We aim to get the survey approved within twenty working days but it is advisable to submit the proposed survey well in advance of the field work start date.
Anelwn at sicrhau cymeradwyaeth i arolygon o fewn ugain diwrnod gwaith ond fe’ch cynghorir i gyflwyno’r arolwg arfaethedig ymhell cyn dyddiad cychwyn y gwaith maes.