25 Pa. Code § 298.62
(b) Mechanics of notification. A waste oil burner who has not received an identification number may obtain one by notifying the regional administrator of their waste oil activity by submitting one of the following:
(2) A letter requesting an identification number. A burner may call the RCRA/Superfund hotline to determine where to send a letter requesting an identification number. The letter should include the following information: