Gallaf bellach gadarnhau bod oedi o ran y prosiect a bod y costau wedi cynyddu yn sgil yr anawsterau sy'n bodoli ar y safle. Mae Costain wedi nodi mai'r prif reswm am hyn yw'r angen am ateb adeiladu cymhleth ar gyfer mynd i'r afael â nodwedd ddaearegol y maent wedi'i darganfod mewn un lleoliad penodol. Bydd yr ateb sydd ei angen yn effeithio ar y costau a hefyd y rhaglen adeiladu.
Further to the above, the project has experienced delays and cost increases due to difficulties experienced on site. Costain has highlighted that the primary reason for this is due to a complex construction solution required to address the geological feature that they have discovered in one particular location along the scheme. The solution required will impact on the construction costs and programme.