Southern is in the business of performing hydro-evacuation services, using hydro vacuum trucks to excavate around utilities (Tr. 83). The process involves using high-pressure water to create mud around underground utility lines which can then be vacuumed out by the truck (Tr. 83). Once excavated, the mud is transported on the truck to a dump site for off-loading (Tr. 83). Southern operates 13 vacuum trucks daily (Tr. 83). The company estimates it performs the dumping operation 4600 times per year (Tr. 100). Until the present accident, Southern had no injuries associated with its process.