For inspection purposes only. Consent of copyright owner required ...

2.4 INSTALLATION
2.4.1 General
A ‘competent person’, e.g. an appropriately qualified and
experienced engineer, shall conduct a site
characterisation/site assessment in accordance with the
EPA Wastewater treatment manual – Treatment
Systems for Single Houses 2000.
Based on this assessment, a ‘competent person’ should
design and supervise installation and commissioning of
the wastewater treatment system including all relevant
drainage pipe work and connections, vent pipes,
manholes, inspection chambers, distribution box,
polishing filter and fencing.
The ‘competent person’ should ensure that all aspects
of installation are in accordance with
• The current Building Regulations
• the conditions of planning e.g. unit loading remains
as per design, polishing filter properties and water
levels are as specified in the planning submission
and
• Cl. 2.4.6 and Part 3 of this Certificate, and that
ground conditions are adequate.
2.4.2 Certificate Holder’s Installation Policy
It is Carlow Precast Tanks’ policy to:
a) deliver, off load, and lift each unit into the
excavation provided, using appropriate lifting
equipment;
b) supply detailed installation instructions;
c) inspect the excavation for suitability etc prior to
installation
d) level the unit for connection to drainage pipe work;
e) commission the unit after installation;
f) carry out a first service (typically within 6 months of
start up) to ensure that the system is being used
and is operating correctly.
The reminder of the installation (including electrical) shall
be carried out by ‘competent persons’ in accordance
with the installation instructions provided (see Cl 2.4.3).
2.4.3 Electrical Works
Electrical connections shall be strictly in accordance with
the Certificate holder’s instructions, the current versions
of ET101 National Rules for Electrical Installations and
ET 207 Guide to the National Rules for Electrical
Installations As Applicable To Domestic & Similar
Installations, published by the Electro-Technical Council
of Ireland (ETCI).
All electrical works, and connections to the mains supply
board, shall be carried out by a ‘competent person’,
using materials suitable for the purpose (230v supply
protected by a 20A RCBO and fed with a 3 x 2.5mm 2
S.W.A cable). Cable should be of sufficient length to
reach from the dwelling to the furthest point on the tank.
Electrical cables shall be protected from accidental
damage e.g. by a suitable conduit or use of S.W.A cable.
2.4.4 Site Works
The excavation shall be of sufficient size to permit
placement of the unit and back filling and to allow for
timbering and sheeting. There should be sufficient area
on site to permit excavation, dumping of excess spoil,
backfilling, handling and installation, without causing
damage to the unit or the ancillary equipment.
Care shall be taken to prevent accidental damage
arising from blows from tools, or concentrated loads on
the unit during installation.
Certificate No. 08/0318 / CPT Zons® AQUAstar®
2.4.5 Health and Safety
Excavation, placing and backfilling should be carried out
strictly in accordance with the requirements of the
Safety, Health and Welfare at Work Act 2005 and all
other relevant legislative requirements.
2.4.6 Procedure
For inspection purposes only.
Consent of copyright owner required for any other use.
a) Equipment and materials
All plant and materials necessary for the installation
should be on site before excavation commences.
b) Tank Installation – dry site 4
The tanks shall be installed generally in accordance with
the certificate holder’s instructions and the following
particular requirements are noted:
1. Excavate a pit with battered sides; minimum
dimensions as follows:
2 – 6 PE unit: 3.6 m x 2.5 m x 2.0 m below incoming invert level
6 – 10 PE unit: 3.0 m x 3.0 m x 2.2 m below incoming invert
level.
2 The base of the excavation to be level and free from
projecting hard points eg rock or boulders. Voids and
soft spots to be removed. A level bed of approximately
200mm sand, gravel or broken stone is preferred. If
necessary e.g. in poor ground, a firm level concrete base
is to be provided. The concrete to be of suitable grade
(minimum 35N), and thickness, (minimum 150 mm).
3. The tank to be lowered onto excavation base, by
Carlow Precast Tanks, and checked for line and level. If
adjustments are required, the tank to be removed from
the excavation and placed in a safe position on level
ground. Adjustments to be carried out by the Customers
operatives. No work to be carried out beneath a
suspended tank.
When the tank is level, and in line with the incoming
drain and the distribution chamber, lifting devices to be
removed and backfilling can commence.
4. Care to be taken to prevent damage to external
flanges or pipe work. Access covers to be in place at all
times, and the unit to be ballasted, during backfilling.
5. Backfilling to commence as soon as possible after
placement, using selected self-compacting pea gravel or
suitable granular material, (compaction factor of 0.2 or
less, all rocks and large stones removed). Suitable
excavated material may be used ie compactable and
free from large stones and cobbles. Backfill in layers not
exceeding 600mm depth and lightly compact each layer,
taking care not to damage the tank. The backfilling
should be scheduled to permit connection of drainage
pipe work. The unit is designed for a maximum of
800mm overburden.
6 In the event of damage to any element of the chamber,
lid, manhole cover or connections, the certificate holder
should be contacted and an appropriate repair method
developed. In an extreme case, effective repair may be
impractical and Carlow Precast Tanks may direct that
the tank should be replaced.
4 A dry site is defined as one where the local water table never
rises above the base of the treatment unit.
EPA Export 24-08-2012:23:55:55