The commission or the director, in preparing a list of handlers to be used pursuant to this chapter, may omit from the list any person who functions as a handler, but who handles less than 250,000 pounds of iceberg lettuce during a marketing season. Any person so omitted from the list is not subject to this chapter, including the payment of any assessments, and is not qualified as a handler under this chapter. Any person omitted from a list pursuant to this section may be included on any subsequent list if found qualified as a handler at the time of preparing the list.