Geology and soils

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Baseline

The proposed scheme runs along an asymmetrical valley that separates the two sides of Crickley Hill and Barrow Wake Sites of Special Scientific Interest (SSSI), which is a designated geological site. The Cotswold escarpment dominates the regional landscape. An extensive plateau exists above the escarpment, underlain by limestone, which was historically quarried across Crickley Hill and Leckhampton Hill. The proposed scheme passes through an area of relict landslide deposits around Brockworth bypass and Crickley Hill. Agricultural land includes areas classified as best and most versatile land. A number of possible sources of contamination have been identified.

Construction

The proposed scheme would not directly affect the existing geological exposures within the Crickley Hill and Barrow Wake SSSI therefore would not result in any impact on the geological importance of the SSSI. New geological exposures would be created within the highway cuttings.

The construction of the proposed scheme would affect approximately 20ha of best and most versatile agricultural land. It also has the potential for adverse impacts related to contaminated materials that may be present in the ground. Construction activity could result in the mobilisation of contaminants and the generation of contaminant transport pathways from site activities.

The findings from the ongoing and historical ground investigations have been used to inform options for appropriate mitigation. A management plan would be produced, detailing mitigation measures to limit or completely remove these effects and ensure adverse effects are reduced as far as possible.

Preliminary construction assessment

• Likely permanent adverse significant effect on best and most versatile agricultural land.
• Likely permanent adverse significant effect on water as a result of identified soil and groundwater contamination. Mitigation is to be developed to reduce the impact.

Operation

Operation of the proposed scheme would not include any activities that are likely to have an impact on geology and soils.

Preliminary operation assessment

• No likely significant effects are anticipated during the operation of the proposed scheme.