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Site Assessment

Site suitability assessment for onsite waste water treatment systems (Percolations)

A site suitability assessment is used to determine if a septic tank or wastewater treatment system is suitable for the proposed development. If the site is suitable the assessment is use to design the type and size of percolation area / polishing filter. Currently Local Authorities planning conditions required that the site suitability assessment be carried out in accordance with the EPA 2009 Code of Practice guidelines.

Leinster Property Assessors offer Site Suitability Assessments (Percolation Tests) to EPA code of practice 2009 standard for planning applications and upgrades of existing wastewater treatment systems.

We also offer system inspections to people concerned about the new EPA Wastewater Treatment registration and standards required of your system.

Our Engineers are all covered by Full Professional Indemnity Insurance and have completed the EPA/FAS "Site Suitability On-Site Wastewater" course.

Soakway Test to BRE Digest 365 Standards

A BRE Digest 365 test is carried out to determine the volume required for a rainwater or stormwater soakaway. In Ireland now, a lot of the County Councils require a BRE Digest 365 test to be carried and submitted with your planning application.

In recent years, soakaways have been used within urban, fully-sewered areas to limit the impact on discharge of new upstream building works and to avoid costs of sewer upgrading outside a development. Soakaways are seen increasingly as a more widely applicable option alongside other means of stormwater control and disposal. Soakaways must store the immediate stormwater run-off and allow for its efficient infiltration into the adjacent soil. They must discharge their stored water sufficiently quickly to provide the necessary capacity to receive run-off from a subsequent storm.

The time taken for discharge depends upon the soakaway shape and size, and the surrounding soil’s infiltration characteristics. They can be constructed in many different forms and from a range of materials.

What is a Percolation Test / Site Suitability Assessment?

A Percolation Test or a Site Suitability Assessment is a method of measuring how well your site can drain water away through the subsoil. It is usually required to give an indication to the Planning Department of your Local Council of how suitable the site in question will be to discharge the effluents from a dwelling to the soils. This is the first step you need to take in order to determine if the site is suitable for any type of discharge to ground soils and what type of systems are available to choose from.

What does a Percolation Test / Site Suitability Assessment involve?

Percolation Tests fundamentally involve various small excavations made at different points around the site. These small holes are then filled with water and left overnight. The next day the hole will be refilled and the rate of fall is timed in seconds. This is done several times and an average is taken. A report is then prepared by our engineers which can be used, for example, to show the suitability of a private septic tank and percolation area on a site.

The infiltration rate or percolation rate is then put together in a report format with a number of other maps of the area and drawings of the proposed system. The whole process normally takes 5-7 working days. This report is then lodged with a planning application normally for a dwelling or extension for approval to the County Council.