04
GENERAL CONCRETE SPECIFICATION
IN ACCORDANCE WITH BS EN 206-1 ( BS 8500-1)
TYPE OF MIX (DC) DESIGN
PERMITTED TYPE OF CEMENT BS 12 (OPC): BS 12 (RHPC): BS 4027 (SRPC)
PERMITTED TYPE OF AGGREGATE
(coarse & ne)
BS 882
NOMINAL MAXIMUM SIZE OF AGGREGATE 20 mm
GRADES: C25 /30
C25 /30
C16 /20
REINFORCED & ABOVE GROUND WITH HOLDING
DOWN BOLTS
REINFORCED (EG. FOR HIGH WATER TABLE)
UNREINFORCED (NORMAL CONDITIONS)
MINIMUM CEMENT
CONTENT
C30
C20
270 - 280 Kg/M
3
220 - 230 Kg/M
3
SLUMP CLASS S1 (25mm)
RATE OF SAMPLING READY MIX CONCRETE SHOULD BE SUPPLIED
COMPLETE WITH APPROPRIATE DELIVERY
TICKET IN ACCORDANCE WITH BS EN 12350-1
NOTE: STANDARD MIXES SHOULD NOT BE USED WHERE SULPHATES OR OTHER AGGRESSIVE
CHEMICALS EXIST IN GROUND WATER
3.4 TANK INSTALLATION
3.4.1 DRY GROUND CONDITIONS.
3.4.2 Excavate the site, allowing for a minimum clearance on all sides and base of the unit of 200mm
and level the base.
3.4.3 Ensure that the hole is kept dry. Should any rain or surface water collect in the hole, this should be
pumped out.
3.4.4 A base of at least 200mm of lean mix concrete should be provided.
3.4.5 Lower the tank into the hole:
ENV040:- use a rope sling underneath the tank (Under no circumstances should the sling be
attached to the inlet pipe or the outlet pipe).
ENV060 & ENV120:- use a rope sling through the lifting points provided on the tank
(Under no circumstances should the sling be attached to the inlet pipe or the outlet pipe).
3.4.6 Position the inlet pipe in line with the incoming drain. Note that the inlet and the outlet pipes are clearly
embossed on the tank. The unique profile of the base will help to level the tank, but make sure the tank is in
the truly upright position in order to maintain the 50mm head difference between the inlet and outlet pipes.
3.4.7 After any concrete in the base has taken up its initial set (usually after one day), ballast the tank by putting
approximately 0.5m depth of water into it.
3.4.8 Backfill the space around the tank with pea gravel or similar material (PEA SHINGLE ONLY TO BE USED
IN DRY SITE CONDITIONS). The backfill should be free from organic material, large stones, bricks or sharp
objects. Backfilling should be carried out in layers, making sure that voids are not left under and around the
sides of the tank and that there are no localized stress concentrations. It is most important that the installer
progressively fills the tank with water to the level above the backfill in order to stabilize pressures on the tank.
3.4.9 See section 4 ‘System Installation’ for connecting all pipe work.
3.4.10 Backfilling can now proceed up to ground level in 300mm stages ensuring tank is ballasted in
all chambers as you go.
3.4.11 A galvanized lockable manhole cover (600x600mm) and frame is to be fitted to suit specific site loadings,
THE TANK MUST NOT BE LOAD BEARING. The top of the manhole should not be sat below the local ground
level. If necessary you should use brick work above the tank to bring the cover up to ground level.
3.4.12 Venting is provided on all tanks and must be used, ventilation to be run above ground level and finished
with necessary rodent protection.
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