Notice required before plant closings and mass layoffs

An employer shall not order a plant closing or mass layoff until the end of a 60-day period after the employer serves written notice of such an order— A layoff of more than 6 months which, at its outset, was announced to be a layoff of 6 months or less, shall be treated as an employment loss under this chapter unless— For purposes of this section, in determining whether a plant closing or mass layoff has occurred or will occur, employment losses for 2 or more groups at a single site of employment, each of which is less than the minimum number of employees specified in section 2101(a)(2) or (3) of this title but which in the aggregate exceed that minimum number, and which occur within any 90-day period shall be considered to be a plant closing or mass layoff unless the employer demonstrates that the employment losses are the result of separate and distinct actions and causes and are not an attempt by the employer to evade the requirements of this chapter.