5_Vol3_d4.3_Section 5 Earth and pipe works_en_GIR_rev6.docx  Larger stones shall be used at the edges of the stone surfaces, especially at the skirts of sloped surfaces. Stoned shall be laid from bottom to the top. Mortar, cement and water shall be in accordance  with the herewith Employer’s Requirements, Section 6: Concrete and Steel Works.  The void between the stones shall be filled completely with mortar, and stones shall be hammered af- ter laying to get a strong bond between stones.   Before the stones are placed, ground surface shall be arranged smooth and parallel to the finished sur- face considering the stone thickness and wall slope. Wall thickness shown on the Drawings or speci- fied by the Engineer must be achieved with a single stone layer, and two stone layers on top of each  other will not be accepted. If it is foreseen by the Contractor to build a mortared stone walls and slabs for flood protection or any  other reason, the mortared stone walls and slabs will be constructed according to the following provi- sions.  5.5.3 Mortared stone walls and slabs  49 of 49 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 05: Earth Works, Pipe Works and Ground Improvement 