Utilities, Utility Districts - As introduced, increases, from 15 to 20, the number of calendar days that may pass from the actual date specified in the first notice after a person responsible for excavation or demolition has given the notice of the intent to excavate or demolish before the person is required to serve additional notice if the excavation or demolition has not yet been completed; makes other changes to the Underground Utility Damage Prevention Act. - Amends TCA Title 65, Chapter 31, Part 1.