$
	No	12.34	12.34
$Z_6$: Sufficient Notification Practices?	Yes	54.54	53.02	$Z_C$
	No	45.46	46.98
$Z_7$: Sufficient Preventive Measures?	Yes	77.17	78.35	$Y$
	No	22.83	21.65