Depth = 1000 to 1300mm (min below water level) + free board = 300 to 450mm. c Brick Ballast Soakage Pit Cft 144. 2. The septic tank was invented in the 1860's and is the original piece of sewage equipment used for the treatment of sewage in rural areas. Wastewater flows into the tank at one end and leaves it at. chickenandsmall duckfarms), willnot. Volume for sludge Depth of Tank 2m. Again the sampling was purposive to ensure that septic tanks with soakaway pit are included but at the same time ensuring uniform spatial distribution of the tanks (Map 2 and 3). 8m (I. Re: Septic Soak-away Tanks Vs Biodigesters: Make Your Choice by msbmnigeria: 12:54pm On Aug 16, 2021. 39K views Streamed 4 years ago Septic Tank TV. 1: Pit sizing calculation tool (Excel document) 4 Septic tank design procedure 4. A geotextile membrane (mesh) to stop soil from blocking the void. The waste water from the bathroom, kitchen etc. LAST UPDATED: 9th January 2023 by The Editorial Team. ) So: V stor = 0. Damage to the septic tank itself - internal damage to parts of the septic. This should govern the planning of your system and will inform whether a septic tank will be suitable for your property. 634–641. 5m deep in a lower part of your garden and preferably at the bottom of a slope. Design Criteria for seepage pits used to dispose of septic effluent. The next step is to set up the floor of the septic tank. Sludge digested 237. septic tank, twin-pits for pour-flush toilets, biogas settler, anaerobic baffled reactor, etc. Building Property Boundary Wells, Springs or any water source Potable Water Pipes *Cuts or Embankments Paths Swimming Pools Shore line/high-water mark Underground Water Storage Tank Large Trees Septic Tank Soakaway Note + Ground Water Level Notes: * These distances should be increased to 60 metres, if the installation is on a water supply. The discharge to the watercourse stopped and diverted to a drainfield, designed and constructed to the current British Standard 6297:2007. Casted Septic Tank project under construction. The recommended size of a septic tank is a function of the volume of wastewater it receives. The septic tank design is such that it maintains the sewage in the tank for 24. The insides of the excavation can become smeared, particularly by mechanical diggers building a soakaway in clay soils. If it is, then it means that the groundwater underneath your soakaway is abstracted via a borehole somewhere and used for drinking water You will not be allowed to pollute it with sewage effluent bacteria. System layout 33 11. It is also referred to as a soak way or leach pit or seepage pit. 4 Construction, Operation and Maintenance of Septic Tanks A septic tank is a large underground, watertight container, although the size of the tank is legally determined by the number of bedrooms in the house, it is about 2. A Looped Soakaway System. If building one’s own tank from brick the walls should be at least 230mm thick, and. The base should be constructed flat to a tolerance of 10mm in 3m. If the base is constructed on a gradient the water will naturally collect at the low points. to soakaway pits outlet to soakaway pits section a-a manhole 600x500mm with c. Percolation test procedure for surface water soakaways. Tunnel system 37 13. Soakaway pits/trenches are however necessary. alternatives, inspection methods Defects in onsite waste disposal systems, septic tank problems, septic drainfield problems, checklists of system components and things to ask. Ensure access for emptying of septic tank, as well as availability of sludge treatment and disposal. The trenches for the soakaway should be between 300mm and 900mm wide with a distance of 2m between trenches. soak pit - Download as a PDF or view online for free. Jun 15, 2019 - Building A Soakaway For A Septic TankThere are many ways to constructing and building a soakaway for a septic tank. Farms which can achieve very high levels of dry removal ofsolidwaste,andlowlevelsofwateruse(ie. In this chapter, therefore, levels of service lower than this will not be discussed. Thanks. This is the case for domestic driveway or garden soakaways and larger commercial systems. #soakpit #septictank#soakpitconstruction#wastewaterconstruction#wastewatertreatment#soakpitconstructionforhouse#soakwell #cementringseptictank#soakwellconstr. 0 below the invert level of the inlet pipe. 07 m3 Head. . how to construct a soakaway pitdo you construct a soakaway pit?What digger do you need?How easy is it to. For example, you could dig a soakaway pit. 8m wide, 1. The clear diagrams and details provided facilitate a better understanding of the components and layout, aiding professionals and enthusiasts alike in implementing effective waste. This is also a requirement for a loan backed by the Federal Housing Authority, or FHA, though exceptions can be. Report. 8m deep) Excavated Dimensions For Septic Tank = 3m x 3m x 3. 71. 2. Soakaway pits, also known as dry wells, are underground systems used to allow rainfall to infiltrate into the ground. Day 5: Block work starts. 2. System layout 32 9. The sewage runs through a pipe directly into a lake, river or stream. Total Septic Tank Capacity = 2000+300 = 2300 Liters. A stone-filled dry well is the simplest of all seepage pits. Under-sizing your septic tank will result in the water produced being high in suspended solids and risks blocking your soakaway. Soak Pit – Need and Functions. Normally the soak pit and borewell should not be too near. Maintenance and Management of Soakaway Systems 6. Our tanks are built to last. The soak pit may be of any suitable shape preferably circular. Hello, guys in this article we will discuss the design of the septic tank and soak pit. Soakaways are designed to cope with a certain volume of daily wastewater used. at a level above that of the water table. 5m from any boundary. Re: Septic Soak-away Tanks Vs Biodigesters: Make Your Choice by msbmnigeria: 12:54pm On Aug 16, 2021. The walls of the tank can be made of poured, reinforced concrete, stone masonry, brick or concrete blocks. 3. SEPTIC TANK -PROVISIONAL B. 1: Septic tank calculation tool (Excel document) 5 Footrest and drophole design 6 Checklist for concrete quality 7 Design summary for VIP latrines and UDDT toilets 8 Design considerations for difficult conditions4. I had assumed it was raw sewage after reading about it needing to be so deep for the required purification to occur before human contact. A rectangular grid allows alternative pathways. Gender Elderly and Children. 50 Soakaway 1. If your kitchen sink is fitted with an automatic waste grinder these volumes should be increased by 30%. The main factors involved in pricing the emptying of a septic tank are: The size The size of the septic tank will determine how many trips will be. 5m from a subsurface wastewater absorption unit. In this illustration the seepage pit is being used to dispose of septic effluent from a septic tank. Manhole to be water tight on completion and be tested for water tightness a. A "Cesspool" is a large holding tank that is completely sealed having only an inlet and a vented air outlet. The opening of a soakaway screen should never be too small as it may prevent the wastewater from moving through. 13: Not Used : WSD 7. • 29 likes • 20,173 views. Farms which can achieve very high levels of dry removal. A standard septic tank in Nigeria is 8 by 10. 90 m and a minimum depth of 1. g. They only hold 12 months sludge storage and if sludge starts to empty into the drainage field soil, it very quickly blocks the air spaces (porosity) in the soil, the effluent cannot soak away, you suffer a. Wastewater collected from canteen kitchens. 8m (I. 25 Where: The tank which Stores a waste water of House or building is called Septic Tank. With the aid of a drilling machine, a hole of about 75mm is drilled at the side of the topmost rim above ground level to accommodate a pipe that will convey waste water that rises to that level into a chamber just beside the pit. Impermeable soils require that stand alone. As an aid, mark a stick 300mm from one end, place in the hole and fill up to the mark. 0m from any building sewer or septic tank and 7. ii) Detention period: In the process of designing the septic tank, the detention period should have been 24 hours. SEPTIC TANK AND SOAK AWAY PIT A. A soak pit is a covered, porous-walled chamber that allows water to slowly soak into the ground and is also known as a soakaway or leach pit, and the pre-settled sewage from the septic tank is released to the underground chamber from where it infiltrates into the neighbouring soils. Venue - Oke-Owa Area of Ijebu Ode, Ogun state, Nigeria. Soakaways can be an ideal drainage solution to deal with rainfall that doesn't naturally drain from your property. The owner must provide a 150 mm by-pass pipe from the last manhole before the septic tank and extended to the outside drain line of theA lack of regular septic tank emptying. All septic tanks require emptying ONCE A YEAR. Natural. Soakaway Pit Design. Can Be Used in Remote Areas. THE CHOICE AND CONSTRUCTION OF SOAKAWAYS 2 2. Septic tank design // soak pit design. So we are briefly describing soak pit design and providing structural design for soakwell in AutoCAD. Government Area of Osun State,. septic tank and soakaway, a household connection is needed. Step 1- Excavated earth inverted level from natural ground level Upto 3800 mm. g. How to build a soakaway for a septic tank. Soakaways are intended to handle a specific volume of wastewater generated on a daily basis. In the construction of soakaways, proper precautions shall be taken to prevent the side walls from collapsing while workmen are in the hole. Viewer. 1 of 15. It serves the function of letting the wastewater coming from the septic tank to slowly soak into the underlying ground. Download dwg PREMIUM . Normally soakaway pit are used as disposal units but in areas with high water table they are not the best option because perforated pit would allow entrance of subsurface water. Sokoine Building, P. While digging was ongoing, materials were already on site. It helps manage and disperse the effluent (wastewater. An aqua-privy is like a single-chamber septic tank, except the toilet is located directly over the. However, if you’re building a four-room bungalow for a modest family, you’ll need a regular septic tank that’s 8 by 10 and a soakaway that’s 4 by 4. This is really important in ensuring that your soakaway works as it should - because if the septic tank or sewage treatment plant isn't emptied regularly, solid waste will eventually work its way into the soakaway and block it up. My property and the septic tank along with the. Minimum capacity = 1 cubic meter (10 cubic feet). Some of the of the major materials for constructing Soakaway tanks and their prices includes. Soak Pit is a closed absorptive chamber that lets water drain into the ground surface slowly. of users All wastes TABLE 2 SOAKAGE PIT SIZES TYPE B 5 85 75 All wastes No. Soak pit is usually built with locally available materials, but the septic tank is constructed using bricks and cement, and even a concrete floor bed is laid. 11B: Soakaway Pit - General Arrangement: 3: 123KB: WSD 7. The soakaway system and the surrounding soil should be able to soak away the same volume in one day. There are all details about the Septic Tank, Plan, Cros Section, Foundation, levels, manhole covers etc, So We hope this Septic Tank details also will be useful for you. Fill with water to depth of 300mm. The. A standard septic tank in Nigeria is 8 by 10. Swimming pools should not be located less than 3. . 3 = 2. Septic Tank is deeper than Soakaway, unlike Soakaway, the body plastered and the floor, floored. AssoJnr:. The soak pit may be filled with stone aggregates or may be kept empty. Ecoflo finds a better way. Pedro gonzalez ramirez. 5. 4. I recently call a family friend of mine that has been helping me on my. Well setbacks & clearances to septics, property lines, buildings, etc. A STS consists of a septic tank, a soakaway pit or some soakaway trenches, and the surrounding soil into which wastewater is finally disposed. 2) m3 is suitable for a family with 4-5 members, which has the capacity to carry 300 per lit discharge in the day. Once you know how much waste comes from your home, you can begin to arrange tanks together to construct the biodigester septic tank. by Aventures ( m ): 4:34pm On Jul 09, 2012. 2. A STS consists of a septic tank, a soakaway pit or some soakaway trenches, and the surrounding soil into which wastewater is finally disposed. Septic tanks cannot discharge to surface. 8m 3. Pre-settled effluent from a collection and storage/treatment or (semi-) centralized treatment technology is discharged to the underground chamber from which it infiltrates into the surrounding soil. This will allow enough space for the ring to be installed and the additional volume of the annulus can be added to the overall. This Standard gives design guidance on how soakaways shall be incorporated into systems used to treat and store road runoff prior to discharging to ground. 2 It should be located no closer than 30 m from a water source. : A soak pit which is also called a soakaway is a closed porous wall chamber that is primary design to allows water to slowly. An 800 Litre Soakaway will cost between £1,000 and £1,100, while a 950 Litre Soakaway will cost between £1,100 and £1,200. l f. The solids being heavier than the waste liquids, settles down at the bottom of the. what options are available when the pit or vault fills up with sludge. This page includes describes some important construction details for soakaway pits, soakaway trenches and soakaway. Microorganisms in the anaerobic environment in the tank digest the sludge and scum. 2 to 4 times the length width. Herringbone. CoolA septic tank is basically a vessel buried underground, the purpose of which is the collection, storage, and, to some limited extent, treatment of sewage. into the surrounding soil by means of a soakaway. It is a hole completely filled with irregularly sized and shaped rocks. You may need to introduce columns and beams if the span is more than 4ft i. This ensures that there is uniform ponding and infiltration across the base of the soakaway. Fill your pit; Fill the bottom of your pit with about 15cm of compacted sand or shingle. Block strength not less than 5 KG/CM for Soakpit and 3. Download Now Download to read offline. 100x100x400mm OR. All soakaways must be sited at least 5m from any building or road and preferably at least 2. 8m. Pre-settled effluent from a Collection and Storage/Treatment or (Semi-) Centralized Treatment technology is discharged to the underground chamber from which it infiltrates into the surrounding soil. (ii) No allowance for infiltration area is made for the bottom area of a pit or the surface area of impervious soil layers (percolation rate slower than 60 minutes/inch). You buy cement, sharp sand and also original water proof cement/additive. ALL septic tanks that currently ultimately discharge into watercourses will have to be either: Replaced using a sewage treatment plant with full EN 12566-3 Certification instead, or. 1. Purpose: To facilitate sedimentation and decomposition of small solid particles. The purpose of this practice note is to provide some basic environmental guidelines for the handling and disposal of construction site discharges. A cesspool is. Communal toilet connected to a septic tank and drainage field Vent pipe Septic tank Minimum slope 1:40 (2. To connect the in site sewerage system to a septic tank prior to the pit latrine will stop the solid sewage and waste to reach the pit latrine. A septic tank is a system that collects and treats wastewater from a property. 0 m away from building structures (DUDH, 2002), such as walls and. To provide effective drainage for areas that flood. Pipework to transfer the rainwater from the gutters, driveway, patio etc, to the soakaway. There are two main parts to the system (apart from the flush toilet): an insulated tank which houses the worms with their associated ecosystem, and a ‘greenfilter’ or soakaway area to allow. For small tanks theOnce it sinks to the level u actually wang it, get a water pump and start sucking out the water inside the septic tank. #septictank #septictanksoakaway #soakawaypit Soak Pit Construction and Design Manual. And 100% renewable. Over 60% of all sites in the UK FAIL the three. 12. 5m deep and connected to the sewer line. g. Step- One. The cement is mixed up and soak away casted from the surface. size 150mm min. 4 m 3. Septic tanks discharging into a drainage field aren’t affected by 2022 septic tank soakaway regulations. ) (a) Sufficiently large to provide a minimum capacity for 3 days' storage. Plans containing in detail the septic tank and the soak path for the housing unit; basically the proposal has been prepared very cheaply. Both work in the same way — removing excess water. Step 2 - Dig the hole. Damage to the tank can result in solid waste particles clogging the soakaway, resulting in the drainage system surcharging. The design and construction of this vermicomposting toilet system is very simple. Y12mm diameter bars to septic tank slab Kg Y10mm diameter bars to septic tank and soak-away pits Finishings Cement and sand (1:3) 25mm thick cement screed mix 1:3 finished to wooden float finish to the floor of the inspection chambers and gulley traps Ditto but to septic tank with water proofing cement to applied to manufacturer's instructionsThe pipe within your soakaway construction should be laid to a fall of 1 in 40. For instance, a septic tank soakaway can become blocked: As a result of dip pipe or baffle issues in the septic tank. As the effluent seeps into the ground, it is purified by the soil, which uses bacteria to digest the pollutants and remove excess nitrogen and. What is the difference between septic tank and soakage pit? A soakaway is a hole dug in the ground and filled with rubble and coarse stones, designed to disperse water back into the surrounding ground without flooding. Design and Construction of Soakaway Systems 4. . Re: Construction Of Septic And Sewage Tanks When Building Homes. Soakaway systems typically consist of screens, a catch pit, a septic tank, soakaway pit, and dung channels. 8 2. Concrete soakaway rings used in a surface water. O. started a discharge from a septic tank or small sewage treatment plant. . The key document is the building regulations part – h document which can be viewed here. the roof is 180m2 We had a failed percolation test (the water didnt move a mm) within our existing boundaries, which i put down to the. plain pipe from the septic tank to the soakaway, followed by 16 metres of specially perforated 110mm diameter piping and fittings. Installing a drainage field (infiltration system) so that the septic tank discharges into the ground or,A soak pit, also known as a soakaway or leach pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. If it is, then it means that the groundwater underneath your soakaway is abstracted via a borehole somewhere and used for drinking water You will not be allowed to pollute it with sewage effluent bacteria and viruses from a septic tank or. Size - 3x6feet wide and 4feet deep. C 150mm thick and 900mm wide around in dig where brick stays. septic-tank-septic-tank-soakaway-pit - View presentation slides online. Excavate the pit where you will pour the concrete tank. Minimum capacity = 1 cubic meter (10 cubic feet). The floor of the septic tank must be made of reinforced concrete that is 100 mm deep and reinforced in accordance with local building codes. Septic tanks are a minimum of 2700 litres (650 gallons) for a 2 bedroom house. Hello. e. Essentially we are talking about a pit dug in the ground and backfilled with materials that aid the drainage. com Excavate a hole 300mm square to a depth 300mm below the proposed invert level of the soakaway pipes. Location. Septic Tank Soakaway Construction The soak-pit is connected to a primary treatment unit and serves as a connection between the septic tank and the ground. On 2022-02-17 by ebcook57developed the Septic Tank Design Manual to address the dearth of ready to use guide while designing a standard septic tank. The solids settle to the bottom, where microorganisms decompose them. c Brick Ballast Soakage Pit Cft 144. The Soak Pit which is also called the soakaway or soakage pit is a closed rectangular or circular, covered-up construction with porous or perforated walls, which is connected to. 00 8 Sewerage Pipe Providing, laying, fixing and testing uPVC soil, waste, vent and rain water as per BSS 4514 & 5255 or equivalent BS specifications including uPVC fittings with solvent cement jointing or rubber ring joints, 'Dadex' , 'Beta' , 'Master'make as approved by the Engineer complete in Ascertain whether or not your soakaway drainage field site is in an area designated by the Environment Agency as a Groundwater Source Protection Zone 1. changed your discharge from surface water to ground. Farms which can achieve very high levels of dry removal. While they may be effective for managing stormwater runoff, they do not filter or treat effluent, which can be detrimental to groundwater. A soak pit, also known as a soakaway or leach pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. No. Soak Pit Design. 2. A soakaway is a drainage pit filled with stones that diverts water into the surrounding soil. RotoTank™ has the largest variety of tanks in Southern Africa, making tanks from as small as a 50lt-tank to up 40 000lt TANK. Chapter proceeds with the introduction of septic tank followed by rationale,septic-tank- soak away and pit. A septic tank works on a pH balance and bacterial activity to break down the solid waste, and once the tank is full, it will overflow into a connected drain field, or often, a soakaway. The problem is that this area has a relatively high water table, and floods occasionally during. This will stabilize the base beneath the septic tank to reduce the possibility of shifting or cracking. The septic tank requires monthly inspections of the outlet chamber or distribution box to observe that the effluent is free flowing and clear. The broken block helps to soak up the waste water making room for more intakes. latrines in Ife North Local. In terms of other jobs, installing a new soakaway drain beneath a lawn would cost between £580 and £840. Besides, the bio-digester appear small, but. Keep it. However, there is need to inform the people and the utilities on appropriate disposal of the waste and maintenance of the facilities. Onsite septic tank systems sometimes implemented with soak-away pits are usually adopted in most buildings at low income countries of Africa because of their affordability and ease of construction. It disperses septic effluent into the soil, without causing problems due to soil saturation and 'Backing-up' of the system. 8m x 1. We recommend the second option or hiring our. Schedule of Material. A soakaway is essentially a point feature; it does not have a channel. Routine maintenance of pipe network essential. A soakaway is an efficient and low-environmental impact way of dealing with either foul or excess surface water in your drainage system. The soakaway pit is to be lined with stones, bricks, or concrete blocks laid up. It will also show you which septic tank scenarios work best. The less porous the ground, the bigger the surface area of the soakaway has to be. Construction development of a septic tank and absorption well design. Step 5 – Add Gravel and Complete the Soakaway. But the length of a reinforcement rod is 10,058mm and the span to be covered is 3048mm. Remember to consider the drainage falls required. 2 For building occupancies of 20 persons or below, a septic tank shall be connected to a soak-away pit for disposal. O. Inlet and outlet pipes shall be installed with four-inch sanitary tees constructed of schedule 40 PVC or its equivalent. It should have at least a cross-section dimension of 0. Design Procedure of soak pit. moved the location of the discharge to more than 10 metres away from. A septic tank construction should be perfect to prevent cracking and groundwater. RM 2EHY5MF – Front garden drive soakaway technique for capturing, retaining and slowing the flow of rainfall - gabion gabions stone filled retaining wall. v) Soakaway Pit/Trench. According to recommendations by the United States Environmental Protection Agency, as well as the Department of Housing and Urban Development, a septic tank should be at least 50 feet away from a well that is used for drinking water. Microorganisms in the anaerobic environment in the tank digest the sludge and scum. 1 The Choice of Soakaway 2 2. Elevation-view sketch of a tank and drywell or leaching pit or "seepage pit" system used at some older homes. It allows the effluent to percolate into the surrounding soil, where it is treated naturally through biological processes. A french drain. 2. For a larger septic tank (4,800 litres), you can expect to pay around £5,300 for supply and installation. or entering the pit 2, 3. So basically the difference between Septic Tank and Soak Away is that a Septic Tank is deeper and plastered then floored, while Soakaway is not given such treatment as the floor is left like. Box 1923, 41185 Dodoma Drawing title 24 APRIL 2018 DCNM STANDARD DESIGN FOR COUNCIL LEVEL HOSPITALS IN TANZANIA JCR STP A/101 PRESIDENT'S OFFICE, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS, MKAPA BUILDING, P. 1nos. The main function of a soak pit is to slowly soak the wastewater coming from the septic tank into the ground. The basic functions and the need for a soak pit. minimum dimension of the septic tank. P. This video will show you just how easy it is to construct a soakaway. Septic tank soakaways are unlikely to be successful i n areas of heavy clay ground. For example, you could dig a soakaway pit. This closes the pores and fissures at the excavation interface leading to. So basically the difference between Septic Tank and Soak Away is that. i light duty cover from septic tank outlet 225mm blockwork wall soakaway pit plan r1250 225 100 500-800 8000 gravel fill max. According to the second defendant, there is no chance for pollution of the plaintiff's Well water by the construction of the first defendant's septic tank, as there had been a distance of 27 feet between the soak-pit and the plaintiff's Well on the eastern side and there is a distance of 25 feet between the same soak-pit and the plaintiff's. Environmental Protection Department,content page,highlights,events and activities,press releases. In Nigeria, Septic Tank and Soakaway Pit are a combined system. Example B: 4 Bedroom + 5 Bedroom = 12 people: 12 x 150 = 1800L = 2000L = 3800L. Fill the soakaway hole with gravel or rubble up to the point that the layer is about 2cm away from the surface of the hole. The tank is much smaller than required by building codes, and the design is missing some important items such as internal baffles. A Soakaway is a pit or trench where surface water is allowed to collect and slowly soak into the surrounding soil or rock. Okay so, first of all, you need to read all of the. of users 15 40 60 50 30 7 7 8 9 6 TYPE 3 4 1 2 40. Casted Septic Tank project under construction. w. #1. 5 litres to fill a volume of this size. The Soak Pit which is also called the soakaway or soakage pit is a closed rectangular or circular, covered-up construction with porous or perforated walls, which is connected to the primary treatment unit or directly connected to the washroom and even some specific types of toilet. These are inadmissible for wastewater dispersal. Soakaways or drainage fields, as correctly termed, are ground infiltration systems used for the dispersal of partially treated waste water from septic tanks and sewage treatment plants. The soak pit is to be a hole filled with rocks. Full drainage design suite (50% Discount) including 7 spreadsheets; Soakaways built in Clay Soils need to be carefully designed in order to operate effectively due to the low infiltration rate of most clay soils. Detailed design guidance is given in BRE Digest 365 or CIRIA Report C753. In other words, cesspools provide temporary. I have an easement which allows me to maintain repair and replace the tank and soakaway. EcoBloc Flex is a modular geocellular unit which is used as a below ground stormwater attenuation or soakaway tank. 90 m and a minimum depth of 1. 2m average depth 1. One of the first things to consider when choosing a site for a soakaway is the water table. M. From excavation to. When installing a septic tank soakaway, it’s important to refer to Building Regulations Part H to ensure the installation meets the required standards,. Block strength not less than 5 KG/CM for Soakpit and 3. Download dwg Free - 99. . The waste water from the biodigester is us. soak away pit -provisional total materials cost for septic tank and soakaway pit april, 2018 page/2 po-ralg. You should not direct rain water into a cess pit or septic tank either. 5 tons of stone = N55,000. 3 Its. A seepage pit is designed to receive clarified effluent from a septic tank, or if the pit receives only graywater wate then it's called a drywell. Use M-15 grade of P. We give attention to every Offer both New Jobs and Maintenance Call Us On: 08023425934,. Septic tank and absorption pit. A soakaway is especially useful in built-up areas that have been built from impermeable materials, as it allows water that would usually pool and flood to naturally ‘soak away’. Therefore, we would need 10,058/3058 = 3. 4268/175 = 24 lengths of rod. 6m deep) Cost Of Excavation: Manual labor was used, soil is very hard and rocky at some point so the cost of excavation would be around N35,000. Soakage. Area (A) = V X P X 0. 15m from any building, and sufficiently distant from any other.