A BY-LAW TO ESTABLISH SCHEDULES FOR RETENTION PERIODS DURING WHICH CERTAIN receipts, vouchers, instruments, rolls or other documents, records and papers must be kept by North Bay Hydro Electric Commission, pursuant to section 248b (b) of the municipal act, chapter 249, R.S.O. 1960, as amended: and providing for the destruction of certain receipts, vouchers, instruments, rolls or other documents, records and papers thereof.