On 90 feet diamond, 4 feet by 6 feet, 6 inches from plate, even with center of plate 8 and 1/2 inches from front or back. Catcher's box is 43 inches wide and 6 feet from back of batter's box. See diagram 2 in FED rule book.
http://www.ncaa.org/library/rules/20...ball_rules.pdf, page 17 show slightly different dimensions.
Good luck.