By Andrew Gould Several new umpires will enforce MLB’s rule changes next season. According to ESPN’s Jesse Rogers, 10 umpires are retiring at the end of the month. That creates the job’s most turnover since 1999. The umpires stepping down include seven crew chiefs: Ted Barrett, Greg Gibson, Tom Hallion, Sam Holbrook, Jerry Meals, Jim Reynolds and Bill Welke. Marty Foster, Paul Nauert, and Tim Timmons are also retiring. The retiring umpires have worked over 200 combined seasons and called 16 World Series. Barrett, the home-plate umpire for David Cone’s perfect game in 1999, worked five Fall Cla…