S.D. Codified Laws § 49-7A-12
If any underground facility is damaged, dislocated, or disturbed in advance of or during excavation work, the excavator shall immediately notify the one-call notification center and, if known, the operator of the facility of the damage, dislocation, or disturbance. No excavator may conceal or attempt to conceal any damage, dislocation, or disturbance, nor may that excavator attempt to make any repair to the facility unless authorized by the operator of the facility. If the damage, dislocation, or disturbance results in the escape of any flammable, toxic, or corrosive gas or liquid, the excavator shall immediately report the escape to the authorities by calling the 911 emergency telephone number and notifying the one-call notification center and, if known, the operator of the facility.
SDCL 49-7A-12