(case involves challenge to EPA pesticide tolerance levels, and petition for review is granted in part and reversed in part and case remanded to EPA where: (1) Food Quality Protection Act requires EPA to set pesticide tolerance levels at ten times (10x) reduction absent reliable data that a higher tolerance will be safe for infants and children; (2) EPA data was reliable for avoiding the 10x reduction on four of seven challenged pesticide tolerances, but (3) EPA failed to explain its data for avoiding the 10x reduction for tolerances of three pesticides).