Surface drill rigs 1993 6,825 h United States, Oakland, California
Surface drill rigs 2016 222 h United States, Norwalk, California
Surface drill rigs 2014 3,231 h United States, Norwalk, California
Surface drill rigs 1999 9,000 h United States, Santa Rosa, California
Surface drill rigs 2013 7,832 h United States, Goleta, California
Surface drill rigs 2012 United States, Fresno, California
Surface drill rigs 2016 2,000 h United States, Sacramento, California