Bydd yr adolygiad, sy'n rhan o'r Cytundeb Cydweithio rhwng Llywodraeth Cymru a Phlaid Cymru, yn ystyried tystiolaeth o ymchwiliadau a gynhelir gan awdurdodau lleol a Cyfoeth Naturiol Cymru, yn ogystal ag adroddiadau perthnasol eraill.
The review, which is part of the Co-operation Agreement between the Welsh Government and Plaid Cymru, will consider evidence from investigations carried out by local authorities and Natural Resources Wales, as well as other relevant reports.