flooding. Designer shall show circuits on the drawings. //D. Manhole Lighting: Provide NEMA 3R lighting switch mounted no more than 600 mm (2 feet) from top of ladder and a 27 W compact fluorescent wet location light fixture in manhole. Provide dedicated 20 mm (0.75 inch) direct-buried conduit and conductors to nearest electrical panelboard.// //E. Sump Pump: Provide 120V cord and plug connected sump pump complete with float switch, thermal overload protection, and GFCI receptacle mounted in NEMA 3R boxes in manhole. Provide dedicated 20 mm (0.75 inch) conduit and conductors to nearest electrical panelboard.// 3.2 TRENCHING A. Refer to //Section 31 20 00, EARTH MOVING// //Section 31 20 11 EARTH MOVING (SHORT FORM)// for trenching, backfilling, and compaction. B. Before performing trenching work at existing facilities, a Ground Penetrating Survey shall be carefully performed by a certified technician to reveal all existing underground ducts, conduits, cables, and other utility systems. C. Work with extreme care near existing ducts, conduits, and other utilities to avoid damaging them. D. Cut the trenches neatly and uniformly. E. For Concrete-Encased Ducts: 1. After excavation of the trench, stakes shall be driven in the bottom of the trench at 1.2 M (4 feet) intervals to establish the grade and route of the duct bank. 2. Pitch the trenches uniformly toward manholes or both ways from high points between manholes for the required duct line drainage. Avoid pitching the ducts toward buildings wherever possible. 3. The walls of the trench may be used to form the side walls of the duct bank, provided that the soil is selfsupporting and that the concrete envelope can be without soil inclusions. Forms are required where the soil is not selfsupporting. 4. After the concrete-encased duct has sufficiently cured, the trench shall be backfilled to grade with earth, and appropriate warning tape installed. F. Individual conduits to be installed existing paved areas and roads that cannot be disturbed shall be jacked into place using rigid metal conduit, or bored using plastic utilities duct or PVC conduit, as approved by the //Resident Engineer// //COR//.
flooding. Designer shall show circuits on the drawings. //D. Manhole Lighting: Provide NEMA 3R lighting switch mounted no more than 600 mm (2 feet) from top of ladder and a 27 W compact fluorescent wet location light fixture in manhole. Provide dedicated 20 mm (0.75 inch) direct-buried conduit and conductors to nearest electrical panelboard.// //E. Sump Pump: Provide 120V cord and plug connected sump pump complete with float switch, thermal overload protection, and GFCI receptacle mounted in NEMA 3R boxes in manhole. Provide dedicated 20 mm (0.75 inch) conduit and conductors to nearest electrical panelboard.// 3.2 TRENCHING A. Refer to //Section 31 20 00, EARTH MOVING// //Section 31 20 11 EARTH MOVING (SHORT FORM)// for trenching, backfilling, and compaction. B. Before performing trenching work at existing facilities, a Ground Penetrating Survey shall be carefully performed by a certified technician to reveal all existing underground ducts, conduits, cables, and other utility systems. C. Work with extreme care near existing ducts, conduits, and other utilities to avoid damaging them. D. Cut the trenches neatly and uniformly. E. For Concrete-Encased Ducts: 1. After excavation of the trench, stakes shall be driven in the bottom of the trench at 1.2 M (4 feet) intervals to establish the grade and route of the duct bank. 2. Pitch the trenches uniformly toward manholes or both ways from high points between manholes for the required duct line drainage. Avoid pitching the ducts toward buildings wherever possible. 3. The walls of the trench may be used to form the side walls of the duct bank, provided that the soil is selfsupporting and that the concrete envelope can be without soil inclusions. Forms are required where the soil is not selfsupporting. 4. After the concrete-encased duct has sufficiently cured, the trench shall be backfilled to grade with earth, and appropriate warning tape installed. F. Individual conduits to be installed existing paved areas and roads that cannot be disturbed shall be jacked into place using rigid metal conduit, or bored using plastic utilities duct or PVC conduit, as approved by the //Resident Engineer// //COR//.
VA%2026%2005%2041.docx