Columbia Gas of Ohio and Toledo-based Marco’s Pizza are joining together to remind property owners to call 811 to have underground utility lines marked before they dig. The service is free.

As part of this promotion, Marco’s will offer a large 1-topping pizza for $8.11 every Monday in April.

Columbia Gas wants property owners who are putting up a fence or planting trees or shrubs to call 811 at least 48 hours before excavation begins but not more than 10 days.

First Published April 8, 2014, 4:00 a.m.