The plan exercise (tabletop, functional, mock drill, etc.) shall be held annually on or before this date. Modifications triggered by post-incident review should be proposed to the Local Emergency Planning Committee (LEPC). as a whole and changes in procedures made to the plan. If major modifications are made to the LEPC plan, those changes should then be tested in a functional exercise scheduled no later than August of the following year. This will enable the LEPC to determine if the aforementioned changes have adequately addressed the deficiencies discovered, and still make any additional modifications before the annual October 16 re-submission date to the SERC.