Code of Federal Regulations Title 40. Protection of Environment § 40.761.353 Second level of sample selection

(a) Selecting a portion of the subsample for particle size reduction. At the chemical extraction and analysis laboratory, pour the 19–liter subsample onto a plastic sheet or into a pan and divide the subsample into quarters. Use a random number generator or random number table to select one of these quarters.

(b) Reduction of the particle size by the use of a 9.5 mm screen. Collect the contents of the selected quarter of waste resulting from conducting the procedures in paragraph (a) of this section and shake the waste in a 9.5 mm screen. Separate the waste material which passes through the screen from the waste material which does not pass through the screen. Manually cut or otherwise reduce the size of all parts of the waste portion which did not pass through the 9.5 mm screen, such that each part of the waste shall pass through the 9.5 mm screen by shaking.

(c) Drying the reduced particle size waste. Dry all of the waste portion resulting from conducting the procedures in paragraph (b) of this section, from 10 to 15 hours in a drying oven at 100 °C. Allow the dried waste to cool to room temperature.

(d) Mixing the dried waste. Place all of the waste resulting from conducting the procedures in paragraph (c) of this section in a 19–liter pail or similarly sized, cylinder-shaped container. Mix the dried material according to one of the two following options: