The risk of pollution is site-specific and depends on a number of factors, including the volume and type of carcasses, the method of burial, the surrounding geology and the depth of the water table.
Mae’r perygl o lygredd yn dibynnu ar nifer o ffactorau ar y safle, gan gynnwys nifer y carcasau, y math o garcasau, sut cawsant eu claddu, daeareg y safle a dyfnder y lefel trwythiad.