ABSTRACT
Excavate existing slope to vertical to form flat area; grade bank behind to 45°; no allowance for removal or backfilling of excavated materials; Existing slope angle 10°; excavation by 7 tonne machine; excavated material to location on-site 50m distant; linear measurement of flat area at the base of the slope;
2.00m wide; height 350mm m 3.70 4.00m wide; height 860mm m 14.60 6.00m wide; height 1.28m m 33.00 8.00m wide; height 1.71m m 59.00 10.00m wide; height 2.14m m 92.00
Existing slope angle 20°; excavation by 7 tonne machine; excavated material to loctaion on-site 50m distant; linear measurement of flat area at the base of the slope;
2.00m wide; height 1.14m m 9.80 4.00m wide; height 2.29m m 39.00 6.00m wide; height 3.43m m 88.00 8.00m wide; height 4.58m m 155.00 10.00m wide; height 5.72m m 240.00
Excavate and grade banks to grade to receive stabilization treatments below; removal of excavated material not included By 21 tonne excavator m3 0.35 By 7 tonne excavator m3 2.40 By 5 tonne excavator m3 2.80 By 3 tonne excavator m3 4.20
Excavate sloped bank to vertical to receive retaining or stabilization treatment (priced separately); allow 1.00m working space at top of bank; backfill working space and remove balance of arisings off site; measured as length along the top of the bank Bank height 1.00m; excavation by 5 tonne excavator
10 degree m 71.00 30 degree m 22.00 45 degree m 12.70 60 degree m 7.35
Bank height 1.00m; excavation by 5 tonne excavator; arisings moved to stockpile on site
10 degree m 12.30 30 degree m 6.25 45 degree m 3.60 60 degree m 2.10
Bank height 2.00m; excavation by 5 tonne excavator 10 degree m 290.00 30 degree m 86.00 45 degree m 51.00 60 degree m 29.00
Bank height 2.00m; excavation by 5 tonne excavator but arisings moved to stockpile on site
10 degree m 81.00 30 degree m 24.50 45 degree m 14.40 60 degree m 8.30
£ Excluding site overheads and profit
Bank height 3.00m; excavation by 21 tonne excavator 20 degree m 265.00 30 degree m 170.00 45 degree m 92.00 60 degree m 50.00
As above but arisings moved to stockpile on site 20 degree m 41.00 30 degree m 26.00 45 degree m 10.40 60 degree m 5.70
Excavating generally
Prices for excavating and reducing to levels are for work in light or medium soils; multiplying factors for other soils are as follows Clay 1.5 – Compact gravel 1.2 – Soft chalk 2.0 – Hard rock 3.0 –
Excavating topsoil for preservation Remove topsoil average depth 300mm; deposit in spoil heaps not exceeding 100m travel to heap; turn heap once during storage
by machine m³ 13.40 by hand m³ 120.00
Excavate to reduce levels; remove spoil to stockpile not exceeding 100m travel; all by machine Average 0.25m deep m² 2.05 Average 0.25m deep m3 8.30 Average 0.30m deep m² 2.50 Average 0.30m deep m3 7.70 Average 1.0m deep; using 21 tonne 360 tracked excavator m3 4.80 Average 1.0m deep; using JCB m3 7.70
Excavate to reduce levels; remove spoil to stockpile not exceeding 100m travel; all by hand Average 0.10m deep m² 10.60 Average 0.20m deep m² 21.00 Average 0.30m deep m² 32.00 Average 100-300mm deep m3 105.00 Average 1.0m deep m3 120.00 Extra for carting spoil to licensed tip off site (20 tonnes) m³ 23.00 Extra for carting spoil to licensed tip off site (by skip; machine loaded) m3 49.00 Extra for carting spoil to licensed tip off site (by skip; hand loaded) m3 105.00
Spread excavated material to levels in layers not exceeding 150mm; using scraper blade or bucket Average thickness 100mm m2 0.60 Average thickness 100mm but with imported topsoil m2 4.30 Average thickness 200mm m2 1.25
£ Excluding site overheads and profit
Excavating generally – cont
Spread excavated material to levels in layers not exceeding 150mm – cont Average thickness 200mm but with imported topsoil m2 8.55 Average thickness 250mm m2 1.60 Average thickness 200-250mm m3 6.30 Average thickness 250mm but with imported topsoil m2 10.70 Average thickness 250mm but with imported topsoil m3 43.00 Extra for work to banks exceeding 30 degree slope 30% -
Rip subsoil using approved sub-soiling machine to a depth of 600mm below topsoil at 600mm centres; all tree roots and debris over 150×150mm to be removed; cultivate ground where shown on drawings to depths as shown 100mm 100m² 9.55 200mm 100m² 9.90 300mm 100m² 10.50 400mm 100m² 15.10
Form landform from imported material; mounds to falls and grades to receive turf or seeding treatments; material dumped by 20 tonne vehicle to location; volume 100m3 spread over area; thickness varies from 150-500mm; prices to not include for surface preparations Imported standard grade topsoil
by large excavator m3 34.00 by 5 tonne excavator m3 36.50 by 3 tonne excavator m3 38.00
Form landform from excavated material; mounds to falls and grades to receive turf or seeding treatments; material moved by dumper to location maximum 50m; volume 100m3 spread over a 200m2 area; thickness varies from 150-500mm; prices to not include for surface preparations Imported recycled topsoil
by large excavator m3 3.60 by 5 tonne excavator m3 6.05 by 3 tonne excavator m3 7.45
EXCAVATION OF TRENCHES
Excavate trenches for foundations; trenches 225mm deeper than specified foundation thickness; pour plain concrete foundations GEN 1 10N/mm and to thickness as described; disposal of excavated material off site; dimensions of concrete foundations 250mm wide × 250mm deep m 11.30 300mm wide × 300mm deep m 15.10 400mm wide × 600mm deep m 37.00 600mm wide × 400mm deep m 38.50
£ Excluding site overheads and profit
Excavate trenches for foundations; trenches 225mm deeper than specified foundation thickness; pour plain concrete foundations GEN 1 10N/mm and to thickness as described; disposal of excavated material off site; dimensions of concrete foundations 250mm wide × 250mm deep m³ 210.00 300mm wide × 300mm deep m³ 165.00 600mm wide × 400mm deep m³ 160.00 400mm wide × 600mm deep m³ 140.00
Excavate trenches for services; grade bottoms of excavations to required falls; remove 20% of excavated material off site Trenches 300mm wide
600mm deep m 6.20 750mm deep m 8.00 900mm deep m 9.60 1.00m deep m 10.60
Ha-ha Excavate ditch 1200mm deep × 900mm wide at bottom battered one side 45 degree slope; excavate for foundation to wall and place GEN 1 concrete foundation 150×500mm; construct one and a half brick wall (brick PC £300.00/1000) battered 10° from vertical; laid in cement: lime: sand (1:1:6) mortar in English garden wall bond; precast concrete coping weathered and throated set 150mm above ground on high side; rake bottom and sides of ditch and seed with low maintenance grass at 35 g/m²
wall 600mm high m 260.00 wall 900mm high m 325.00 wall 1200mm high m 405.00
Excavate ditch 1200mm deep × 900mm wide at bottom battered one side 45 degree slope; place deer or cattle fence 1.20m high at centre of excavated trench; rake bottom and sides of ditch and seed with low maintenance grass at 35 g/m²
fence 1200mm high m 20.00
Soil stabilization
Please refer to slope excavation above for preparation of banks
REVETMENTS
Gabion mattress revetments Construct revetment of Maccaferri Ltd Reno mattress gabions laid on firm level ground; tightly packed with broken stone or concrete and securely wired; all in accordance with manufacturer’s instructions
gabions 6×2 × 0.17m; one course m² 36.00 gabions 6×2 × 0.17m; two courses m² 60.00
£ Excluding site overheads and profit
Soil stabilization – cont
Grass concrete; bank revetments; excluding bulk earthworks Bring bank to final grade by machine; lay regulating layer of Type 1; lay filter membrane; lay 100mm drainage layer of broken stone or approved hardcore 28-10mm size; blind with 25mm sharp sand; lay grass concrete surface (price does not include edgings or toe beams); fill with approved topsoil and fertilizer at 35 g/m2; seed with dwarf rye based grass seed mix
Grasscrete in situ reinforced concrete surfacing GC 1; 100mm thick m² 58.00 Grasscrete in situ reinforced concrete surfacing GC 2; 150mm thick m² 70.00 Grassblock 103mm open matrix blocks; 406×406×103mm m² 54.00
Grade slope to even grade; Stabilize river bank edge with woven willow walling; lay bank stabilization mat pinned to graded embankment 5m long(measured per m of river bank edge Slope edge to river bank 5m long seeded with Greenfix stabilization matting
Live willow walling 1.20m high along river bank m 155.00 Brushwood faggott and pre-planted coir revetment edge m 170.00 Brushwood faggott revetment edge m 150.00
Neoweb: cellular slope retention; clear existing bank of light scrub, shrubs and grasses; spray with glyphosate; grade surface only to even grade by machine and final hand grade; lay soil retaining system Backfilled with excavated material
100mm deep m2 14.40 200mm deep m2 24.00
Backfilled with ballast 100mm deep m2 16.60 200mm deep m2 28.00
Backfilled with concrete 10Nmm 100mm deep m2 20.50 200mm deep m2 37.00
Backfilled with imported topsoil and seeded 100mm deep m2 19.50
SOIL REINFORCEMENT
Geogrid soil reinforcement (Note: measured per metre run at the top of the bank)
Backfill excavated bank; lay Tensar geogrid; cover with excavated material as work proceeds 2.00m high bank; geogrid at 1.00m vertical lifts
10 degree slope m 600.00 20 degree slope m 335.00 30 degree slope m 240.00
2.00m high bank; geogrid at 0.50m vertical lifts 45 degree slope m 61.00 60 degree slope m 48.00
£ Excluding site overheads and profit
3.00m high bank 10 degree slope m 600.00 20 degree slope m 335.00 30 degree slope m 240.00 45 degree slope m 520.00
EROSION CONTROL
Bank stabilization; erosion control mats Excavate fixing trench for erosion control mat 300× 300mm; backfill after placing mat selected below m 6.85
To anchor trench above; place mat to slope to be retained; allow extra over to the slope for the area of matting required to the anchor trench By machine; final grade only of excavated bank by excavator; lay erosion control solution; sow with low maintenance grass at 35 g/m2; spread imported topsoil 25mm thick incorporating medium grade sedge peat at 3 kg/m2 and fertilizer at 30 g/m2; water lightly
unseeded Eromat Light m² 2.80 seeded Covamat Standard m² 3.40 lay Greenfix biodegradable pre-seeded erosion control mat; fix with 6 × 300mm steel pegs at 1.0m centres m2 3.90 Tensar open textured erosion mat m² 5.45
By hand; final grade only of excavated bank by hand; lay erosion control solution; sow with low maintenance grass at 35 g/m2; spread imported topsoil 25mm thick incorporating medium grade sedge peat at 3 kg/m2 and fertilizer at 30 g/m2; water lightly
unseeded Eromat Light m² 3.25 seeded Covamat Standard m² 3.90 lay Greenfix biodegradable pre-seeded erosion control mat; fix with 6 × 300mm steel pegs at 1.0m centres m2 4.40 Tensar open textured erosion mat m² 5.90
Cellular retaining systems; final grade to excavated bank by machine and by hand; lay bank retaining system Cellweb; filling with angular aggregate; m 24.00
Haul road for site enablement Reduce existing soil to stockpile on site; Lay Tensar Biaxial geogrid on 200mm compacted hardcore base; backfill with 200mm Type 1granular fill and compact m2 19.60 Reduce existing soil to stockpile on site; Lay 200mm compacted hardcore base blinded with 50mm sharp sand; Lay Cellweb load support m2 34.50
