Calculation of threshold planning quantities (TPQs) for solids and mixtures

DOE-HDBK-1139/3-2005

Sources11

Consolidated Requirements12

40CFR355.30(e)

4.4.3 Calculation of threshold planning quantities (TPQs) for

solids and mixtures

4.4.3.1 If a container or storage vessel holds a mixture or

40CFR355.30(e)(1)

solution of an extremely hazardous substance, then

the concentration of extremely hazardous substance,

in weight percent (greater than 1 percent), shall be

multiplied by the mass (in pounds) in the vessel to

determine the actual quantity of extremely hazardous

substance therein.

4.4.3.2 Extremely hazardous substances that are solids are

40CFR355.30(e)(2)

subject to either of two threshold planning quantities

as shown in appendices A and B of 40CFR355 (i.e.,

500 or 10,000 pounds). The lower quantity applies

only if the solid exists in powdered form and has a

particle size less than 100 microns49; or is handled in

solution50 or in molten form51; or meets the criteria

for an NFPA rating of 2, 3 or 4 for reactivity. If the

solid does not meet any of these criteria, it is subject

to the upper (10,000 pound) threshold planning

quantity as shown in appendices A and B of

40CFR355.

4.4.4 Provisions shall be established to adequately assess the

DOE O 151.1A, Chapter IV,

potential or actual on and offsite consequences of an

sec. 3b(5)

emergency. Consequence assessments shall (a) be timely

throughout the emergency; (b) be integrated with the event

classification and protective action process; (c) incorporate

monitoring of specific indicators and field measurements; and

(d) be coordinated with Federal, State, local, and Tribal

organizations.

4.4.5 A formal exercise program shall be established to validate all

DOE O 151.1A, Chapter IV,

elements of the emergency management program over a multi-

sec. 4b

year period. Each exercise shall have specific objectives and

shall be fully documented. Exercises shall be evaluated using

an established critique process. Corrective actions shall be

identified and incorporated into the program.

4.4.6

Provisions shall be established for prompt initial

DOE O 151.1A, Chapter VIII,

notification of workers and emergency response personnel

sec. 2a

and organizations, including appropriate DOE and NNSA

elements and other Federal, State, Tribal, and local

The 100 micron level may be determined by multiplying the weight percent of solid with a particle size less than

100 microns in a particular container by the quantity of solid in the container.

The amount of solid in solution may be determined by multiplying the weight percent of solid in the solution in a

particular container by the quantity of solution in the container.

The amount of solid in molten form must be multiplied by 0.3 to determine whether the lower threshold planning

quantity is met.