British Standards 5837:2012 ‘Trees in Relation to Design, Demolition and Construction – Recommendations’ Survey. BS5837 tree surveys are required as a means of recording tree data and their dimensions when carrying out development or construction close to trees. These surveys are often requested by the local planning department as part of an application for planning permission.
The surveys include a site visit, tree assessment, report and the production of a Tree Constraints Plan (TCP).
During the site visit the trees are assessed for quality and assigned a retention category. Trees of poor quality, i.e. dead trees or trees with serious structural defects are recommended for removal. Each retained tree or group of trees is then plotted on the Tree Constraints Plan. The rooting area of each tree is calculated using the formula within BS5837 and also plotted on the drawing (this is the area which should ideally be left undisturbed by construction activity throughout the development phase).
Tree Constraints Plan (TCP) identifies the locations of the trees, their tree schedule reference number, their assessment category i.e. A, B, C or U, representations of their crown spreads and their Root Protection Areas (RPA’s). If necessary, the TCP will be made available for your clients’ architect in CAD format for the purpose of identifying an optimal proposed site layout.
Arboricultural Impact Assessment (AIA) is a type of tree report that considers how a proposed development and its associated trees will co-exist and interact in the present and future. An AIA is a document that many Local Planning Authorities (LPA) are now requesting as part of a planning application.
AIA are recommended at an early stage within the planning process as it can identify and remove potential conflicts between the trees and the requirements of the development.
Arboricultural Method Statement contains a timetable indicating when and how specific works adjacent to trees should be carried out. This will cover items such as the installation of protective fencing, hand excavation within tree protection zones, surface changes, trenching methods etc.
A method statement is linked to the TPP and may in some cases be adequately incorporated onto the TPP drawing.
Tree Protection Plan (TPP) from AIA report with an accompanied TPP, will indicate the locations of where the erection of protective fencing is required and any other tree protection measures are required. The TPP, the phasing of any tree works that are considered necessary and any operations, including likely access, proposed within the RPAs.