Where the excavation is greater than 1.5m deep, the trench shall be > 1.5m Deep excavated in accordance with the relevant requirements of Occupational Safety and Health Regulations 1996. Any loose or disturbed material shall be removed from the walls of the trench. Unsuitable material from excavations shall be disposed of in accordance Unsuitable with Specification 302 EARTHWORKS. Material Trench excavations in rock shall be carried out in accordance with Rock Specification 302 EARTHWORKS. Trenches should be graded to have reasonably smooth side and bottom Shape faces so that the geotextile lining will not bridge cavities or be damaged by protruding/sharp objects. Cavities should be filled with granular material before placement of geotextile. The minimum grade of subsoil drainage must be 0.5%. to the placement of Geotextile as detailed in Clause 403.28, the HOLD POINT Contractor shall provide certification to the Superintendent that the trench excavation conforms to the trench shape, grade line, filling and light compaction for over excavated section and removal of any protruding/sharp objects. 403.28 DRAIN LINING The Contractor shall take every reasonable care to ensure that the Care geotextile is not damaged during installation and backfilling operations. Geotextile shall be placed in the excavated trench to cover the bottom and Placement sides of the trench, with sufficient free fabric to wrap around the completed drain as shown on the Drawings. The geotextile should conform to the shape of the trench with minimal wrinkles, folds or air voids between fabric and trench, but not stretched on the soil. Unless otherwise specified on the Drawings, the minimum overlap in Overlap longitudinal direction along the trench shall be 500mm. Successive sheets of geotextile within the trench shall be overlapped with the upstream fabric overlying the downstream fabric. Damaged of geotextile may be repaired by overlaying the damaged Repair section with a patch. The patch shall extend a minimum of 1 m beyond the area of damage. with drainage backfill layer shall not exceed 14 days. Where possible and Exposure practical, geotextiles shall be placed just ahead of associated advancing construction work and covered by relevant construction materials or suitable protective sheeting within 48 hours of being placed. Any fabric allowed to remain exposed to sunlight for a period greater than Prolonged 14 days shall be removed and replaced at no cost to the Principal. Exposure 403.29 BEDDING
Where the excavation is greater than 1.5m deep, the trench shall be excavated in accordance with the relevant requirements of Occupational Safety and Health Regulations 1996. Any loose or disturbed material shall be removed from the walls of the trench. > 1.5m Deep Unsuitable material from excavations shall be disposed of in accordance with Specification 302 EARTHWORKS. Unsuitable Material Trench excavations in rock shall be carried out in accordance with Specification 302 EARTHWORKS. Rock Trenches should be graded to have reasonably smooth side and bottom faces so that the geotextile lining will not bridge cavities or be damaged by protruding/sharp objects. Cavities should be filled with granular material before placement of geotextile. The minimum grade of subsoil drainage must be 0.5%. Shape to the placement of Geotextile as detailed in Clause 403.28, the Contractor shall provide certification to the Superintendent that the trench excavation conforms to the trench shape, grade line, filling and light compaction for over excavated section and removal of any protruding/sharp objects. HOLD POINT 403.28 DRAIN LINING The Contractor shall take every reasonable care to ensure that the geotextile is not damaged during installation and backfilling operations. Care Geotextile shall be placed in the excavated trench to cover the bottom and sides of the trench, with sufficient free fabric to wrap around the completed drain as shown on the Drawings. The geotextile should conform to the shape of the trench with minimal wrinkles, folds or air voids between fabric and trench, but not stretched on the soil. Placement Unless otherwise specified on the Drawings, the minimum overlap in longitudinal direction along the trench shall be 500mm. Successive sheets of geotextile within the trench shall be overlapped with the upstream fabric overlying the downstream fabric. Overlap Damaged of geotextile may be repaired by overlaying the damaged section with a patch. The patch shall extend a minimum of 1 m beyond the area of damage. Repair with drainage backfill layer shall not exceed 14 days. Where possible and practical, geotextiles shall be placed just ahead of associated advancing construction work and covered by relevant construction materials or suitable protective sheeting within 48 hours of being placed. Exposure Any fabric allowed to remain exposed to sunlight for a period greater than 14 days shall be removed and replaced at no cost to the Principal. Prolonged Exposure 403.29 BEDDING