Rank: Forum user 
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I was told today that we may need to excavate a trench on site to a depth of 'around' 2m due to a water leak. Obviously we'll be looking to contractors to submit risk assessments etc before commencing work if it turns out to be necessary but I could do with reading up on the best way to plan such works.
I would say its a given that a 2m excavation is going to require supporting and that the spoil, equipment etc should be over 1m away from the excavation but where can I read up some more?
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Rank: Forum user
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Refer to service drawings / scan for services, Excavator with competent operator (watch out for quick hitch pins - training required), spoil approx 1.5 times the depth of the excavation (3 meters), suitable shoring (trench box, drag box, sheet piles, batter back etc.), suitable access, monitor and inspect trench support (written record every 7 days), back filling, barriers, movement of plant and equipment etc. trench support and working around plant are the main hazards in my experience. http://www.county-safety...ices.com/_docs/cis08.pdf
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Rank: Super forum user 
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At the risk of being a grumpy old s*d (GOS) again, could I suggest that there is a pretty good free resource called the HSE website that might be worth a look?! Searchable as well! Try http://www.hse.gov.uk/pubns/priced/hsg150.pdf
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Rank: Forum user
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Rank: Forum user
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Thanks, I'll give it a read. To be honest Im suprised there isnt more available from the HSE, particularly in light of the recent manslaughter case. There used to be CIS 8 and a HSG but they both seem to have been pulled.
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Rank: Forum user
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Jason, to help.
It will depend on the location, soil structure and time.
Will the excavation be a confined space? permit required ? gas testing for CO etc if near a main road or running machinery.
Shoring can be avoided with benching and stepping, hard barricades should be used and signs and notices engaged. Lighting if left over night as an open excavation etc need to be considered.
Access and egress depending on the length of excavation.
Wizard
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Rank: Super forum user
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Jason
Excavated materials when stored at the side of an excavation should be equal to the depth, so 2 mts deep will require 2mts away. Benching and stepping should take into account the soil conditions that are present, loose soil will require greater angle than chalk. Also you will need to take account of any under ground services that may be present, so if stepping or battering then more support for these would be required
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Rank: Forum user
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If we have to do it, its going to be located in the yard area on site. This means excavation through the concrete top layer before reaching the ground beneath. Unsure of soil type/condition though probably sandy clay given the rest of the site. Therefore its probably going to be necessary for geo survey.
Unfortunately banking or stepping wont be possible as it would basically mean digging up most of the yard. Therefore they would like to do vertical walls and a trench box to support. First estimate dimensions are 3-4' wide x 10' length and 2m depth.
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Rank: Super forum user
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Jason
Get your contractor to tell you how they are going to carry out the task. When they explain how, question what you are not sure about. GE 700 CITB publication would give you a good start, each ground opening exercise is different, but the same.
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Rank: Forum user
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I am sure that you can still get HSG 185 "Health Safety in Excavations".
Les
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Rank: New forum user
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JasonMcQueen wrote:I was told today that we may need to excavate a trench on site to a depth of 'around' 2m due to a water leak. Obviously we'll be looking to contractors to submit risk assessments etc before commencing work if it turns out to be necessary but I could do with reading up on the best way to plan such works.
I would say its a given that a 2m excavation is going to require supporting and that the spoil, equipment etc should be over 1m away from the excavation but where can I read up some more? Hi, Please have a look on this file http://www.constructions...xcavatingandShoring.pdf, this may help you. I suggest you have to ask your contractor to have prof engineer to design the shoring as the water leakage may compromise the soil stability. Better be safe than sorry mate! Cheers JTC
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