STORAGE SEGREGATION MATRIX: HCCs TO STORAGE SEGREGATION
1. The storage segregation matrix in this appendix consists of four essential elements: (1) The Hazard
characteristic Code (HCC); (2) the HCC group name in the clear; (3) the primary segregation required by
Hazard Storage Area Code (HSAC); and (4) the secondary storage required (if any) within the primary
2. The 63 HCCs are associated with one of the 10 HSACs in the matrix. Once a hazardous material has
been assigned a permanent or temporary HCC, the primary storage site may be determined by using the
matrix. Two HCCs, H1 and X1, which are defined in Appendix B are not included in this segregation
matrix as they are system derived HCCs which are not actually used for physical storage.
3. The storing installation is further responsible for segregating hazardous materials within the primary area
if secondary segregation is required. For instance, HCC F6, a multiple hazard material, which is both
flammable and corrosive, acid will be assigned to primary segregation code "F", Flammable Storage Area.
HCC F7, another multiple hazard material, which is both an flammable and corrosive, alkali will also be
assigned to primary segregation code "F", Flammable Storage Area. These two HCCs are incompatible
with each other and must be kept separate by at least one 4 foot aisle width horizontally. Vertical
separation must assure that incompatible products cannot leak and contact one another.
4. To further assist in the secondary segregation of hazardous materials, a system of notes has been
established. The purpose of this system is to highlight those products that offer truly unique and unusual
problems in storage. These products may require secondary segregation within the primary storage area or
may present such unusual problems that they must be completely segregated from all other products.
PRIMARY SEGREGATION CODE
Low Hazard (General Purpose)