Mich. Admin. Code R. 460.2569a
Rule 69a. The following gas transmission and distribution records shall be retained for the periods listed:
(a) Transmission line logs. | If records are not disputed or adjusted, destroy after 1 year. |
(b) Transmission and distribution department load dispatching operating logs. | If records are not disputed or adjusted, destroy after 1 year. |
(c) Service interruption logs and reports. | 6 years. |
(d) Records of general inspections and operating tests. | 3 years. |
(e) Reports on inspections and repairs of all street openings. | 6 years. |
(f) Apparatus failure reports. | 6 years. |
(g) Records of meter tests. | Until superseding test, but not less than 2 years or as may be necessary to comply with service rules regarding refunds on fast meters. |
(h) Meter history records. | For the life of the meter. |
(i) Meter shop reports that are monthly reports summarizing tests and repairs. | 3 years. |
(j) Gas measuring records. | 1 year, unless measurement data have been disputed or adjusted. |
(k) Transmission line operating reports. | 1 year, unless measurement data have been disputed or adjusted. |
(l) Compressor operation and reports. | 1 year, unless measurement data have been disputed or adjusted. |
(m) Gas pressure department reports. | 1 year, unless measurement data have been disputed or adjusted. |
(n) Recording instrument charts, such as pressure (static and differential), temperature, specific gravity, and heating value. | 1 year, unless measurement data have been disputed or adjusted; except that where charts are exchanged with the customer and the basic information is transferred to another record, the charts shall be retained for only 6 months if the record that contains the basic chart data is retained for 1 year. |
Mich. Admin. Code R. 460.2569a