Rule 18. The following permit records shall be retained for the periods listed:
(a) Permits and granted applications for the use of facilities of others. | 6 years after expiration or cancellation. |
(b) Copies of permits and applications granted others for the use of the utility's facilities. | 6 years after expiration or cancellation. |
(c) Applications for the use of facilities not granted and copies of such applications. | Destroy at option. |
(d) Permits of a temporary nature from municipalities or others to perform specific work, such as permits to open streets. | Destroy at option. |
Mich. Admin. Code R. 460.2518