The Ground & Water Approach – Ground and Water attended the site and following well installation, undertook continuous groundwater monitoring using a data logger at 15-minute intervals during August and September 2019. This was combined with a site investigation and spot monitoring data obtained between December 2018 and February 2019. The monitoring data was combined within precipitation data to determine the impact of wet periods on the underlying groundwater level.
Based on the site investigation and monitoring data obtained, it was clear there was a quick groundwater level reaction to periods of precipitation. However, it was considered that the only part of the proposed development, would have any impact on the flow of groundwater. This related to the use of ground beams, which would only have impacted flow during times of peak groundwater levels.
The Outcome – The proposed solution was to reduce the area of the site with a hardstanding covering, as well as the removal of previously existing underground structures during the demolition process. These measures were considered likely to aid the flow of groundwater onsite. Overall, it was considered that this will outweigh the negative impact of the proposed ground beams. The suggested mitigations were accepted and satisfactory for the planning conditions imposed.