Gwnes gyfeirio at rai anawsterau penodol yn fy natganiad ym mis Ebrill mewn perthynas â llethr ansad, a allai effeithio ar ddyddiad cwblhau'r rhaglen. Dyma'r sefyllfa o hyd ac mae Costain wedi ein hysbysu ers hynny fod y gwaith o adeiladu wal gynnal yn cymryd hirach nag a ragwelwyd yn wreiddiol. O'r herwydd maent wedi estyn dyddiad cwblhau'r rhaglen hyd fis Ebrill 2021. Mae hyn wedi effeithio ar waith cwblhau'r rhan ddwyreiniol o Gilwern i Saleyard. Y bwriad gwreiddiol oedd cwblhau'r gwaith hwnnw erbyn mis Rhagfyr 2019.
In my April statement, I referred to some particular difficulties in relation to an unstable slope, which had the potential to affect the programme end date.   This remains the case and Costain have since advised that the works to build a retaining wall is taking longer than they initially envisaged. Consequently, they have extended the programme end date to April 2021.  This has impacted on completion of the eastern section from Gilwern to Saleyard, which had been scheduled for December 2019.