When the owner or operator who has been issued a two-phase permit has completed the treatment demonstration, he shall submit to the executive director a certification, signed by a person authorized to sign a permit application or report under §305.44 of this title (relating to Signatories to Applications) and §305.128 of this title (relating to Signatories to Reports), that the field tests or laboratory analyses have been carried out in accordance with the conditions specified in phase one of the permit for conducting such tests or analyses. The owner or operator shall also submit all data collected during the field tests or laboratory analyses within 90 days of completion of those tests or analyses unless the executive director approves a later date.