Septic tank installation manual - Tricel
Contents
1. conditions Fill each chamber of the unit with clean water to a depth of 300mm and recheck the pipe work levels Commence backfilling evenly around the tank ensuring that there are no voids Continue filling the chambers whilst backfilling ensure that the progressive water level is no more than 300mm above the backfill level Continue to backfill until material has reached 100mm over the tank Complete backfilling with topsoil Ensure lid remain above surrounding ground level 10 7 5 Deeper tank installation amp wet site installation A concrete surround is required where two or more risers are required or where the site conditions are considered wet A wet site is one where the water table may rise higher than the base of the Tricel unit 7 5 1Tank base plinth Remove any soft spots or large stones and boulders The base is constructed of a 200mm layer of concrete semi dry mix Ensure that base is level and ensure that correct orientations are determined to accommodate the incoming pipe work It is important to maintain a completely dry excavation until the final pour of concrete is set It may be necessary to line the excavation with a continuous layer of 1200gauge polythene to maintain the integrity of the concrete 7 5 2 Installing onto the base plinth Lift the unit carefully into the hole and place on the prepared plinth before the concrete sets The unit must be dead level on the plinth The higher pipe on the tanks is to b2. OEEEEEEE TEL REE ERE ZLLLLLLLLLLLLE PILEEELLEIL A SAOELEEEPEELEE SOCEEEEEEEEE COAEEAEAETEETE Pane GOOEEEEEPEEEEE AOPPEEEE PELE POCEPEPEPEEEES UOdTETT ETE VIILITTTITITTE IISI ZLLLLLLLLLLLLE p LEEEETEET EEA 7 ZILLLLLLLLLELE o LULLLLEELLA VOOLEEELEEELEE G oncrete S emi d ry mix PPEOLEEPLE EL ry ZLLLLLLLLLLELE zi AOCEPEEPEEE COOETTEETTE ET EE C onc rete Se mi d J MX ee PPPPLPEPPEL L COOLOEEEEEEEES AOCEEL EE EET LE ACPEEEEEE TT As dtttttttttt COOEFOEEEEEE ETE beeeeeerereres S6bCee tet tts VOOOEEEEEEEEEE eeeeeereeeeees 200 200 7 4 Dry site installation 7 4 1 Tank base plinth L Remove any soft spots or large stones and boulders O The base is constructed of a 200mm layer of concrete semi dry mix O Ensure that base is level and ensure that correct orientations are determined to accommodate the incoming pipe work 7 4 2 Installing onto the base plinth L Lift the unit carefully into the hole and place on the prepared plinth O The unit must sit dead level on the plinth O The higher pipe on the tanks is to be connected to your upstream inlet pipe work and the lower pipe on the tank is to be connected to you downstream outlet pipe work Connect and seal the pipe work to the tank checking alignment to ensure there is an adequate fall for each pipe O Mount manhole risers if used 7 4 3 Backfilling dry site Concrete Refer to backfill specification appropriate for site
3. TRICEL TRICEL Table of contents 1 Health amp safety precaution So sciccicsiecsccssencssssestssscicssessastagcacs sede sbetanecstesses anatszinds cbsctnsenendsosacucecuceeanesceaesnaeit 2 2 Transportation offloading and Storage oo eesssceceeseeeeeeeteteteseeeeeseseeceeesenseacaratarararsnesaceeeeeeeeneees 2 3 The wastewater purification process csssseceseseseseseseeeeeeeececacarscaeseseseececaearseseeeeeeeeeeeseneeatararaneeess 3 As TarbeGimensS ions siciiccessicssedessceseesselencitueteseceseasaestanssdbientaretshsostea teeta cdivepanueudecalooabapedecyepistusseasededs cpotacasecdcaes 4 5 Tank Grawin giiiecccicnsiaedaniien nitude deans iiataelaibiauiin bhadlaieeieatuldea usta n intakes 4 6 Manhole risers deep inverts ccccecccecssesecsesesesesesececscsesesesscecscsesesssacecacaesesaeaeaearsesnssesesaesesneeseeetans 5 Tae MIASCALLBCIO AE E A E dint ssaiaearhanes delete dubai EEEE 5 7 1 Pre installation INSPECHOM Ss dcccscasciseccasccsoconsacecdncdesousacastcutspecon eatacatocsbcusnaccassssshasiacechedhoeemnucatuedss 5 7 2 Quick installation QUIGCLINGS oe eee eeeecs eee eeeeeseseeeeeeacecsaesesesenaeseseeeeaeseseeeeasaeseeeeataeeeesaeseeatseseeetataesees 6 7 3 Detailed installation information 0 0 eseseseeeeeeeeseceeeseseseseseeeeeeeesasacaraeaeaeseseacacacaeseseseseeeeeeeseeatatarararees 7 7 4 Dry site installation sessisccetcestsrsssccectcsesinsccncvecatevesctavasicivescoetececeutorecsdedacstieavs
4. ay De sludge period minimum Nominal inlet outlet pipe diameter Inlet invert to base Inlet invert to ground level tank only Inlet invert to ground level with 1 riser Outlet invert to ground Level Tank capacity Overall length Overall width Overall height 5 Tank drawings D7 RhA A d aS ga mm gt i Sal SC Ee H N FIONN HEW EN I aty i Hes OLLA Pn wm a a TT Hes E2 d ome i Oty ICa HIM AN N Ut IL ee 6 Manhole risers deep inverts Manhole risers are available for deeper installation requirements They are available in 180mm increments x 400mm diameter to a maximum height of 900mm 960mm from the invert level of the outlet pipe to ground level 180mm manhole risers require a standard installation for dry sites 360mm amp 540mm manhole risers require a complete concrete backfill See notes on deeper tank installation and wet site installation Never install the cover of the system under ground level Never let groundwater enter the system 7 Only Tricel risers should be used j All manholes lids are lockable and should be locked for safety and to prevent unauthorised access All maintenance work is done through these manholes Systems with a manhole riser of 360mm or 540mm must have a concrete surround 360mm and 540mm risers cannot be retrofitted unless the correct base and backfill requirements are adhered to 7 Installation 7 1 Pre ins
5. c To prevent movement tanks may need to be tied down 3 Tanks are best lifted by crane or suitable lifting equipment and webbing lifting straps do not use chains or wire ropes in contact with the tank Ensure tank is empty when lifting 4 Move tanks only by lifting and setting do not drag or roll Do not drop or roll tanks from truck trailor 3 The wastewater purification process The septic tank is another product within the range of Tricel environmental solutions The Tricel septic tank is an ideal solution for wastewater treatment where sufficient land is available for an adequate drainage field The tank is divided into two chambers sized sufficiently to hold wastewater for an adequate amount of time for the solids to drop to the bottom to form a sludge and the lighter material to rise to the top of the liquid to form a scum A certain amount of anaerobic breakdown occurs within the tank The remaining liquid effluent is passed through the outlet pipe into the drainage system for final treatment The liquid is dispersed evenly within a series of drainage pipes into the soil The micro organisms in the soil breakdown any organic matter left in the effluent As most of the treatment is carried out in the percolation area it is important that the land is adequate for sufficient treatment of wastewater to prevent harm to the environment 4 Tank dimensions litre mo 110 Height above ground level Design flow rate litres d
6. e connected to your upstream inlet pipe work and the lower pipe on the tank is to be connected to you downstream outlet pipe work Connect and seal the pipe work to the tank checking alignment to ensure there is an adequate fall for each pipe Mount and seal manhole extensions if used 7 5 3 Backfilling a wet site Refer to backfill specification appropriate for site conditions e Fill each chamber of the unit with clean water to a depth of 300mm and recheck the pipe work levels Commence backfilling evenly around the tank ensuring that there are no voids Continue filling the chambers whilst backfilling ensure that the progressive water level is no more than 300mm above the backfill level e Backfill with concrete semi dry mix until it has reached 100mm over the tank e Complete backfilling with topsoil Ensure lid remain above surrounding ground level 11 7 6 Plinth and backfill specifications 7 6 1 Concrete backfill specification Semi dry concrete 25n grade with a ratio of 4 5 aggregate to 1 cement Note Standard concrete mixes should not be used where sulphates or similar aggressive chemicals are present in the groundwater Lift height rate of rise Determine the lift height m or rate of rise m h for the specific concrete type used to ensure that a design pressure P max of 15kN m2 on the tank is not exceeded Vibration The design of the tank assumes minimal compaction of the surrounding concrete Where
7. ed as much as possible from around the tanks using piped drains 7 3 3 Note water logged sites The Tricel System is not suitable to be used in water logged sites where the ground water may rise above the outlet level Please contact the supplier of the system if there are difficulties on site due to adverse water logging Adequate drainage is important to improve wet sites or sites with a high water table level It is critical that water is removed from the area surrounding the system to prevent flotation Excessive loading caused by site water can harm the system please consult with the manufacturer or a qualified engineer if in doubt 7 3 4 Excavation size Suitably sized equipment will be required to excavate the hole and to crane the system into place Installation depends on on site conditions water slopes location etc Excavation should be planned with due regard to Health and Safety requirements and should be either shored or battered back to a safe angle The excavation should allow a minimum 200mm clearance between the tank and the excavation wall or face of shoring Unstable ground with excessive sand peat swamps etc may require larger excavations The excavation should be maintained dry by pumping or whatever suitable means External dimensions Dia in meters x Length in meters Total excavation Width 200mm x Length 200mm Excavation depth Allow 200mm for a tank base plinth 7 3 5 Excavation depth T
8. er the tank for sampling and to assist in clearing possible blockages If sewage consists of high quantities of grease e g from a restaurant a grease trap may have to be installed on a separate drain prior to the system Note The option of anchor straps may also be used on wet site This should be designed by an on site structural engineer 7 3 Detailed installation information 7 3 1 Siting The minimum distances for installing the septic tank are outlined below UK A dwelling 10 metres Wall or boundary 5 metres Well borehole or spring 50 metres Watercourse 10 metres The soak away should be 5m from a hedge or tree roots Ireland Tank and percolation area A dwelling 7 metres Site boundary 3 metres Road 4 metres Well borehole watercourse 10 metres or spring Lake 50 metres 7 3 2 Control of groundwater Tanks must not be subjected to buoyant forces during installation taking account of ground water levels and surface water run off and their accumulation in the tank pit even if tanks are anchored The excavation area should be adequately drained to permanently remove ground water from the proximity of the tank or tanks This is critical in order to avoid flotation of the tanks Incorrectly installed tanks that are subject to movement rotation or floatation may become damaged for which we cannot accept liability Water should be remov
9. he excavation depth is determined by the inlet and outlet pipe invert levels relative to the bottom of the tank and allowing for the minimum base thickness shown Dimension details of the tank are shown on the relevant drawing supplied with the system Ground instability at formation level e g running sand may necessitate over excavation and stabilisation with hardcore or blinding concrete NOTE Check that the depth to the base slab is within the Service Specification requirements for the tank Dry Site Wet Site Ground Level zzz PILELELLLLI Ls VOCOEEEEEEEEET AtOEEEEEEETE VOCOEELELEEEEE CAEAAAKALAL VOCLEEEEEEEE EE POLEELPEEL EL PAPEETE TE Le WAtttttAA ATLL DIII CPEEEEEE EEL COCLEEEEEEEE EE LEOEETEETEL GOEEET EEE Le VOOCEEEEEEE EEE COEEEtEET ET Ground Level COECEEEEEEL LEE ke COOPPEEPPE SA SOECPEPEEEEE EEE Pu ie COOPPEEPE EEA COEPEEPEEE EEE T RACE COLEES Lda ditide VOCEEEEEEEEELE COEEEEEEEET SENTETTT EEE E i VPECCLEEEE TA VIPEEEEEEEEEEE cette ett t tt COLITPTEESSETE VLEPPLELEL TAs COOEEEEEEEE EEE VACEEEEEE EE Le COOELEEEEETTEE CELEEEEEEE Te COOLED EEEET EE LEOELEEEL EL COEEETEEEEEEEE COEEEETTTE Ls COOEEEEEEET EEE CEOELLEEE EL 2 COOOLEEEEEETEE ORRERA ZILILILPLPLLLE APPELLEE EL COOEEEEEEEEEEE WAPEEEEEEEE Lo VAAN ALE VACEEE EEE EE COOELEEEEETTEE GEEEEEEEE Le COOEEEEEEEEEEE LOOEEEEEE EL Sean th ak Sel s ss Sh G COOEEETEEEEETE CEEEEEEE ELS COOOLEEELEEEEE COOTEEET EEE A VOCEEEEEEEEEEE S
10. ied to EN 12566 1 page 5 for manhole riser details TTM T202 RevO2 12 Mar 14 1 Health and safety precautions As safety and security are of vital importance in septic tank installation the following aspects are critical e Ensure that all the information contained in this manual is adhered to at all times e When working with machinery electrical equipment proximity of water shall be noted e There is potential danger when de sludging and therefore this shall never be done alone e Never enter a tank unless qualified to do so e Naked flames shall not be used in the vicinity of the tank due to the danger of combustion e The manhole cover shall never be left off an unattended tank e Protective clothing gloves shall be worn at all times Always remove contaminated clothing and protective equipment after working with septic tank e Wash hands and face prior to eating drinking or smoking e A second person shall be present when carrying out maintenance e A sampling box shall be constructed to facilitate sampling and inspection without placing personnel at risk e Great care shall be taken when handling sludge e Always lock the cover of the system when maintenance is completed 1 Tanks must be held down during transportation using nylon straps do not use cables or chains to secure tanks Do not over tighten straps to cause deformation of the tank shell 2 Always set the tank s on flat smooth ground free from debris et
11. les should be worn at all times Always remove contaminated clothing and protective equipment after completion of work Wash hands and face prior to eating drinking or smoking A certain amount of system maintenance is required on an ongoing basis to ensure that the system is working correctly This is the responsibility of the homeowner 10 1 Quarterly Maintenance 3 months The outlet distribution box should be checked monthly to ensure that the effluent is free flowing and clear The vent should be checked to make sure they are not blocked or covered with over grown grass 10 2 Yearly maintenance De sludging should be also carried out yearly to prevent solids rising to the height of the outlet pipe and being carried along with the liquid into the percolation trenches This blocks the percolation area and can cause flooding Depending on usage and house population more frequent de sludging may be required The de sludging of the septic tank is the responsibility of the homeowner De sludging is done with a vacuum tanker we recommend the use of a licensed company 10 2 1 De sludging emptying the solid waste from chamber 1 primary chamber e Remove the access cover e Empty the Tricel septic tank using a vacuum tanker Care must be taken not to damage the tank with the hose of the vacuum tanker e Replace the de sludging access cover securely Notes e Do not let this equipment drive over the tank Maintain a dista
12. nce of at least 4 meters away from the covers of the tank e The access cover should never be left off while the unit is unattended e De sludging should never be carried out alone The property owner has a legal responsibility to ensure that the system does not cause pollution a health hazard or nuisance 16 11 Operating conditions e The manufacturer s instructions outlined in the technical manuals must be followed at all times e It is important that the unit is operated under the conditions for which it is designed Any variation in these conditions could lead to the unit not performing to its full potential e De sludging is a critical part of the successful operation of the Tricel Septic tank Only competent approved personnel should carry out de sludging e The discharge to the ground is also a critical part of the operation of the system Correctly constructed distribution chambers and distribution drains or polishing filters are necessary as part of the treatment process Incorrectly constructed drains or polishing filters could result in poor treatment of effluent and we do not accept any responsibility in this regard e If the system is not installed correctly flooding overloading or floatation may occur We are not responsible for incorrectly installed systems e Soak ways drains and the emptying of primary tanks remain the responsibility of the client and damage to the installation due to the influx of surface water o
13. nches are set out in a continuous loop from the Distribution box An access chamber should be placed before and after the septic tank for sampling and inspection purposes and also to assist in any blockages that may occur Distribution box 450mm high x 300mm opening Riser extension 300mm opening x 270mm high 14 8 3 Sampling chamber A chamber must be fitted after every unit to allow easy access for sampling purposes The inlet of the chamber must be 150mm up from the base of the chamber to facilitate sampling cup Ye Inlet Outlet 9 Finishing the garden to ground level The finished ground level should be to the level indicated on the system 9 1 Ventilation Ventilation is crucial to the system Prior to installing the system great care must be given on how to provide adequate ventilation As sites differ advice is available from BS8301 BS6297 EPA wastewater Treatment Manuals 1999 and the manufacturer The Tricel Septic tank is supplied with 1No 110mm socket next to the inlet pipe for venting 15 10 Maintenance Precaution Any maintenance carried out inside the tank represents a confined space Therefore the maintenance person must be suitably trained to work in confined spaces Sewage and sewage effluent can carry micro organisms and gases harmful to human health Any person carrying out maintenance on the system must be appropriately trained Suitable protective clothing including gloves gogg
14. necessary this may be extended to include light internal vibration Never use deep revibration which will substantially increase the pressure on the tank possibly causing failure Impact of concrete on discharge Under no circumstances should concrete be discharged directly onto the tank 7 6 2 Gravel backfill specification Primary backfill specification Primary Backfill material should be free flowing granular material Compaction should be by lightweight rollers or vibratory plate compactor until traffic depth has been achieved Compact evenly around the turret extensions to reduce risk of distortion Tanks must be installed with Primary Backfill only within the region immediately surrounding the tanks This Primary Backfill must extend a minimum of 250mm outward from the tank and directly beneath the tank The following materials are approved as Primary Backfill Rounded pea gravel Minimum particle size 3mm maximum 18 mm compacted to a relative density of gt 70 Gravel shall be clean and free flowing free from large rocks dirt sand roots organic materials or debris Upon screening analysis the backfill material shall have no more than 5 by weight passing 2 36 mm Sieve Or 12 Crushed or processed stone Minimum particle size 3 mm maximum 12 mm compacted to a relative density of gt 40 Dry Gravel density must be at least 1500 kg m3 Material should be washed or screened to remove fine particles Upon
15. of extra houses bedrooms in the houses schools cr che etc or by any other means we are not responsible for the system in terms of overloading or the quality of the effluent as the retention times may be compromised e The unit is not suitable for vehicular traffic We also recommend fencing off the area to prevent livestock herds from accessing the unit Where possible unnecessary human traffic around the tank should be avoided Terms amp conditions Subject to our standard terms and conditions which are available on request In accordance with our normal policy of product development this specification is subject to change without notice March 14 18 TRICEL GENERATIONS OF INNOVATION Tricel Killarney Ballyspillane Ind Est Killarney Co Kerry Ireland Tel 353 0 64 6632421 Email sales ie tricel eu www ie tricel eu Tricel Gloucester Ltd Fox House Stonedale Road Stonehouse Gloucestershire GL10 3SA United Kingdom Tel 44 0 1453 791 616 Email sales uk tricel eu www uk tricel eu In accordance with Tricel normal policy of product development these specifications are subject to change without notice
16. r anchor straps if required should be built into the foundation A base is then formed using 200mm of concrete semi dry mix suitable to site conditions and this must be flat and level A base is constructed of a 200mm layer of concrete semi dry mix to suit site conditions This must be flat and level Ensure gravel concrete are clean and contains no large materials Lift tank into position and align as required for connecting pipe work access shafts etc Ensure that each tank is 100 Level and that inlet outlets are in the correct orientations Secure anchor straps if required Ballast the tank with water Mount risers Commence gravel backfilling in 300mm layers to 100mm over the tank ensuring tank and any pipe work is properly supported Commence concrete backfilling in 300mm layers to 100mm over the tank ensuring tank and any pipe work is properly supported Complete backfilling with topsoil up to ground level Ensure that surrounding finished ground level is never higher than the cover of the Compaction should be by lightweight rollers or vibratory plate compactor until traffic depth has been achieved Compact evenly around the riser extensions to reduce risk of distortion Ensure that No surface loadings are transferred from the cover direct to the tank Cover frame construction should allow movement An access chamber should be installed before and aft
17. r the backing up of soak ways or drains is not covered by the manufacturer e We shall not be liable for any damage or loss including consequential loss caused by the failure of any plumbing equipment or failure caused by the inclusion of gross solids e g disposable diapers or sanitary towels etc in the septic tank e To ensure the continuance of the systems performance the user has to take certain precautions including the following e The design loading of the plant should not be exceeded e High volume discharges such as those from swimming pools and Jacuzzi s must never enter the system e Surface water must not enter the system e Do not allow large quantities of chemicals to enter the system including o Water softener regenerate o Disinfectants o Strong acids and alkalis or photographic chemicals o Oil or grease o Petrol or diesel o Pesticides o Large quantities of milk alcohol or food o Large quantities of bleaches or cleaners o Baby wipes o Sanitary towels 17 o Kitchen paper o Nappies e Service personnel must be accommodated with clear access to the system e If the system has been sized by others we will supply a system to these specification and not its own specifications In this case the responsibility lies with others in relation to the maximum flow litres per day the system capacity and retention times e If we size the system and a greater load is placed on the system by the addition
18. rdance with this manual should connect the plumbing from the dwelling to the septic tank The septic tank is plumbed for 110mm uPVC pipe The pipe should be vented by means of a vent pipe above the eaves of the house A short length of pipe with flexible joints should be used immediately before and after the tank to allow for movement between the tank and the pipe work Note water logged sites The TricelUSeptic tank is not suitable to be used in a water logged site Please contact the supplier of the system if there are difficulties on site due to adverse water logging Adequate drainage is important to improve wet sites or sites with a high water table level It is critical that water is removed from the area 8 1 Treatment of effluent liquid The septic tank acts as a holding chamber and treatment of effluent is carried out in the percolation area Effluent may be disposed into any of any of the following means for treatment e Drainage field UK e Drainage mound UK e Percolation area Ire The best disposal method can depend on a variety of site factors including percolation results soil type water table level and topography of the site Please refer to the onsite engineer for further details 8 2 Distribution box A distribution box and inspection chamber should be fitted between the tank and the percolation area A Distribution Box should be used to correctly construct the percolation trenches The percolation tre
19. screening analysis the backfill material shall have no more than 5 by weight passing 2 36 mm Sieve Use of other than specified backfill and bedding materials will void the tank warranty Backfill material shall not be frozen or contain lumps of frozen material at any time during placement 7 6 3 Top soil Clean native top soil shall not contain rocks larger than 36mm on largest dimension Note The use of geo textile barrier fabrics surrounding the primary backfill material is considered good installation practice The fabric must be chosen to allow the flow of water in and out of the excavation but to prevent the movement of fine soil particles into the primary backfill material 7 6 4 Burial depth Generally the max depth from finished to the inlet invert level of the main shell should be no more than 725mm This may vary dependent upon ground water conditions 7 6 5 Loadings If the tank is installed in an area where traffic or other superimposed loadings can be applied consult a structural engineer for the design of a reinforced concrete slab to prevent the load being transmitted to the tank or its concrete surround If this slab is constructed immediately above the tank it should be separated from the concrete surrounding the tank by a compressible material 13 8 Plumbing the system Do not Plumb storm water water from roofs drains footpaths etc into the Tricel septic tank A competent person in acco
20. seehducciesVonsnenstauearersnedaareraats 10 7 5 Deeper tank installation amp wet site installation ee eseeeseeeeeeeeeseseseerseseeceserarseerreeeeteeeeeseeeeees 11 7 6 Plinth and backfill specifications 00 eee eee ee eeeeeeeeeseseaeersescecacacececaeseseseseseesenensseseseetsneentesnteateateases 12 8 Plumbing the Systeme sccsiccccc ssscscdin cies cssssaccnte che costecasaestnegs droienn srana Wepecarcnecssardutasseacslsbasastuesscacndvandsacctveadans 14 9 Finishing the garden to ground level cence neeeeneneceeeeesenene neces eens nenecennenenenenenenneneneee 15 10 Mantena NCE isicccices cosets ccsucndeclescebinndesshensossessasabeielbbucaiiudids uuteetiasatstsioosbabbede isansa sana aasian taie iiei dessai aione 16 11 Operating CONGItIONS 20 cece esseeseeseeesescecscseseseseseseseeeessnscacacacscecesasasacacacasacasacasacasaesesseeseeteeesetees 17 It is important to read the full technical and installation guide prior to installation This document should be retained for the lifetime of the product and in the event of change of ownership be transferred to the new owner Precaution Prior to installation please consider finished garden level when installing the system If you envisage that a manhole riser extension may be required to ensure manhole lid remains above finished ground level the system must be installed with the appropriate excavation foundation and backfill to accommodate the riser Please refer to CE Certif
21. tallation inspection e Tanks should be subject to visual inspection prior to installation e Check for fractures to the shell or ribs de laminations scratches or abrasions deeper than 1 5mm e Any damage should be notified to the delivery driver and or to your supplier e Donot attempt to carry out any un authorised repairs as this will invalidate the warranty on the tank e Once the tank has been installed we cannot accept any claims for damage 7 2 Quick installation guidelines A dry site is one where the water table never rises higher than the base of the Tricel unit A wet Site is one where the water table may rise higher than the base of the Tricel unit The unit should never be installed where ground water can rise higher than the outlet pipe All installations must be Fit for purpose to suit the on site conditions which will vary from site to site This is the responsibility of the onsite contractor Never roll the tanks Tanks shall be lifted into position The unit should be located as far away from the dwelling as is practically possible considering topography and pipe work levels Separation distances must meet all National and Local regulations Dig a hole circa 400mm larger than the system in plan Remove any soft spots or boulders of significant size from the base or sides of the excavation Ground water must be pumped to give a dry excavation and excavation lined with polythene Provisions fo
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