What is a Phase 2 Intrusive Site Investigation?
A Phase 2 Intrusive Site Investigation is needed whenever a Phase 1 Preliminary Risk Assessment determines that there are contamination risks at a site that need further investigation in order to quantify the risk. A Phase 2 Intrusive Site Investigation will include soil sampling and analysis in a UKAS accredited laboratory and is essential in order to determine whether contamination is present.Get In Touch
What is a Phase 2 Intrusive Site Investigation?
The Basics - After first carrying out a Phase 1 Preliminary Risk Assessment, a Phase 2 Intrusive Site Investigation is the next stage in the assessment of potentially contaminated land. If a Phase 1 Risk Assessment shows that a site is potentially contaminated, a Phase 2 Intrusive Site Investigation must be done.
Where the Desktop Study identifies potential contamination a Detailed Investigation Report will also be required, including a site investigation documenting the characteristics of the ground, an evaluation of all potential sources of contamination and a risk assessment, together with an updated conceptual model. – Example condition from Rushcliffe Borough Council
The Phases & Ways to Save Money - The Phase 2 Intrusive Site Investigation will build on the findings of the first phase with an aim to confirm whether any suspected contamination is present. It's important to use a phased process in these kinds of assessments as it allows us to focus attention on particular areas of potential contamination and save time and money through a more efficient sampling strategy. It also allows us to ensure that the appropriate laboratory testing is carried out on samples to save money by avoiding unnecessary tests and also making sure the right contaminants are tested for so important elements aren't missed out. Throughout the Phase 2 Intrusive Site Investigation the 'Conceptual Site Model' (CSM) will be updated as new sources or pathways of contamination are identified.
What's Included in a Phase 2 Intrusive Site Investigation?
Sampling Strategies & Site Visit - A Phase 2 Intrusive Site Investigation will involve planning a sampling strategy for collecting soil samples from a site taking into account any potential sources of contamination identified through the Phase 1 assessment. For example, if hazardous substances are stored on a site it will be important to take samples from this area to identify any resulting contamination of the land. At this stage of a Phase 2 Intrusive Site Investigation the location and depths of sample will be determined along with the method of taking them. For example, for a site intended for redevelopment into residential land it will likely be important to sample shallow soils as this is an important pathway of contamination that may affect the future residents and this can usually be done with a handheld window sampler.
Once the sampling strategy for the Intrusive Site Investigation has been planned, samples will be taken from site. It may be the case that unforeseen constraints limit the sampling and the sampling carried out may differ from the original strategy. The limitations will be noted in the report but will rarely invalidate an investigation entirely.
UKAS accredited laboratory testing - After samples are collected they are sent to a UKAS accredited laboratory for analysis that will usually include testing for heavy metals and hydrocarbons but will be specific to every Site Investigation. For example, on some sites, it's important to test for the presence of asbestos. Once the laboratory testing is complete, the results will be assessed with reference to industry standard screening values that act as threshold values for determining if a site can be considered 'uncontaminated'.
Why Do I Need a Phase 2 Intrusive Site Investigation?
It's not possible to determine actual contamination levels present at a site without carrying out an Intrusive Site Investigation. Desk studies can only identify potential sources of contamination and without collecting and testing soil samples, actual contamination levels cannot be identified. UK legislation dictates that the land contamination risk assessment process is an integral part of any development project and if a Phase 1 Risk Assessment for a development identifies the need for further investigation, no development will be allowed until an Intrusive Site Investigation is carried out. Carrying out a Phase 2 Intrusive Site Investigation may also allow you to avoid the need for expensive and timely remediation work as it can show that land is below the threshold values that determines whether remedial work is required.
How Do I Get a Phase 2 Intrusive Site Investigation? - We can carry out Phase 2 Intrusive Site Investigations for a range of construction projects on greenfield and brownfield land.
1. Contact us and let us know your requirements
2. Following initial consultation we can provide an outline proposal detailing how we can help and the costs involved
3. Our environmental consultants will then carry out a Phase 2 Intrusive Site Investigation including sampling work and laboratory analysis
4. We can turnaround our Phase 2 Intrusive Site Investigation within days of your initial enquiry allowing you to stick to schedules and minimise any disruption to your project