Section 27.11 - Recordkeeping and Reporting(1) The owner and operator of a registered Class IV or Class V well shall make all existing records and information concerning the construction and operation of the well available to the Department within ten days of receipt of a request by the Department, unless the Department agrees in writing to a later date.(2) Records shall be kept by the owner and operator of a registered Class IV or Class V well for a period of at least three years from the date of any sample, measurement, report, or application. This period may be extended by request of the Department.(3) Records associated with the nature and composition of all injected fluids shall be kept by the owner and operator for a period of at least three years from the date of closure of a registered Class IV or Class V well.(4) If requested by the Department, the owner and operator of a registered Class IV or Class V well shall deliver records kept pursuant to 310 CMR 27.11 to the Department, in an electronic format or another format acceptable to the Department, at the conclusion of their retention period.Amended by Mass Register Issue 1322, eff. 9/23/2016.