Sewage Disposal Works, Tremeirchion, St Asaph, Denbighshire,
Newid defnydd tir ac adeiladu Gwlyptir Triniaeth Adeiledig Integredig (GTAI) gan gynnwys gosod 2 fflat. tanciau septig tanddaearol, creu 3 rhif. celloedd gwlyptir gyda phlanhigion, cyfleuster lles, ffyrdd mynediad mewnol newydd, ffensys, tirlunio a gwaith cysylltiedig / Change of use of land and construction of an Integrated Constructed Treatment Wetland (ICTW) including the installation of 2 no. underground septic tanks, creation of 3 no. wetland cells with planting, welfare facility, new internal access roads, fencing, landscaping and associated works