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The vast majority of聽developments will require information on the makeup and behaviour of ground deposits and how the ground is,聽or is not, suitable for a proposed development scheme.聽This is聽required to support planning conditions and construction design on development聽sites and is carried out through intrusive ground investigations.

Traditionally, different site investigation techniques have tended to operate in isolation to each other.聽Such聽investigations can be costly and聽could even be聽required for many different reasons at various stages throughout the development process.聽Multi-purpose ground investigations are an efficient way around this, and聽considering what additional information developers could get from the ground during an investigation could reap rewards.

At聽SLR we see a benefit to each discipline,聽and the Client Team,聽being able to assess the ground, utilising a more integrated approach, to maximise the quality of information that we recover. With over 30 different technical discipline teams at SLR, we can implement an appropriate (positive minimum) level of site investigations, across an individual site, because we are utilising a minimum number of holes for different purposes.

Why should a developer client use聽a multi-purpose approach?

• It鈥檚 the best way to get maximum information from below ground with聽the聽least disturbance, all whilst聽minimising聽cost/spend.
• It will utilise the same intrusive works for multiple聽purposes.
• Information on below ground conditions is required to support development design and discharge planning conditions.
• Having an early 鈥渉eads up鈥� about likely ground constraints will help a client manage risks throughout the development process.
• Therefore, everyone is聽best聽placed to assess聽and聽establish costs聽and聽estimates as part of a client鈥檚 budget planning.

The following information is typically required by different technical disciplines and can be obtained as part of a multipurpose ground investigation:

• Land quality consultants聽鈥� extent and nature of made ground, natural ground strata, groundwater levels, samples of soil and groundwater for laboratory analysis, monitoring of groundwater and gas levels within wells.
• Geotechnical engineers聽- ground strength, samples for laboratory testing and groundwater levels, investigation of existing foundations.
• Archaeologists聽- assist with identifying different types and levels of made ground.
• Drainage engineers聽鈥� potential for infiltration drainage聽e.g.,聽soakaway tests.
• Ecologists聽鈥� identify potential for evidence of protected terrestrial species聽e.g.,聽ecologist to complete a聽fingertip聽search and flag to client.

What are the benefits聽for the client?

• Early discussion with specialists can support the investigation strategy聽e.g.,聽type of hole, its location, depth, logging requirements and testing.
• Boreholes, window sampler holes, trial pits and trenches can be used to assess ground conditions and installation of monitoring wells can be used to assess groundwater and soil gas conditions.
• Groundwork鈥檚聽contractor costs are typically over 50% of the intrusive investigation costs so it makes sense to get the most information out of each hole/intrusion.
• It allows the site to be assessed quickly,聽rather than waiting for each discipline to take their turns with digging 鈥榥ew holes鈥�.
• Design options may be considered earlier in the design process聽with the knowledge of聽risks/issues raised by different disciplines.

Examples include:

• At a former wharf site on the River Lee,聽the archaeologists were required to complete intrusive investigations to uncover potential former wharf features, however health and safety constraints associated with trial trenching in contaminated soils restricted their investigations.鈥疘nstead,聽they advised on locations of proposed window sampler holes being undertaken for land quality assessment purposes, observed the cores recovered,聽and reviewed the logs to demonstrate that no further archaeological assessment was required.
• An archaeology assessment聽required to support a planning condition聽in a marshy area enabled land quality consultants to identify the extent of made ground and advise on potential waste management options,聽without additional investigations and cost duplication聽at a later date.
• The strategic location of聽trial pits聽and boreholes, including monitoring wells, on a proposed residential development site enabled land quality sampling and assessment, soakaway testing for drainage design,聽and geotechnical testing for foundation design.聽This ensured early assumptions about site drainage and foundation design could be confirmed while completing an investigation required to obtain planning permission.
• On a residential development,聽site investigations in the form of window samples and small test pits were useful for archaeological purposes in assessing the levels of made ground in relation to natural.聽Although site investigations do not replace formal archaeological trenching,聽the information from the site investigations provides an indication of the levels that potential archaeology surfaces may occur.聽This information can be considered as part of the formal Desk Based Assessment for archaeology.

Why SLR?

With over 30 technical discipline teams at SLR, we have the required skills and experience to undertake the task. Our multi-disciplinary teams allow us to offer a whole suite of services together, as well as the flexibility to tailor a team specifically for your project.

By working collaboratively, we know more about the site at an early stage, which is highly beneficial when consulting with stakeholders.聽So next time you are considering聽conducting聽a ground investigation,聽stop and consider if you can get any additional useful information from your hole in the ground.