(a) Unless otherwise precluded by law, the department may, upon written application from any person who is subject to this Part, grant a variance from one or more provisions of this Part except the performance objectives under the conditions set forth in this Subpart. An application for a variance must:

1. (1) identify the specific provisions of this Part from which a variance is sought;
2. (2) demonstrate to the satisfaction of the department that compliance with the identified provision would impose on the applicant or the public an unreasonable safety or economic hardship;
3. (3) demonstrate to the satisfaction of the department that, with the requested variance in effect, there would be reasonable assurance that the performance objectives would be met; and

4. (4) demonstrate to the satisfaction of the department that the requested variance would:

   1. (i) cause no significant adverse impact on the environment, natural resources, or the public health, safety and welfare; and
   2. (ii) would be consistent with the other provisions of the ECL and this Part and Part 382 of this Title.