slope to sump with closeable drain (see para. 3.4.8) located not more than 6
feet (1829 mm) from outer margin of washstand as illustrated in Facility Plate
Sheets 1, 4, 6, and 11. Slope exterior ramps downward from exterior flat
(flushed) door sills as illustrated in Facility Plate Sheet 9. The sloped
floor or curb are essential to contain spills and facilitate cleanup
operations. The intent is to provide secondary containment for at least 110
percent of the capacity of the largest bulk liquid pesticide container
anticipated for the facility.
Operational Note. Liquid pesticide storage quantities range from 25 to
500 gallons (94.63 to 1892.55 L) but the largest container is rarely
larger than 55 gallons (208 L). Since rupture of more than one
container is unlikely, allow for 60 gallons (225.1 L) in small shop and
125 gallons (471.12 L) in all others. Most storage and mixing rooms
with 4-inch (102-mm) curbs or sloped floor (3/100) will easily contain
the required volume.
See Facility Plates Sheets 1 through 8 for suggested layouts and details. The
thickness of the slab shall be designed to accept live loads equal to the
weight of a 55 gallon (208 L) drum (500 lb (227 kg)) in the interior storage
area. For other areas existing standards suffice. The installation of
utility, heating or ventilation ducting is prohibited in or below slabs.
Concrete floors shall be finished with a nonabsorbent nonskid finish. Refer
to NAVFAC NFGS-03300, Cast-in-Place Concrete, for detailed criteria. The
floors in both the storage and mixing areas shall be covered with nonskid
epoxy sealant or otherwise made impermeable to absorption. Pesticide
concentrates and finished (formulated) materials shall be prevented from
entering the sanitary or storm sewer systems. The change room and office
floors may be tiled.
Exterior Walls. Exterior walls shall be constructed of either
metal, concrete, or masonry materials. Porous surface finishes shall not be
used in pesticide areas. Interior surface of exterior walls and partitions
shall be constructed of either metal, or coated concrete or masonry materials.
Doors and Windows.
220.127.116.11.1 Doors. Exterior doors shall be self-locking and self-closing with
weather stripping. Provide doors with locks to prevent unauthorized entry.
Provide flat (flush) sill to all doors between the mixing and storage areas.
18.104.22.168.2 Overhead Garage Door. Provide a 9 foot (2.74 m) high by 9 foot
(2.74 m) wide door with weather stripping. Higher doors may be required to
accommodate high mast equipment. Provide a flat (flushed) sill for the garage
doorway if the garage is separate from the pesticide mixing and storage areas.
If not, provide a ramp to a 4-inch (104-mm) high sill. Provide slope away
from exterior of door to prevent rain water from entering facility.