Ohio Man Buried Riding His Harley-Davidson Motorcyle

How much deeper did they have to dig the hole to bury him in that "coffin"?

If they used the standard "six feet under", and the bottom of the "coffin" was on the 6 foot mark, then the top would probably be less than 1 foot down from the top. So I wonder if they had to dig 10 feet down or so to accomodate the extra height for the "coffin". How accomodating was the cemetary to having to dig his grave deeper?