International Building Code Section 309

International Building Code 309.1

1 Mercantile Group M. Mercantile Group M occupancy
includes, among others, buildings and structures or a portion
thereof, for the display and sale of merchandise, and involves
stocks of goods, wares or merchandise incidental to such purposes
and accessible to the public. Mercantile occupancies
shall include, but not be limited to, the following:
Department stores
Drug stores
Motor fuel-dispensing facilities
Retail or wholesale stores
Sales rooms

International Building Code 309.2

Quantity of hazardous materials. The aggregate quantity
of nonflammable solid and nonflammable or
noncombustible liquid hazardous materials stored or displayed
in a single control area of a Group M occupancy shall not
exceed the quantities in Table 414.2.4(1).