Starting in early June 2007, the drilling of the William 4-10 well reached 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 the Wilcox Sand, Mississippi Lime, Layton Sand, and Tonkawa Sand. The Wilcox Sand zone was completed in mid-August 2007. Production from the well began in mid-October 2007.