Fig 2: CPT Zons® AQUAstar® System: 6 - 10 PE Unit; Section and Plan <strong>For</strong> <strong>inspection</strong> <strong>purposes</strong> <strong>only</strong>. <strong>Consent</strong> <strong>of</strong> <strong>copyright</strong> <strong>owner</strong> <strong>required</strong> for any other use. Certificate No. 08/0318 / CPT Zons® AQUAstar® EPA Export 24-08-2012:23:55:55
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 <strong>of</strong> the wastewater treatment system including all relevant drainage pipe work and connections, vent pipes, manholes, <strong>inspection</strong> chambers, distribution box, polishing filter and fencing. The ‘competent person’ should ensure that all aspects <strong>of</strong> installation are in accordance with • The current Building Regulations • the conditions <strong>of</strong> 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 <strong>of</strong> 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, <strong>of</strong>f 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 <strong>of</strong> start up) to ensure that the system is being used and is operating correctly. The reminder <strong>of</strong> 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 <strong>of</strong> 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 <strong>of</strong> 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 <strong>of</strong> 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 <strong>of</strong> S.W.A cable. 2.4.4 Site Works The excavation shall be <strong>of</strong> sufficient size to permit placement <strong>of</strong> the unit and back filling and to allow for timbering and sheeting. There should be sufficient area on site to permit excavation, dumping <strong>of</strong> 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 <strong>of</strong> the Safety, Health and Welfare at Work Act 2005 and all other relevant legislative requirements. 2.4.6 Procedure <strong>For</strong> <strong>inspection</strong> <strong>purposes</strong> <strong>only</strong>. <strong>Consent</strong> <strong>of</strong> <strong>copyright</strong> <strong>owner</strong> <strong>required</strong> 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 <strong>of</strong> the excavation to be level and free from projecting hard points eg rock or boulders. Voids and s<strong>of</strong>t spots to be removed. A level bed <strong>of</strong> 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 <strong>of</strong> 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 <strong>required</strong>, 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 <strong>of</strong> 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 <strong>of</strong> drainage pipe work. The unit is designed for a maximum <strong>of</strong> 800mm overburden. 6 In the event <strong>of</strong> damage to any element <strong>of</strong> 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 <strong>of</strong> the treatment unit. EPA Export 24-08-2012:23:55:55
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