We have discussed this before
Foodservice back-of-house areas, fall under the gray area of the code. The back-of-house areas are subject to interpretation
Trying to enforce accessibility in the typical, commercial kitchen facility, is not practical
Analysis and Commentary on the 2010 ADA Standards for Accessible Design
Several exceptions to section 206.2.8 of the 2010 Standards exempt common use circulation paths in employee work areas from the requirements of section 402 where it may be difficult to comply with the technical requirements for accessible routes due to the size or function of the area:
Common use circulation paths within employee work areas that are less than 1,000 square feet and are defined by permanently installed partitions, counters, casework, or furnishings are exempt. Kitchens in quick service restaurants, cocktail bars, and the employee side of service counters are frequently covered by this exception.