Phase 2 Site Investigation for MEMs Power Generation, Gillingham

Lustre Consulting was appointed by WW Martin to conduct an environmental site assessments for the redevelopment of a site located within the Beechings Way Industrial Centre in Gillingham, Kent. The project involved the demolition of an existing industrial warehouse and the construction of the new MEMS Power Generation Headquarters.

Given the site’s industrial history, there was an increased risk of (historic) ground contamination affecting the neighbouring residential areas. To evaluate the contaminated land risks, both an initial Phase 1 Desk Study and the subsequent intrusive Phase 2 Site Investigation were undertaken by Lustre Consulting. These contaminated land survey reports were also required to discharge a planning condition and ensure compliance with UK and local environmental standards. 

Phase 1 Desk Study

The Phase 1 Desk Study evaluate potential contamination risks based on the site’s history and environmental setting. This comprehensive desk-based assessment included:

• Historical Land Use Review: This included review of mapping records dating as far back as 1869, as well as environmentally pertinent historic use of the site and the immediate surroundings. The site’s previous use as a warehouse and its industrial surroundings raised concerns about possible contamination, such as hydrocarbons, heavy metals, and solvents in the shallow soils.
  
• Environmental and Geological Data Analysis: The analysis highlighted the site’s geological composition, including permeable strata (such as sand or gravel), which allow water and liquids to flow through easily. This posed a potential risk to groundwater contamination, as these layers can create pathways for pollutants to travel into groundwater, potentially impacting nearby water supplies and ecosystems. This increased the importance of addressing contamination risks thoroughly.

Phase 2 Site Investigation

This phase involved: The Phase 1 desktop survey report concluded that an intrusive Phase 2 Site Investigation was necessary to determine the contaminative status of the shallow soils and provide the information required to discharge the planning condition imposed by Medway Council. This phase of the site investigation work involved: 

• Soil Sampling and Analysis: Trial pits and boreholes were excavated across the site to collect representative soil samples, which were tested for potential contaminants, including hydrocarbons, heavy metals, and polycyclic aromatic hydrocarbons.
• Groundwater Monitoring: Monitoring wells were installed to assess groundwater quality and identify potential contamination from past industrial activities. This was particularly important given the site’s permeable geology and proximity to sensitive receptors.
• Ground Gas Assessment: Gas monitoring was conducted to evaluate risks associated with ground gases, such as methane and carbon dioxide, which could impact the proposed development and future users of the site.

The insights from these land contaminated investigations allowed Lustre Consulting to demonstrate compliance with environmental standards, supporting MEMs Power Generation’s planning application to Medway Council. The reports provided the essential data to move forward with the project safely and compliantly, ultimately leading to approval for the site redevelopment.

Key Findings and Recommendations

The Phase 2 Site Investigation confirmed the presence of low-level contaminants in the shallow soils, likely resulting from the site’s industrial past. Although no immediate risks were identified that would prohibit development, the following measures were recommended:

1. Targeted Ground Remediation: Contaminated soils in specific areas were recommended for removal or treatment to ensure compliance with environmental standards.
2. Ground Gas Mitigation: Installation of a gas protection system to safeguard the future building against potential ingress of harmful gases.
3. Foundation Design Considerations: Recommendations for construction methods that would minimise the risk of disturbing any residual contamination, ensuring both structural integrity and environmental safety.

Outcome

The results of the Phase 2 Site Investigation, combined with the findings from the Phase 1 Desk Study, were compiled into a detailed site investigation report and submitted to the local planning authority. This report provided the necessary assurances to discharge the planning condition and allowed the project to proceed to the construction phase.

Lustre Consulting’s work ensured that MEMs Power Generation could move forward with their redevelopment plans in a safe and compliant manner. The project not only addressed environmental concerns but also contributed to the revitalisation of the site, paving the way for a modern warehouse and office space.

For more information on how Lustre Consulting can support your project with geoenvironmental and geotechnical solutions, please contact us today.