Table 6.19 – Side Reach
Current Guidelines:  
4.1.3  Accessible Buildings: New Construction.  Accessible buildings and facilities shall meet the following minimum requirements: . . . 

(13)  Controls and operating mechanisms in accessible spaces, along accessible routes, or as parts of accessible elements . . . shall comply with 4.27.

4.27.3  Height.  The highest operable part of controls, dispensers, receptacles, and other operable equipment shall be placed within at least one of the reach ranges specified in 4.2.5 or 4.2.6. . . .

4.2.6  Side Reach.  If the clear floor space allows a parallel approach by a person in a wheelchair, the maximum high side reach allowed shall be 54 in (1370 mm) and the low side reach shall be no less than 9 in (230 mm) above the floor (Fig. 6 (a) and (b)).  
[Note:  Figures 6 (a) and (b) show a reach depth of 10 inches maximum.]  

Final Revised Guidelines:  
205.1  General.  Operable parts on accessible elements, accessible routes, and in accessible rooms and spaces shall comply with 309.  

228.1  General.  Where provided, at least one of each type of depository, vending machine, change machine, and fuel dispenser shall comply with 309.  
Exception:  Drive-up only depositories shall not be required to comply with 309.  

228.2 Mail Boxes.  Where mailboxes are provided in an interior location, at least 5 percent, but no fewer than one, of each type shall comply with 309.  In residential facilities, where mailboxes are provided for each residential unit, mail boxes complying with 309 shall be provided for each residential dwelling unit required to provide mobility features complying with 809.2 through 809.4.  

309.3  Height.  Operable parts shall be placed within one or more of the reach ranges specified in 308.

308.3  Side Reach.

308.3.1 Unobstructed.  Where a clear floor or ground space allows a parallel approach to an element and the side reach is unobstructed, the high side reach shall be 48 inches (1220 mm) maximum and the low side reach shall be 15 inches (380 mm) minimum above the finish floor or ground.
Exceptions: . . .  
2:  Operable parts of fuel dispensers shall be permitted to be 54 inches (1370 mm) maximum measured from the surface of the vehicular way where fuel dispensers are installed on existing curbs.  

308.3.2  Obstructed High Reach.  Where a clear floor or ground space allows a parallel approach to an element and the high side reach is over an obstruction, the height of the obstruction shall be 34 inches (865 mm) maximum and the depth of the obstruction shall be 24 inches (610 mm) maximum.  The high side reach shall be 48 inches (1220 mm) maximum for a reach depth of 10 inches (255 mm) maximum. . . .

Model Codes & Standards
ICC/ANSI A117.1-1998:  Sections 308.3.1 and 308.3.2 have equivalent requirements for a side reach.