7 Del. Admin. Code § 7102-27.0
The Department may require, by written notice, an owner or operator of an injection well to establish and maintain records, make reports, conduct monitoring, and provide other information as is deemed necessary to determine whether the owner or operator has acted or is acting in compliance with these Regulations. All records shall be maintained for a minimum of five (5) years beyond Permit expiration date. All records and information resulting from the monitoring activities required by this Permit including all records of analyses performed calibration and maintenance of instrumentation and recording from continuous monitoring instrumentation shall be retained for five (5) years. This period of retention shall be automatically extended during the course of any unresolved litigation regarding the regulated activity or regarding control standards applicable to the permittee, or as requested by the Department.
7 Del. Admin. Code § 7102-27.0