COVID-19 related supply chain issues are causing up to 3-5 week delays on all orders. We will continue to ship as soon as possible.

Common Ground Alliance,

Stacy Cummings, “Do You Know What’s Below? Call 811 Before You Dig!”, U.S. Department of Transportation “Fast Lane” blog, Aug. 6, 2015, bulletins/1132ec1

National Transportation Safety Board, pipeline accident brief,

Washington State Department of Labor & Industries,http://www.lni.wa. gov/safety/research/face/files/711362015laborerelectrocuted.pdf

Cynthia Quarterman, “An Easy Call to 811 Could Prevent a Call to 911,” U.S.Department of Transportation “Fsne” blog,

Common Ground Alliance, 2017 DIRT Report

U.S. Department of Transportation, Pipeline and Hazardous Materials Safety Administration, “Safe Digging Testimonial: A Call to 811 Could Prevent a Call to 911,”April 21, 2014,

OSHA “Trenching and Excavation” Web page, SLTC/trenchingexcavation/

OSHA, “Trenching and Excavation Safety” guide, 2015, https://www.

U.S. Bureau of Labor Statistics, “Nonfatal Occupational Injuries and Illnesses Requiring Days Away from Work, 2014,”