The State of Texas Underground Facility Damage Prevention and Safety Act states that anyone that disturbs soil to a depth of 16 or more inches must contact a notification center before digging. Call DIG TESS at (800) 344-8377; operators are on duty 24-hours a day, seven days a week (excluding legal holidays).
You may call up to 14 business days before excavating, but no later than two business days before excavating. The operator will ask you where, when, and what type of excavation you are doing. A locator for the various utilities will mark their underground utilities at your site establishing safe clearances and ensure that your equipment avoids overhead electric lines/underground wires.