How do I calculate the Total On-site Quantity (TOQ) of COI in a mixture?
A facility compute the TOQ using the same provisions a facility considers when determining whether it possesses a COI in an amount at or above the applicable STQ. Therefore, whether a facility possesses a COI in an amount at or above the applicable STQ should be determined in accordance with the minimum concentration provisions in 6 CFR 27.204 and instructions (as well as for compiling the TOQ and AHQ) can be found in the Top-screen User’s Manual, which is available online at http://www.dhs.gov/xlibrary/assets/chemsec_casttopscreenusersmanual.pdf.
