03
3.2.7 DO:-
3.2.8 Use the correct backfill material.
3.2.9 Site the tank at the furthest practical location from habitable dwellings. Most building regulations
recommend a minimum of 7m.
3.2.10 Consider drainage falls, generally 1 in 60/70 between house and tank and maximum 1 in 200 for soakaways
or other irrigation systems.
3.2.11 Lift the tank using ropes or slings through both of the shackles fitted either side of the neck.
3.2.12 DO NOT:-
3.2.13 Subject the tank to impact or contact with sharp edges.
3.2.14 Exceed an invert depth of:
i. 1.0m for 2,700 & 4,500L Tanks, Via brick work.
ii. 2.0m for 1800L Tank, Via brick work.
3.2.15 Install in trafficked areas without a suitable backfill design.
3.2.16 Site the tank so that it is subjected to excess ground pressure (e.g. sloping sites) or applied loads such as may
be generated by the proximity of vehicular traffic.
3.2.17 Lift using only one lifting point.
3.2.18 Fill an unsupported tank.
3.3 INSTALLATION – GENERAL
3.3.1 When units are installed in unstable ground conditions where movement of the surrounding material and/or
unit may occur, the connecting pipe work should be designed to minimise the risk of damage from differential
movement of the unit(s) and/or surrounding material.
3.3.2 For units with burial depths greater than 1000mm from cover level to the top of the unit, specific site
conditions should be taken into consideration and the backfill designed to bear any loads which may be
applied during and after installation to prevent the tank being subjected to these loads.
3.3.3 The excavation must be deep enough to provide bedding and cover depth as determined by the type of
surface pavement and loading. Asphalt and concrete pads should extend a minimum of 300mm
horizontally beyond the unit in all directions.
3.3.4 In situations where the excavation will not maintain a vertical wall, it will be necessary to shore up the side
walls of the excavation with suitable trench sheets and bracing systems to maintain a vertical wall from the
bottom to the top of the excavation. DO NOT completely remove the shoring system until the backfilling is
complete. These sites should be considered as wet sites.
3.3.5 In areas where the water table is above the bottom of the excavation and/or the excavation is liable to flood,
the excavation should be dewatered using suitable pumping equipment and this should continue until the
installation is complete.
3.3.6 During installation care must be taken to ensure that the body of any unit is uniformly supported so that point
loads through the unit are avoided.
3.3.7 The Concrete Specification is a general specification. It is not a site specific installation design.
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