Phase 1 Site Investigation Report


Phase 1 Site Investigation, also known as Preliminary Risk Assessment through Desk Studies, serves as a fundamental component in the overall site investigation process. Its primary objective is to develop a preliminary Conceptual Site Model (CSM) to pinpoint potential pollutant linkages.

Subsequently, the CSM undergoes refinement, leading to the formulation of conclusions and recommendations.

Phase 1 Site Investigation Report
for planning in
London & Elsewhere

How do we carry out
Phase 1 Site Investigation Report?

The desk study process involves compiling site-specific data and information, encompassing aspects such as geology, hydrogeology, hydrology, site history, mining and quarrying activities, landfill and waste management, and regulatory concerns raised by entities like the Local Authority and the Environment Agency. This comprehensive approach enables our team of Environmental Consultants to construct a detailed environmental profile of the site. Through this process, potential contamination sources, pathways, receptors, and the interconnection of these elements, known as ‘pollutant linkage,’ are identified. The presence of all three components is crucial for the existence of a pollutant linkage. If confirmed, further investigation is recommended, as detailed in our Phase 2 Site Investigations page.

Additionally, our Phase 1 Site Investigations extend to assessing the anticipated ground conditions beneath proposed structures for geotechnical considerations.

Why do you need an Phase 1 Site Investigation Report?

Following the guidelines outlined in the Land Contamination Risk Management (LCRM – Formerly CLR11), Guiding Principles for Land Contamination (GPLC) 1-3, and the National Planning Policy Framework (NPPF), it is stated that:

“Applicants are required to submit, at a minimum, a Preliminary Risk Assessment and site reconnaissance (walk-over). In certain cases, this may suffice to establish a conceptual model of contamination sources, potential pathways to vulnerable receptors, and methods to break identified pollutant linkages. In instances of proposed development, the responsibility falls on the developer to ensure that the development is safe and suitable for its intended purpose. The developer is tasked with determining the suitability of the land for a specific development or if it can be made suitable through remedial actions.”

The breakdown of Phase 1 Site Investigation Report

1. Phase 1 site investigations for projects involving contaminated land are becoming increasingly prevalent due to the growing legislative requirements during the planning stages. For all new developments, including full new builds, rebuilds, or extensions, a Phase 1 Site Investigation is now a mandatory minimum. Additionally, if necessary, a Phase II Site Investigation is strongly recommended.

2. Purple Energy conducts research and gathers information from external sources, including Landmark Envirocheck, Groundsure, Local Authorities, The Environment Agency, The Coal Authority, and the British Geological Survey. This data compilation aims to gather comprehensive details about a specific site, forming a detailed profile. The objective is to assess the site’s suitability for use, ascertain the need for a Phase 2 Site Investigation, and, if necessary, formulate a comprehensive plan for a ‘Targeted’ Site Investigation.

3. Phase 1 Site Investigations are also generated for geotechnical projects, where the necessity may not be mandated by legislation but arises from the need to pinpoint potential ground conditions and strata types at a site. This information is crucial for the accurate design of a comprehensive geotechnical site investigation. Early identification of both topographic and subsurface ground conditions can illuminate the need for and selection of specific investigation techniques. These may include the use of bog mats, low bearing pressure excavators, or restricted access machinery, as well as a choice of drilling methods such as air flush, air mist, or water flush, among others.

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