The drilling of the William 4-10 well began in early June 2007, reaching a depth of 4,810 feet in mid-June 2007. The well's electric and radiation logs indicated that it contained four potential commercial pay zones, namely Wilcox Sand, Mississippi Lime, Layton Sand, and Tonkawa Sand. The Wilcox Sand zone was completed in mid-August 2007. Production began in mid-October 2007.