{"id":766,"date":"2012-06-22T09:30:40","date_gmt":"2012-06-22T08:30:40","guid":{"rendered":"http:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/?p=766"},"modified":"2022-10-20T12:34:48","modified_gmt":"2022-10-20T11:34:48","slug":"important-changes-to-bs-relating-to-trees-by-bernie-harverson","status":"publish","type":"post","link":"https:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/important-changes-to-bs-relating-to-trees-by-bernie-harverson\/","title":{"rendered":"Important changes to BS relating to trees by Bernie Harverson"},"content":{"rendered":"<div class='booster-block booster-read-block'>\n                <div class=\"twp-read-time\">\n                \t<i class=\"booster-icon twp-clock\"><\/i> <span>Read Time:<\/span>4 Minute, 32 Second                <\/div>\n\n            <\/div><p><strong><span style=\"font-family: Times New Roman; color: #000000; font-size: small;\">Arboriculturist Bernie Harverson who works independently from our offices (but is a frequent <em>Terra Firma<\/em> sub-consultant)\u00a0has offered some useful insights into the latest BS on trees; these are inevitably important considerations for landscape architects:<\/span><\/strong><\/p>\n<p><span style=\"font-family: Times New Roman; color: #000000; font-size: small;\">Without much prior warning or pre-issue seminars on 30<\/span><sup><span style=\"font-family: Times New Roman; color: #000000; font-size: small;\">th<\/span><\/sup><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\"> April 2012 we in the \u2018Arb World\u2019 had British Standard 5837:2012 thrust upon us and for a while there was a mad panic to get our heads around it. Luckily this applied to both public and private sector arboriculturists and thankfully it seems Local Authority tree officers have had the same situation to cope with and most have agreed to a \u2018Honeymoon Period\u2019 whilst we all get used to using it.<\/span><\/span><\/span><\/p>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The primary changes are headlined below:-<\/span><\/span><\/span><\/p>\n<ul>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">As well as a Topographical Plan of the development site showing all the trees with levels at the tree bases and contours shown to highlight any proposed changes in levels close to trees the BS now recommends that a Soil Assessment is carried out to enable the arb expert to advise on foundation design relative to the soils potential for shrinkage or heave \u2013 plus advise on the appropriate choice of tree species for new planting on the site.<\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">Multi-stemmed trees are to have their Root Protection Areas (RPA\u2019s) calculated in a new way \u2013 with all stems at 1.5m measured out on site and the data applied to a complicated mathematical equation in order to derive the RPA. <\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The old R grading with a presumption for removal has been replaced by a U for unsuitable for retention \u2013 thus opening up debate on whether these trees should be automatically removed.<\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">With the old C grading there was a presumption to remove if the tree imposed a significant constraint on development \u2013 now these trees are to be presumed retained unless there is a very good reason put forward that justifies their removal.<\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The previous dangerous and often abused statement that \u2018<em>For individual open grown trees only, it may be acceptable to offset the distance by up to 20% in one direction[2005]\u2019<\/em> has been removed and no longer applies. This has however been replaced by \u2013 <strong><em>\u2018..where there is an overriding justification for construction within the RPA, technical solutions might be available that prevent damage to trees.[2012]<\/em>\u2019<\/strong> <\/span><\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">\u2013\u00a0 if it is agreed that this is appropriate then it is then the arb experts task to :-<\/span><\/span><\/span><\/p>\n<p><strong><em><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">\u2018 a) demonstrate that the tree(s) can remain viable and that the area lost to encroachment can be compensated for elsewhere, contiguous with its RPA.<\/span><\/span><\/span><\/em><\/strong><\/p>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\"><strong><em><a href=\"http:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/1406-Wanborough-Swindon-Tree-Survey-1-500-at-A3.png\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-770\" title=\"1406 Wanborough, Swindon - Tree Survey 1-500 at A3\" src=\"http:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/1406-Wanborough-Swindon-Tree-Survey-1-500-at-A3-300x212.png\" alt=\"\" width=\"300\" height=\"212\" srcset=\"https:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/1406-Wanborough-Swindon-Tree-Survey-1-500-at-A3-300x212.png 300w, https:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/1406-Wanborough-Swindon-Tree-Survey-1-500-at-A3-1024x724.png 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/em><\/strong><\/span><\/span><\/span><\/p>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\"><strong><em>b) propose a series of mitigation measures to improve the soil environment that is used by the tree for growth.[2012]<\/em><\/strong><em>\u2019<\/em><\/span><\/span><\/span><\/p>\n<ul>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The old Arboricultural Implications Assessment has been re-named the <strong>Arboricultural Impact Assessment <\/strong>and the list of matters that are to be covered by this document have been increased significantly with emphasis placed on shading issues; privacy & screening; pressure to prune or fell; seasonal nuisance etc etc.<strong><\/strong><\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The old Tree Constraints Plan has been replaced with the requirement for a plan [which I refer to now as the <strong>Tree Retentions & Removals Plan<\/strong>] which shows the tree survey data; root protection data; trees selected for retention; tree to be removed; trees to be pruned & areas for landscaping.<strong><\/strong><\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The old Arboricultural Method Statement is no longer an essential requirement at the planning submission stage although the principles of mitigation measures must be clearly highlighted but can be left as \u2018Heads of Terms\u2019 only at this juncture and it is then up to the LPA to Condition the submission of a detailed Method Statement at a later stage \u2013 thus presumably speeding up the decision making process and not delaying approvals on schemes.<strong><\/strong><\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">Protective Fencing Barriers are still required to be \u2018fit for the purpose of excluding construction activity and the default position is still for scaffold framework with supports and driven back stays and weldmesh panels firmly secured to them. However, provision has now been made for two alternative forms of back stay where there is existing hard surfacing or underground obstruction OR a high risk of root damage by driving scaffold posts into the ground.<strong><\/strong><\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">The old Ground Protection drawing under Figure 3[2005] has been removed and replaced with wording that describes varying levels of ground protection to suit construction activity for \u2013 pedestrian only access; pedestrian operated plant up to 2 tonnes and wheeled or tracked vehicles exceeding 2 tonnes. <strong><\/strong><\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">Site Monitoring \u2013 there is a significant emphasis on the need for an auditable system of arboricultural site monitoring or direct site supervision of activities close to any RPA\u2019s.<strong><\/strong><\/span><\/span><\/span><\/li>\n<li><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">Permanent Hard Surfacing within RPA\u2019s \u2013 this is perhaps the most significant change as far as Architects and indeed Landscape Architects are concerned in that the new recommendations are that \u2013 <strong>\u2018New permanent hard surfacing should not exceed 20% of any existing unsurfaced ground within the RPA.[2012]\u2019 <\/strong><\/span><\/span><\/span><\/li>\n<\/ul>\n<p><strong><span style=\"font-family: Times New Roman; color: #000000; font-size: small;\">\u00a0<a href=\"http:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/2012-05-23-16.57.22.jpg\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-767\" title=\"2012-05-23 16.57.22\" src=\"http:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/2012-05-23-16.57.22-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/2012-05-23-16.57.22-300x225.jpg 300w, https:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/wp-content\/uploads\/2012\/06\/2012-05-23-16.57.22.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><\/strong><\/p>\n<p><strong><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">Conclusions <\/span><\/span><\/span><\/strong><\/p>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">In my opinion in trying to strip down and streamline and speed up the decision making process they have actually made it more arduous and costly.<\/span><\/span><\/span><\/p>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">For the arboricultural experts there will be more time spent out on site collecting the additional data and then more time spent addressing all of the issues which now need to be included in the Arboricultural Impact Assessment report.<\/span><\/span><\/span><\/p>\n<p><span style=\"font-size: small;\"><span style=\"color: #000000;\"><span style=\"font-family: Times New Roman;\">For the client the bottom line is that time equals money and the cost of undertaking this extra work will inevitably have to be passed on to the clients.<\/span><\/span><\/span><\/p>\n<p><span style=\"font-family: Times New Roman; color: #000000; font-size: small;\">\u00a0<\/span><\/p>\n<p><span style=\"font-family: Times New Roman; color: #000000; font-size: small;\">\u00a0<\/span><\/p>\n        <div class=\"booster-block booster-reactions-block\">\n            <div class=\"twp-reactions-icons\">\n          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Without much prior warning or pre-issue seminars on 30th April 2012 we in the \u2018Arb World\u2019 had British Standard 5837:2012 thrust [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63],"tags":[],"class_list":["post-766","post","type-post","status-publish","format-standard","hentry","category-landscape-architect"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Important changes to BS relating to trees by Bernie Harverson - terra firma blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.terrafirmaconsultancy.com\/landscape-architect-blog\/important-changes-to-bs-relating-to-trees-by-bernie-harverson\/\" \/>\n<meta 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