Government destruction of documents Regulations

The "secure volume" concept of destruction processing stresses that security is enhanced not only by small residue particle size but also by restricting the chances of successful reconstruction of that residue by increasing the number of pieces involved.

This increase can be achieved in two ways: prohinit destruction until quantity of no less than 20 similar pages of classified paper are destroyed at ome time, or add sufficient similar type of unclassified pages of paper to the classified document to arrive at the minimum 20 similar page count. Either method will result in a "secure volume" of residue. (Army Regulation 380-5, Appendix K2, paragraph a)