94 STAT. 1234
PUBLIC LAW 96-364—SEPT. 26, 1980 "APPLICATION OF PLAN AMENDMENTS
29 USC 1394.
"SEC. 4214. (a) No plan rule or amendment adopted after January 31, 1981, under section 4209 or 4211(c) may be applied without the employer's consent with respect to liability for a withdrawal or partial withdrawal which occurred before the date on which the rule or amendment was adopted. "(b) All plan rules and amendments authorized under this part shall operate and be applied uniformly with respect to each employer, except that special provisions may be made to take into account the creditworthiness of an employer. The plan sponsor shall give notice to all employers who have an obligation to contribute under the plan and to all employee organizations representing employees covered under the plan of any plan rules or amendments adopted pursuant to this section. "PLAN NOTIFICATION TO CORPORATION OF POTENTIALLY SIGNIFICANT WITHDRAWALS
29 USC 1395.
"SEC. 4215. The corporation may, by regulation, require the plan sponsor of a multiemployer plan to provide notice to the corporation when the withdrawal from the plan by any employer has resulted, or will result, in a significant reduction in the amount of aggregate contributions under the plan made by employers. "SPECIAL RULES FOR SECTION 404(C) PLANS
29 USC 1396. Ante, p. 1216.
Post, p. 1252.
"SEC. 4216. (a) In the case of a plan described in subsection (b)— "(1) if an employer withdraws prior to a termination described in section 4041A(a)(2), the amount of withdrawal liability to be paid in any year by such employer shall be an amount equal to the greater of— "(A) the amount determined under section 4219(c)(l)(C)(i), or "(B) the product of— "(i) the number of contribution base units for which the employer would have been required to make contributions for the prior plan year if the employer had not withdrawn, multiplied by "(ii) the contribution rate for the plan year which would be required to meet the amortization schedules contained in section 4243(d)(3)(B)(ii) (determined without regard to any limitation on such rate otherwise provided by this title) except that an employer shall not be required to pay an amount in excess of the withdrawal liability computed with interest; and "(2) the withdrawal liability of an employer who withdraws after December 31, 1983, as a result of a termination described in section 4041A(a)(2) which is agreed to by the labor organization that appoints the employee representative on the joint board of trustees which sponsors the plan, shall be determined under subsection (c) if— "(A) as a result of prior employer withdrawals in any plan year commencing after January 1, 1980, the number of contribution base units is reduced to less than 67 percent of the average number of such units for the calendar years 1974 through 1979; and
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