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Lead and Its Effect Upon Range Users.  A clean, hazard-free, air
environment is an essential design requirement for an indoor shooting range.
had is a toxicant which will cause lead poisoning in humans exposed to
excessive amounts over a period of time.  The Occupational Safety and Health
Administration (OSHA) has established limits of exposure to lead dust at 50
micrograms/cu m/hr average for an 8-hour day (total daily exposure may not
exceed 400 micrograms).  For trainees and others who are exposed less than 240
hours per year, this total daily dosage may be absorbed at a rate of up to 200
micrograms/cu m/hr without the benefit of respiratory protection.
Administrative controls should require the we of respiratory protection for
full-time range personnel or limit their daily exposure to the hazard to not
more than an B-hour Time Weighted Average (TWA) of 50 micrograms/cu m/hr.
However, because range operation is intermittent, exposure to lead dust by
shooters, instructors, and maintenance personnel is somewhat less than a full-
time eight-hour day.  Although design criteria could be based upon such
anticipated range usage, the initial design goal for lead dust exposure is 3O-
40 micrograms/cu m/hr TWA with an acceptable limit of 50 micrograms/cu m/hr
TWA. Refer to Occupational Safety and Health Administration (OSHA), Department
of Labor Handbook, CFR Title 29-1910.1025c.(1) and (2) and e. (1) (ii). If
subsequent testing establishes that this design limit is not achievable, an
adjustment of operating hours or individual exposures as shown in Table 2
should be considered.  Design criteria should be based upon anticipated range
usage end local operating procedures.
Physical Features.
Indoor ranges shall be housed in a building
furnished with heating, lighting, ventilating, air conditioning (if required
by criteria for comfort control in the locale) and water, sewer. and electric
services.  Fire protection features shall be in accordance with MIL-HDBK-
1008, Fire Protection for Facilities Engineering, Design and Construction.
Portable water dispensers, portable toilets, or use of existing facilities
will be acceptable when defined as a requirement during project planning
stage.  Refer to DM-3.03, Heating Ventilating, Air Conditioning and
Dehumidifying Systems, for criteria pertaining to air conditioning.
building material surfaces will be selected to facilitate housekeeping
procedures for the removal of lead dust.  As an example, a range floor should
not be swept, but should be vacuumed with a vacuum cleaner designed for safe.
collection of range materials, washed down, or damp mopped.  Building ledges
must be minimized to reduce surfaces where lead dust will collect.  The floor
shall slope to floor drains located approximately 20 ft (6.1 m) downrange from
the firing line for range washdown purposes. Floor drain8 are desirable, but
not required for existing structures or for new structures not identified
during planning to have piped water.  Floor drains shall be designed to
minimize the possibility of ricochet.  Drains must connect to the
treatment/filtration system or to a "sediment trap" so as not to pollute lakes
or rivers.
Construction Materials

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