ABSTRACT
Excavate and form ditch and bank with 45° sides in light to medium soils; all widths taken at bottom of ditch 300mm wide × 600mm deep 100m 105.00 600mm wide × 900mm deep 100m 100.00 1.20m wide × 900mm deep 100m 920.00 1.50m wide × 1.20m deep 100m 1550.00
Clear and bottom existing ditch average 1.50m deep, trim back vegetation and remove debris to licensed tip not exceeding 13 km, lay jointed concrete pipes; including bedding, haunching and topping with 150mm concrete; 11.50N/mm2 – 40mm aggregate; backfill with approved spoil from site Pipes 300mm diameter 100m 6300.00 Pipes 450mm diameter 100m 8000.00 Pipes 600mm diameter 100m 10500.00
SUBSOIL DRAINAGE – BY MACHINE
Main drain; remove 150mm topsoil and deposit alongside trench, excavate drain trench by machine and lay flexible perforated drain; lay bed of gravel rejects 100mm; backfill with gravel rejects or similar to within 150mm of finished ground level; complete fill with topsoil; remove surplus spoil to approved dump on site Main drain 160mm supplied in 35m lengths
450mm deep 100m 700.00 600mm deep 100m 810.00 900mm deep 100m 1350.00
Extra for couplings each 2.30 As above but with 100mm main drain supplied in 100m lengths
450mm deep 100m 1025.00 600mm deep 100m 1375.00 900mm deep 100m 2225.00
Extra for couplings each 1.90
Laterals to mains above; herringbone pattern; excavation and backfilling as above; inclusive of connecting lateral to main drain 160mm pipe to 450mm deep trench
laterals at 1.0m centres 100m² 700.00 laterals at 2.0m centres 100m² 350.00 laterals at 3.0m centres 100m² 230.00 laterals at 5.0m centres 100m² 140.00 laterals at 10.0m centres 100m² 70.00
160mm pipe to 600mm deep trench laterals at 1.0m centres 100m² 810.00 laterals at 2.0m centres 100m² 410.00 laterals at 3.0m centres 100m² 270.00 laterals at 5.0m centres 100m² 160.00 laterals at 10.0m centres 100m² 82.00
Excluding site overheads and profit
160mm pipe to 900mm deep trench laterals at 1.0m centres 100m² 1350.00 laterals at 2.0m centres 100m² 680.00 laterals at 3.0m centres 100m² 450.00 laterals at 5.0m centres 100m² 270.00 laterals at 10.0m centres 100m² 135.00
Extra for 160/160mm couplings connecting laterals to main drain laterals at 1.0m centres 10m 95.00 laterals at 2.0m centres 10m 47.50 laterals at 3.0m centres 10m 31.50 laterals at 5.0m centres 10m 19.00 laterals at 10.0m centres 10m 9.50
100mm pipe to 450mm deep trench laterals at 1.0m centres 100m² 1025.00 laterals at 2.0m centres 100m² 520.00 laterals at 3.0m centres 100m² 340.00 laterals at 5.0m centres 100m² 205.00 laterals at 10.0m centres 100m² 100.00
100mm pipe to 600mm deep trench laterals at 1.0m centres 100m² 1375.00 laterals at 2.0m centres 100m² 680.00 laterals at 3.0m centres 100m² 450.00 laterals at 5.0m centres 100m² 270.00 laterals at 10.0m centres 100m² 135.00
100mm pipe to 900mm deep trench laterals at 1.0m centres 100m² 2225.00 laterals at 2.0m centres 100m² 1125.00 laterals at 3.0m centres 100m² 740.00 laterals at 5.0m centres 100m² 445.00 laterals at 10.0m centres 100m² 220.00
80mm pipe to 450mm deep trench laterals at 1.0m centres 100m² 990.00 laterals at 2.0m centres 100m² 490.00 laterals at 3.0m centres 100m² 325.00 laterals at 5.0m centres 100m² 200.00 laterals at 10.0m centres 100m² 99.00
80mm pipe to 600mm deep trench laterals at 1.0m centres 100m² 1325.00 laterals at 2.0m centres 100m² 660.00 laterals at 3.0m centres 100m² 435.00 laterals at 5.0m centres 100m² 260.00 laterals at 10.0m centres 100m² 130.00
80mm pipe to 900mm deep trench laterals at 1.0m centres 100m² 2175.00 laterals at 2.0m centres 100m² 1075.00 laterals at 3.0m centres 100m² 720.00 laterals at 5.0m centres 100m² 435.00 laterals at 10.0m centres 100m² 220.00
Excluding site overheads and profit
SUBSOIL DRAINAGE – BY MACHINE – cont
Laterals to mains above – cont Extra for 100/80mm junctions connecting laterals to main drain
laterals at 1.0m centres 10m 44.00 laterals at 2.0m centres 10m 22.00 laterals at 3.0m centres 10m 14.60 laterals at 5.0m centres 10m 8.70 laterals at 10.0m centres 10m 4.35
Clay land drain Excavate trench by excavator to 450mm deep; lay 100mm vitrified clay drain with butt joints, bedding Class B; backfill with excavated material screened to remove stones over 40mm; backfill to be laid in layers not exceeding 150mm; top with 150mm topsoil remove surplus material to approved dump on site not exceeding 100m; final level of fill to allow for settlement 100m 1650.00
SUBSOIL DRAINAGE – BY HAND
Main drain; remove 150mm topsoil and deposit alongside trench; excavate drain trench by machine and lay flexible perforated drain; lay bed of gravel rejects 100mm; backfill with gravel rejects or similar to within 150mm of finished ground level; complete fill with topsoil; remove surplus spoil to approved dump on site Main drain 160mm in supplied in 35m lengths
450mm deep 100m 1975.00 600mm deep 100m 2450.00 900mm deep 100m 3300.00
Extra for couplings each 2.30 As above but with 100mm main drain supplied in 100m lengths
450mm deep 100m 1275.00 600mm deep 100m 1625.00 900mm deep 100m 2275.00
Extra for couplings each 1.90
Laterals to mains above; herringbone pattern; excavation and backfilling as above; inclusive of connecting lateral to main drain 160mm pipe to 450mm deep trench
laterals at 1.0m centres 100m² 1975.00 laterals at 2.0m centres 100m² 980.00 laterals at 3.0m centres 100m² 650.00 laterals at 5.0m centres 100m² 390.00 laterals at 10.0m centres 100m² 195.00
160mm pipe to 600mm deep trench laterals at 1.0m centres 100m² 2450.00 laterals at 2.0m centres 100m² 1225.00 laterals at 3.0m centres 100m² 810.00 laterals at 5.0m centres 100m² 490.00 laterals at 10.0m centres 100m² 245.00
Excluding site overheads and profit
160mm pipe to 900mm deep trench laterals at 1.0m centres 100m² 3300.00 laterals at 2.0m centres 100m² 1650.00 laterals at 3.0m centres 100m² 1075.00 laterals at 5.0m centres 100m² 660.00 laterals at 10.0m centres 100m² 330.00
Extra for 160/160mm couplings connecting laterals to main drain laterals at 1.0m centres 10m 95.00 laterals at 2.0m centres 10m 47.50 laterals at 3.0m centres 10m 31.50 laterals at 5.0m centres 10m 19.00 laterals at 10.0m centres 10m 9.50
100mm pipe to 450mm deep trench laterals at 1.0m centres 100m² 1275.00 laterals at 2.0m centres 100m² 640.00 laterals at 3.0m centres 100m² 425.00 laterals at 5.0m centres 100m² 260.00 laterals at 10m centres 100m² 130.00
100mm pipe to 600mm deep trench laterals at 1.0m centres 100m² 1625.00 laterals at 2.0m centres 100m² 820.00 laterals at 3.0m centres 100m² 540.00 laterals at 5.0m centres 100m² 325.00 laterals at 10.0m centres 100m² 160.00
100mm pipe to 900mm deep trench laterals at 1.0m centres 100m² 2275.00 laterals at 2.0m centres 100m² 1150.00 laterals at 3.0m centres 100m² 750.00 laterals at 5.0m centres 100m² 455.00 laterals at 10.0m centres 100m² 230.00
80mm pipe to 450mm deep trench laterals at 1.0m centres 100m² 1250.00 laterals at 2.0m centres 100m² 620.00 laterals at 3.0m centres 100m² 410.00 laterals at 5.0m centres 100m² 250.00 laterals at 10.0m centres 100m² 125.00
80mm pipe to 600mm deep trench laterals at 1.0m centres 100m² 1575.00 laterals at 2.0m centres 100m² 790.00 laterals at 3.0m centres 100m² 520.00 laterals at 5.0m centres 100m² 320.00 laterals at 10.0m centres 100m² 160.00
80mm pipe to 900mm deep trench laterals at 1.0m centres 100m² 2250.00 laterals at 2.0m centres 100m² 1125.00 laterals at 3.0m centres 100m² 740.00 laterals at 5.0m centres 100m² 450.00 laterals at 10.0m centres 100m² 220.00
Excluding site overheads and profit
SUBSOIL DRAINAGE – BY HAND – cont
Laterals to mains above – cont Extra for 100/80mm couplings connecting laterals to main drain
laterals at 1.0m centres 10m 44.00 laterals at 2.0m centres 10m 22.00 laterals at 3.0m centres 10m 14.60 laterals at 5.0m centres 10m 8.70 laterals at 10.0m centres 10m 4.35
SOAKAWAYS
Construct soakaway from perforated concrete rings; excavation, casting in situ concrete ring beam base; filling with gravel 250mm deep; placing perforated concrete rings; surrounding with geofabric and backfilling to external surround of soakaway with 250mm wide granular surround and excavated material; step irons and cover slab; inclusive of all earthwork retention and disposal off site of surplus material 900mm diameter
1.00m deep nr 610.00 2.00m deep nr 1025.00
1200mm diameter 1.00m deep nr 820.00 2.00m deep nr 1375.00
2400mm diameter 1.00m deep nr 2325.00 2.00m deep nr 3800.00
Aquacell Infiltration unit soakaway; 1.00m×500×400mm; 200 litre volume each in trench Excavate for new soakaway; grade bottom of excavation; Lay bedding layer of 100mm sharp sand; Install geotextile to line excavation and bedding; Install Aquacell units in bonded formation; wrap entire installation in geotextile; back filling to surround in MOT Type 2 150mm thick. Place sharp sand over infiltration units; inclusive of connection only of in-flow pipework; Cover over 500 deep with Type 2granular material.
