I don't know what you're trying to ask, .
"Normal" septic tanks need percolation areas to work.
These have a "system" of pipe runs to disperse run off from the settlement tank.
All sites require to be assessed to determine the number of pipes based on the ground conditions.
As part of a planning application, you have to show prima fascie proof that the site can accommodate a septic tank and percolation system.
This may includes satisfying various rule of thumb distance requirements for the several elements including separation distances from any bored well on site.
As part of this proof a trial hole may be needed.
The old standard was SR6:1991 - this is a link to one of the test sheets.
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Under SR6:1991 a Trial Hole and Percolation Text was needed, involving a hole 1.5M x 1.5M x 2M deep.
Then a percolation test was done with a 300mm square hole about 350mm deep.
Things have changed since then, allowing for a more economical approach for those with limited means using and experienced assessor and a desk study.
However the requirement to carry out an assessment is mandatory.
The below link gives current requirements for Co Clare
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This clearly states:
"In all cases where an application involves a proposal to use a septic tank or other on-site treatment system, a site assessment is required."
I draw your attention to this passage.
"The cost of the assessment should be agreed with the site assessor. Ideally, a cost could be negotiated for each part of the assessment described. This allows the applicant to decide whether or not to proceed to a full site assessment, and a full planning application. This approach should be agreed before starting any part of a site assessment. The fee does not include digging the holes. A desk study, together with the experience of the assessor, will indicate a site that is unlikely to pass the assessment. It is more appropriate to spend a smaller fee on this advice, than a larger fee on a full report for a failed site."
FWIW
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.