{"id":920988,"date":"2026-09-29T14:00:00","date_gmt":"2026-09-29T12:00:00","guid":{"rendered":"https:\/\/djya2ldob4.wpdns.site\/?page_id=920988"},"modified":"2026-10-30T10:12:42","modified_gmt":"2026-10-30T09:12:42","slug":"os35","status":"publish","type":"page","link":"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/os35\/","title":{"rendered":"SOA category OS35"},"content":{"rendered":"\n\n<div class=\"cqop-v6 cqop-v6-soa-categoria-os35\" data-v6-page=\"Categoria-OS35\">\n\n<div class=\"cqop-v6-pannello-829311a\" id=\"contenuto\">\n\n<div class=\"gb-text cqop-v6-pannello-fd08351\" aria-hidden=\"true\"><\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-d3705ba\" aria-hidden=\"true\"><\/div>\n\n\n\n\n\n<div class=\"cqop-v6-contenuto-06a0e85\"><nav style=\"--separator: &quot;\/&quot;\" class=\"cqop-breadcrumbs wp-block-breadcrumbs\" aria-label=\"Breadcrumbs\"><ol><li><a href=\"https:\/\/www.cqop.com\/en\/\">Home<\/a><\/li><li><a href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/\">List of SOA categories<\/a><\/li><li><a href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/\">SOA specialised works categories<\/a><\/li><li><span aria-current=\"page\">SOA category OS35<\/span><\/li><\/ol><\/nav>\n\n\n\n<div class=\"cqop-v6-pannello-f3875ab\">\n\n<span class=\"gb-text cqop-v6-pannello-4855609\">OS35<\/span>\n\n\n\n\n\n<span class=\"gb-text cqop-v6-pannello-ea96d22\">Specialised works categories<\/span>\n\n<\/div>\n\n\n\n\n\n<h1 class=\"gb-text cqop-v6-titolo-b35a3b5\">SOA category <span class=\"cqop-v6-pannello-8a3115e\">OS35<span aria-hidden=\"true\" class=\"cqop-v6-pannello-f4fc0bb\"><\/span><\/span><\/h1>\n\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-7496375\">Low environmental impact works<\/p>\n\n\n\n\n<div class=\"gb-text cqop-category-requirements\">Requirement: Skilled workers holding the appropriate licence<\/div>\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-642d0e4\">\n\n<div>\n<p class=\"gb-text cqop-v6-testo-43af25e\"><strong class=\"cqop-v6-pannello-7f02261\">OS35<\/strong> covers <strong class=\"cqop-v6-pannello-7f02261\">low environmental impact works<\/strong>: <strong class=\"cqop-v6-pannello-7f02261\">\u201ctrenchless\u201d or \u201cno-dig\u201d<\/strong> technologies that make it possible to lay, replace or rehabilitate pipes and cable ducts <strong class=\"cqop-v6-pannello-7f02261\">without digging trenches<\/strong>. It includes horizontal directional drilling (<strong class=\"cqop-v6-pannello-7f02261\">HDD<\/strong>), <strong class=\"cqop-v6-pannello-7f02261\">microtunnelling<\/strong>, pipe rehabilitation with <strong class=\"cqop-v6-pannello-7f02261\">CIPP<\/strong>, CCTV inspection of networks and <strong class=\"cqop-v6-pannello-7f02261\">micro-trenching<\/strong> for fibre. It is strategic for <strong class=\"cqop-v6-pannello-7f02261\">fibre optics<\/strong> and for the <strong class=\"cqop-v6-pannello-7f02261\">rehabilitation of water and sewer networks<\/strong>.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-136555f\">\n\n<div class=\"cqop-v6-pannello-be753d0\">\n\n<svg focusable=\"false\" role=\"presentation\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 201 201\" width=\"201\" height=\"201\" aria-hidden=\"true\" class=\"cqop-os-original-icon\" style=\"display:block;width:120px;height:120px;max-width:none;margin:0 0 28px;\"><path fill=\"#fff\" d=\"M16.9 97.9h2.2v2.2h-2.2zM21.36 97.9h2.2v2.2h-2.2zM25.82 97.9h2.2v2.2h-2.2zM30.28 97.9h2.2v2.2h-2.2zM34.74 97.9h2.2v2.2h-2.2zM39.2 97.9h2.2v2.2h-2.2zM43.66 97.9h2.2v2.2h-2.2zM48.12 97.9h2.2v2.2h-2.2zM52.58 97.9h2.2v2.2h-2.2zM57.04 97.9h2.2v2.2h-2.2zM61.49 97.9h2.2v2.2h-2.2zM65.95 97.9h2.2v2.2h-2.2zM70.41 97.9h2.2v2.2h-2.2zM74.87 97.9h2.2v2.2h-2.2zM79.33 97.9h2.2v2.2h-2.2zM83.79 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90.9h2.2v2.2h-2.2zM54.57 90.9h2.2v2.2h-2.2zM49.9 90.9h2.2v2.2h-2.2zM45.23 90.9h2.2v2.2h-2.2zM40.57 90.9h2.2v2.2h-2.2zM35.9 90.9h2.2v2.2h-2.2zM31.23 90.9h2.2v2.2h-2.2zM26.57 90.9h2.2v2.2h-2.2zM21.9 90.9h2.2v2.2h-2.2zM21.9 86.57h2.2v2.2h-2.2zM21.9 82.23h2.2v2.2h-2.2zM21.9 77.9h2.2v2.2h-2.2zM21.9 73.57h2.2v2.2h-2.2zM21.9 69.23h2.2v2.2h-2.2zM39.9 94.9h2.2v2.2h-2.2zM38.63 99.23h2.2v2.2h-2.2zM35.22 102.18h2.2v2.2h-2.2zM30.76 102.82h2.2v2.2h-2.2zM26.66 100.95h2.2v2.2h-2.2zM24.22 97.15h2.2v2.2h-2.2zM24.22 92.65h2.2v2.2h-2.2zM26.66 88.85h2.2v2.2h-2.2zM30.76 86.98h2.2v2.2h-2.2zM35.22 87.62h2.2v2.2h-2.2zM38.63 90.57h2.2v2.2h-2.2zM62.9 94.9h2.2v2.2h-2.2zM61.63 99.23h2.2v2.2h-2.2zM58.22 102.18h2.2v2.2h-2.2zM53.76 102.82h2.2v2.2h-2.2zM49.66 100.95h2.2v2.2h-2.2zM47.22 97.15h2.2v2.2h-2.2zM47.22 92.65h2.2v2.2h-2.2zM49.66 88.85h2.2v2.2h-2.2zM53.76 86.98h2.2v2.2h-2.2zM58.22 87.62h2.2v2.2h-2.2zM61.63 90.57h2.2v2.2h-2.2z\"\/><path fill=\"#D98296\" d=\"M63.9 78.9h2.2v2.2h-2.2zM67.04 81.76h2.2v2.2h-2.2zM70.19 84.61h2.2v2.2h-2.2zM73.33 87.47h2.2v2.2h-2.2zM76.47 90.33h2.2v2.2h-2.2zM79.61 93.19h2.2v2.2h-2.2zM82.76 96.04h2.2v2.2h-2.2zM85.9 98.9h2.2v2.2h-2.2zM87.78 102.9h2.2v2.2h-2.2zM89.65 106.9h2.2v2.2h-2.2zM91.52 110.9h2.2v2.2h-2.2zM93.4 114.9h2.2v2.2h-2.2zM95.28 118.9h2.2v2.2h-2.2zM97.15 122.9h2.2v2.2h-2.2zM99.02 126.9h2.2v2.2h-2.2zM100.9 130.9h2.2v2.2h-2.2zM105.07 132.9h2.2v2.2h-2.2zM109.23 134.9h2.2v2.2h-2.2zM113.4 136.9h2.2v2.2h-2.2zM117.57 138.9h2.2v2.2h-2.2zM121.73 140.9h2.2v2.2h-2.2zM125.9 142.9h2.2v2.2h-2.2zM130.48 142.9h2.2v2.2h-2.2zM135.07 142.9h2.2v2.2h-2.2zM139.65 142.9h2.2v2.2h-2.2zM144.23 142.9h2.2v2.2h-2.2zM148.82 142.9h2.2v2.2h-2.2zM153.4 142.9h2.2v2.2h-2.2zM157.98 142.9h2.2v2.2h-2.2zM162.57 142.9h2.2v2.2h-2.2zM167.15 142.9h2.2v2.2h-2.2zM171.73 142.9h2.2v2.2h-2.2zM176.32 142.9h2.2v2.2h-2.2zM180.9 142.9h2.2v2.2h-2.2zM109.9 149.9h2.2v2.2h-2.2zM114.28 149.9h2.2v2.2h-2.2zM118.65 149.9h2.2v2.2h-2.2zM123.02 149.9h2.2v2.2h-2.2zM127.4 149.9h2.2v2.2h-2.2zM131.78 149.9h2.2v2.2h-2.2zM136.15 149.9h2.2v2.2h-2.2zM140.52 149.9h2.2v2.2h-2.2zM144.9 149.9h2.2v2.2h-2.2zM149.28 149.9h2.2v2.2h-2.2zM153.65 149.9h2.2v2.2h-2.2zM158.02 149.9h2.2v2.2h-2.2zM162.4 149.9h2.2v2.2h-2.2zM166.78 149.9h2.2v2.2h-2.2zM171.15 149.9h2.2v2.2h-2.2zM175.52 149.9h2.2v2.2h-2.2zM179.9 149.9h2.2v2.2h-2.2z\"\/><path fill=\"#fff\" d=\"M156.9 97.9h2.2v2.2h-2.2zM156.9 93.35h2.2v2.2h-2.2zM156.9 88.81h2.2v2.2h-2.2zM156.9 84.26h2.2v2.2h-2.2zM156.9 79.72h2.2v2.2h-2.2zM156.9 75.17h2.2v2.2h-2.2zM156.9 70.63h2.2v2.2h-2.2zM156.9 66.08h2.2v2.2h-2.2zM156.9 61.54h2.2v2.2h-2.2zM156.9 56.99h2.2v2.2h-2.2zM156.9 52.45h2.2v2.2h-2.2zM156.9 47.9h2.2v2.2h-2.2zM156.9 14.9h2.2v2.2h-2.2zM154.52 18.52h2.2v2.2h-2.2zM152.15 22.15h2.2v2.2h-2.2zM149.78 25.78h2.2v2.2h-2.2zM147.4 29.4h2.2v2.2h-2.2zM145.02 33.02h2.2v2.2h-2.2zM142.65 36.65h2.2v2.2h-2.2zM140.28 40.28h2.2v2.2h-2.2zM137.9 43.9h2.2v2.2h-2.2zM137.9 47.9h2.2v2.2h-2.2zM137.9 51.9h2.2v2.2h-2.2zM137.9 55.9h2.2v2.2h-2.2zM137.9 59.9h2.2v2.2h-2.2zM141.57 62.57h2.2v2.2h-2.2zM145.23 65.23h2.2v2.2h-2.2zM148.9 67.9h2.2v2.2h-2.2zM153.65 67.15h2.2v2.2h-2.2zM158.4 66.4h2.2v2.2h-2.2zM163.15 65.65h2.2v2.2h-2.2zM167.9 64.9h2.2v2.2h-2.2zM170.57 61.57h2.2v2.2h-2.2zM173.23 58.23h2.2v2.2h-2.2zM175.9 54.9h2.2v2.2h-2.2zM174.9 50.23h2.2v2.2h-2.2zM173.9 45.57h2.2v2.2h-2.2zM172.9 40.9h2.2v2.2h-2.2zM170.61 37.19h2.2v2.2h-2.2zM168.33 33.47h2.2v2.2h-2.2zM166.04 29.76h2.2v2.2h-2.2zM163.76 26.04h2.2v2.2h-2.2zM161.47 22.33h2.2v2.2h-2.2zM159.19 18.61h2.2v2.2h-2.2z\"\/><path fill=\"#D98296\" d=\"M143.9 47.9h2.2v2.2h-2.2zM147.15 50.65h2.2v2.2h-2.2zM150.4 53.4h2.2v2.2h-2.2zM153.65 56.15h2.2v2.2h-2.2zM156.9 58.9h2.2v2.2h-2.2zM159.65 54.9h2.2v2.2h-2.2zM162.4 50.9h2.2v2.2h-2.2zM165.15 46.9h2.2v2.2h-2.2zM167.9 42.9h2.2v2.2h-2.2z\"\/><path fill=\"#fff\" d=\"M16.9 123.9h2.2v2.2h-2.2zM21.5 123.9h2.2v2.2h-2.2zM26.1 123.9h2.2v2.2h-2.2zM30.7 123.9h2.2v2.2h-2.2zM35.3 123.9h2.2v2.2h-2.2zM39.9 123.9h2.2v2.2h-2.2zM44.5 123.9h2.2v2.2h-2.2zM49.1 123.9h2.2v2.2h-2.2zM53.7 123.9h2.2v2.2h-2.2zM58.3 123.9h2.2v2.2h-2.2zM62.9 123.9h2.2v2.2h-2.2zM75.9 123.9h2.2v2.2h-2.2zM80.4 123.9h2.2v2.2h-2.2zM84.9 123.9h2.2v2.2h-2.2zM89.4 123.9h2.2v2.2h-2.2zM93.9 123.9h2.2v2.2h-2.2zM16.9 163.9h2.2v2.2h-2.2zM21.5 163.9h2.2v2.2h-2.2zM26.1 163.9h2.2v2.2h-2.2zM30.7 163.9h2.2v2.2h-2.2zM35.3 163.9h2.2v2.2h-2.2zM39.9 163.9h2.2v2.2h-2.2zM44.5 163.9h2.2v2.2h-2.2zM49.1 163.9h2.2v2.2h-2.2zM53.7 163.9h2.2v2.2h-2.2zM58.3 163.9h2.2v2.2h-2.2zM62.9 163.9h2.2v2.2h-2.2zM75.9 163.9h2.2v2.2h-2.2zM80.4 163.9h2.2v2.2h-2.2zM84.9 163.9h2.2v2.2h-2.2zM89.4 163.9h2.2v2.2h-2.2zM93.9 163.9h2.2v2.2h-2.2zM16.9 179.9h2.2v2.2h-2.2zM21.5 179.9h2.2v2.2h-2.2zM26.1 179.9h2.2v2.2h-2.2zM30.7 179.9h2.2v2.2h-2.2zM35.3 179.9h2.2v2.2h-2.2zM39.9 179.9h2.2v2.2h-2.2zM44.5 179.9h2.2v2.2h-2.2zM49.1 179.9h2.2v2.2h-2.2zM53.7 179.9h2.2v2.2h-2.2zM58.3 179.9h2.2v2.2h-2.2zM62.9 179.9h2.2v2.2h-2.2zM75.9 179.9h2.2v2.2h-2.2zM80.4 179.9h2.2v2.2h-2.2zM84.9 179.9h2.2v2.2h-2.2zM89.4 179.9h2.2v2.2h-2.2zM93.9 179.9h2.2v2.2h-2.2z\"\/><\/svg>\n\n<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-96ce454\">Simulate the cost of SOA certification<\/div>\n\n\n\n\n\n<a class=\"gb-text cqop-v6-pulsante-5eba899 cqop-v6-state-6d47db8\" href=\"https:\/\/www.cqop.com\/en\/online-services\/fee-and-requirements-calculation\/\">Calculate fees and requirements<\/a>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv61850 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os35_image2-en.webp\" alt=\"OS35 types: horizontal directional drilling (HDD), shield microtunnelling, CIPP rehabilitation of existing networks\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">OS35 types: horizontal directional drilling (HDD), shield microtunnelling, CIPP rehabilitation of existing networks<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-74a4c6d\">\n\n<div class=\"cqop-v6-titolo-sticky-1c8b9f9\">\n\n<h2 class=\"gb-text cqop-v6-titolo-ecc189a\">SOA certification OS35: areas of application<\/h2>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-71e1793\">\n<p class=\"gb-text cqop-v6-testo-04d085f\"><strong class=\"cqop-v6-pannello-7f02261\">OS35<\/strong> brings together technologies that work underground <strong class=\"cqop-v6-pannello-7f02261\">without opening up roads and pavements<\/strong>. The main sectors:<\/p>\n\n\n\n\n<ul class=\"cqop-v6-pannello-9bf0cf7\">\n\n<li class=\"gb-text cqop-v6-griglia-eaa3518\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">01<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Horizontal directional drilling (HDD):<\/strong> crossing roads, railways and rivers without interrupting traffic. It is the leading technology for large fibre networks.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">02<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Microtunnelling:<\/strong> small tunnels, from 30 cm to 4 metres, for large-diameter sewers and water mains.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">03<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">CIPP rehabilitation:<\/strong> a resin-impregnated liner, cured inside the old pipe, creates a new pipe without digging.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">04<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Pipe bursting and slip-lining:<\/strong> replacement of existing pipes by bursting them or inserting a new pipe inside.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">05<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">CCTV inspection:<\/strong> camera robots that inspect sewers and water mains from the inside and map faults.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\"><span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">06<\/span> <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Micro-trenching:<\/strong> trenches a few centimetres wide for laying fibre optics in cities.<\/span><\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">07<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Spot repairs:<\/strong> robots that enter the pipe and repair only the damaged point.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-8357285\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">08<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Working shafts:<\/strong> launch and reception shafts and other underground access works.<\/span>\n            <\/li>\n\n<\/ul>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-930206b\"><strong class=\"cqop-v6-pannello-7f02261\">In short:<\/strong> OS35 is the category of <strong class=\"cqop-v6-pannello-962ca18\">\u201cunderground surgery\u201d<\/strong>, among the qualifications set to grow most in the coming years.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv61871 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os35_image3-en.webp\" alt=\"Diagram of horizontal directional drilling (HDD) to cross a watercourse without disturbing the surface or the environment\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">Diagram of horizontal directional drilling (HDD) to cross a watercourse without disturbing the surface or the environment<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-contenuto-c7714c8\">\n\n<h2 class=\"gb-text cqop-v6-titolo-e915111\">SOA categories related to OS35<\/h2>\n\n\n\n\n\n<div class=\"cqop-v6-griglia-86cb130\">\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS19<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Telecommunication and data transmission network systems<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the natural partner in <strong class=\"cqop-v6-pannello-7f02261\">fibre optics<\/strong>: OS35 lays the cable ducts, OS19 the fibre and equipment. Together they offer a complete service.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS21<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Special structural works<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">carries out <strong class=\"cqop-v6-pannello-7f02261\">foundations and consolidation<\/strong>; OS35 <strong class=\"cqop-v6-pannello-7f02261\">linear works<\/strong> such as pipes and cable ducts. They share equipment and staff.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG6<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Water mains, gas pipelines, oil pipelines, irrigation and drainage works<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the <strong class=\"cqop-v6-pannello-7f02261\">prevailing category<\/strong> in large water networks; OS35 comes in as a separable category for <strong class=\"cqop-v6-pannello-7f02261\">trenchless<\/strong> sections.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG3<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Roads, motorways, bridges, viaducts, railways<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the <strong class=\"cqop-v6-pannello-7f02261\">prevailing category<\/strong> in road and railway contracts; OS35 is needed to cross them without closing traffic.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS22<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Water treatment and purification plants<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">builds <strong class=\"cqop-v6-pannello-7f02261\">treatment plants<\/strong>; OS35 rehabilitates and connects the upstream sewer network.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS20-B<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Geognostic surveys<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">carries out the <strong class=\"cqop-v6-pannello-7f02261\">subsoil surveys<\/strong> required before a long drilling.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS14<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Waste disposal and recovery plants<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">handles the <strong class=\"cqop-v6-pannello-7f02261\">disposal<\/strong> of sludge and materials produced by rehabilitation works.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv61908 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os35_image4-en.webp\" alt=\"CIPP rehabilitation: a resin-impregnated fibre liner is cured inside the existing pipe, restoring its functionality and tightness\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">CIPP rehabilitation: a resin-impregnated fibre liner is cured inside the existing pipe, restoring its functionality and tightness<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-74a4c6d\">\n\n<div class=\"cqop-v6-titolo-sticky-1c8b9f9\">\n\n<h2 class=\"gb-text cqop-v6-titolo-ecc189a\">Why it pays to qualify in OS35<\/h2>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-71e1793\">\n<p class=\"gb-text cqop-v6-testo-3c2b5d5\">The <strong class=\"cqop-v6-pannello-7f02261\">OS35<\/strong> has two major waves of investment ahead of it:<br>\u00b7 widespread <strong class=\"cqop-v6-pannello-7f02261\">fibre optics<\/strong>, with the Italia 1 Giga, <strong class=\"cqop-v6-pannello-7f02261\">5G<\/strong>, Connected Schools and Connected Healthcare plans;<br>\u00b7 the <strong class=\"cqop-v6-pannello-7f02261\">rehabilitation of water and sewer networks<\/strong>, with 900 million just to reduce leaks from water mains.<\/p>\n\n\n\n<p class=\"gb-text cqop-category-conclusion-accent cqop-v6-testo-23dd753\">If you work with <strong class=\"cqop-v6-pannello-962ca18\">HDD, microtunnelling, CIPP, CCTV inspection or micro-trenching<\/strong>, <strong class=\"cqop-v6-pannello-962ca18\">OS35<\/strong> provides you with access to fibre-optic tenders and utility tenders for water networks.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-481eee7\" id=\"faq\">\n\n<div class=\"cqop-v6-griglia-28a732f\">\n\n<div>\n\n<h2 class=\"gb-text cqop-v6-titolo-2c72ce6\">SOA category OS35: frequently asked questions<\/h2>\n\n\n\n\n\n<div class=\"cqop-category-download cqop-category-download-minimal cqop-category-download-faq\">\n<a class=\"gb-text cqop-category-download-button\" href=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/schede-tecniche-soa-strutturate-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"Download PDF technical data sheets \u2014 opens in a new tab\">\n<svg role=\"presentation\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.7\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"><\/path><\/svg>\n\n\n<span class=\"gb-text\">Download PDF technical data sheets<\/span>\n<\/a>\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div>\n\n<div class=\"wp-block-essential-blocks-accordion cqop-faq-accordion  root-cqop-faq-96010-0\"><div class=\"eb-parent-wrapper eb-parent-cqop-faq-96010-0 \"><div class=\"eb-accordion-container cqop-faq-96010-0\" data-accordion-type=\"accordion\" data-tab-icon=\"\" data-expanded-icon=\"\" data-transition-duration=\"500\"><div class=\"eb-accordion-inner\">\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96010-0-1 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96010-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96010-0\"><h2 class=\"eb-accordion-title\">What is the official description of category OS35?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96010-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-f38d055 gb-text\">OS35 \u201cconcerns the construction and maintenance of any underground work using non-invasive excavation technologies. It includes, by way of example, guided and unguided horizontal drilling, with the possible reuse and exploitation of existing works, as well as the use of CCTV inspection, rehabilitation, renewal and replacement technologies for underground substructures or technologies for shallow mini-excavations.\u201d. The description was extended precisely to clarify that CIPP, CCTV inspection and shallow mini-excavations fall fully within the category.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96010-0-2 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96010-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96010-0\"><h2 class=\"eb-accordion-title\">What do \u201ctrenchless\u201d and \u201cno-dig\u201d mean?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96010-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">They are the international terms for technologies that build, replace or rehabilitate underground works without open-cut excavation.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96010-0-4 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96010-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96010-0\"><h2 class=\"eb-accordion-title\">What is the difference from OS21 and OG6?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96010-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">OS21 covers foundations, piles and consolidation. OG6 covers water and gas networks built with traditional excavation. OS35 covers underground works built without excavation.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96010-0-5 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96010-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96010-0\"><h2 class=\"eb-accordion-title\">What exactly is CIPP?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96010-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">A resin-impregnated fibre liner is inserted into the existing pipe and cured in place with steam, hot water or UV light. The result is a new pipe inside the old one.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96010-0-6 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96010-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96010-0\"><h2 class=\"eb-accordion-title\">Which works count as CEL for OS35?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96010-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">HDD drilling, microtunnelling, CIPP rehabilitation, slip-lining and pipe bursting, CCTV inspections, micro-trenching and robotic repairs.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96010-0-7 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96010-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96010-0\"><h2 class=\"eb-accordion-title\">Is there a licence for OS35 operators?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96010-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">Yes, for CIPP.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-5e842af\">\n\n<svg focusable=\"false\" role=\"presentation\" aria-hidden=\"true\" class=\"cqop-v6-icona-71ff866\">\n      <defs>\n        <pattern id=\"mattoniOS35\" width=\"72\" height=\"36\" patternUnits=\"userSpaceOnUse\">\n          <rect x=\"0\" y=\"2\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"36\" y=\"2\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"18\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"-18\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"54\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n        <\/pattern>\n      <\/defs>\n      <rect width=\"100%\" height=\"100%\" fill=\"url(#mattoniOS35)\"><\/rect>\n    <\/svg>\n\n\n\n\n\n<div class=\"cqop-v6-griglia-7a21026\">\n\n<div>\n\n<h2 class=\"gb-text cqop-v6-titolo-1522a9c\">Your next move?<\/h2>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-2d399db\"><strong class=\"cqop-v6-pannello-cff7b97\">Demonstrate your requirements<\/strong> and turn this knowledge into action: make sure you have the right SOA qualification and don\u2019t hesitate to invest in training and innovation.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-4cdb9ad\">\n\n<a class=\"gb-text cqop-v6-pulsante-5eba899 cqop-v6-state-f859560\" href=\"https:\/\/www.cqop.com\/en\/contacts\/\">Contact us<\/a>\n\n\n\n\n\n<a class=\"gb-text cqop-v6-pulsante-0678f05 cqop-v6-state-b958ab0\" href=\"https:\/\/www.cqop.com\/en\/online-services\/fee-and-requirements-calculation\/\">Calculate fees and requirements<\/a>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>OS35 Specialised works categories SOA category OS35 Low environmental impact works Requirement: Skilled workers holding the appropriate licence OS35 covers low environmental impact works: \u201ctrenchless\u201d or \u201cno-dig\u201d technologies that make it possible to lay, replace or rehabilitate pipes and cable ducts without digging trenches. It includes horizontal directional drilling (HDD), microtunnelling, pipe rehabilitation with CIPP, &#8230; <a title=\"SOA category OS35\" class=\"read-more\" href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/os35\/\" aria-label=\"Read more about SOA category OS35\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":920978,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_eb_attr":"","_eb_data_table":"","footnotes":""},"class_list":["post-920988","page","type-page","status-publish"],"acf":{"h1_seo":""},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/comments?post=920988"}],"version-history":[{"count":8,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920988\/revisions"}],"predecessor-version":[{"id":922322,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920988\/revisions\/922322"}],"up":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920978"}],"wp:attachment":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/media?parent=920988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}