BS5837: 2012 Trees in relation to design, demolition - Arboricultural ...

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BS5837: 2012 Trees in relation to design, demolition and construction AA Road show presentation notes: Richard Nicholson May-July 2012 Edited by Mike Sankus in levels. It also deals with the buildability of the scheme. This includes recommendations for any necessary mitigation. Items at paragraph 5.4.3 were included in the Arboricultural Method Statement in BS5837: 2005. The Arboricultural Impact Assessment is a document that Local Planning Authorities should require at the planning application stage, prior to validating a planning application. Sub section 5.5 - Tree Protection Plan The construction exclusion zone is better defined but downplayed in BS5837: 2012. It was heading 9 in BS5837: 2005. It’s now the area inside what would usually, but not always be, the vertical barriers. In some circumstances ground protection could be considered appropriate or a combination of both but it remains the area within the barriers that is the construction exclusion zone. Sub section 5.6 - New planting design and associated landscape operations New planting design and associated operations has been brought into BS5837: 2012 at this early stage because it sits comfortably within the Conceptual Design stage of the RIBA work stages. This is still prior to planning permission or client approval if no planning permission is needed (permitted development?). There is a useful commentary on the importance of trees in design and landscape. Section 6 - Technical design At this stage planning permission has been given and the following will have been completed and where appropriate submitted with the planning application for validation purposes. 1) Topographical survey 2) Soil assessment 3) Tree survey 4) Tree categorisation 5) Tree constraints and RPAs are identified and used to influence design 6) Arboricultural Impact Assessment (see list at paragraph 5.4.3) 7) The issues to be addressed by an arboricultural method statement. Includes heads of terms of Arboricultural Method Statement to provide certainty of outcome. It relates to advice in paragraph 5.4.3 (h) mentioned above. 8) Landscape proposals 9) A tree protection plan (see level D of Fig 1)
BS5837: 2012 Trees in relation to design, demolition and construction AA Road show presentation notes: Richard Nicholson May-July 2012 Edited by Mike Sankus 10) Special engineering within RPA and other relevant construction details referred to in paragraph 6.1.2 (d & e). Commentary on clause 6 refers to draft form or heads of terms sufficient to provide a high level of confidence, but also see paragraph 7.1.3, which makes clear that technical feasibility should be tested at planning application stage by submitting details with the planning application (prior to validation). See also paragraphs 7.2.1 and 7.5.5, which give more useful guidance on works inside the RPA and paragraph 5.3.1, which sets the default position and parameters of rational to undertake operations within the RPA. . Sub section 6.1 - Arboricultural Method Statement What is an Arboricultural Method Statement and when are they relevant? See paragraphs 6.1.1 through to 6.1.3 for details of what may be included. They apply whenever any aspect of development lies inside the RPA (see paragraph 3.2). It's about implementation. Paragraph 6.1.2 - The Arboricultural Method Statement should be appropriate to the proposals. Paragraph 6.1.2e) – This is an important statement for certainty of outcome. Paragraph 6.1.3 – Method statement should include a list of contacts for the development to ease communication. Sub section 6.2 - Barriers and ground protection OED Definitions: Barrier: ‘anything serving to obstruct passage or to maintain separation, such as a fence’ Fence: ‘structure that encloses an area’ which could be a chain on posts. Paragraphs 6.2.2.2 and 6.2.2.3 – These set a default specification and the alternatives where circumstances allow for an alternative specification for the barrier. Paragraph 6.2.3.3 - Ground protection solutions are provided in this paragraph, which contains more information. There are three suggested scenarios in BS5837: 2012, which is an improvement over BS5837: 2005 which only referred to ‘engineered’ and ‘fit for purpose’. Section 7 - Demolition and construction in proximity to existing trees. Paragraph 7.1.1 - Makes clear that the tree and soil structure inside the RPA takes priority when considering construction inside the RPA (see paragraph 3.7 - definition of RPA, which talks about maintaining tree’s viability and where the protection of roots and soil structure is a priority). See also paragraph 5.3.1, which states that the default position is that structures are located outside the RPA of trees to be retained. In BS5837: 2005 there was the flexibility to allow a 20% setback of the RPA, but this no longer applies. The assumption now is that it is not a given: building in the RPA was considered acceptable and almost the
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