Mae'n adroddiad eang. Mae'n mynd i'r afael ag effaith y datblygiad ar ecosystem Môr Hafren ac ar iechyd rhywogaethau pysgod; y trefniadau ar gyfer carthu a gwaredu morol ym Mastiroedd Caerdydd; trefniadau cynllunio brys ac wrth gefn; a'r berthynas rhwng cyfundrefnau rheoleiddio a chynllunio yng Nghymru a Lloegr.
It is a wide-ranging report. It addresses the effect of the development on the Severn Estuary ecosystem and on the health of fish species; the Cardiff Grounds and the arrangements for marine dredging and disposal; emergency and contingency planning arrangements; and the relationship between regulatory and planning regimes in Wales and England.