6 July 2023
Project: Halstead, Essex
Size: 55 new homes
Disciplines working on the project:
About the project:
Orchestra Land commissioned M-EC to provide a range of technical services for an outline planning application for a 55-dwelling site in Halstead, Essex. The services included transport, flood risk and drainage, utilities, geo-environmental, acoustics, air quality, and structures. Working closely with the client and external bodies, M-EC ensured a fully encompassed approach, supporting the application to successfully achieve outline planning approval.
The geo-environmental team conducted a phase I desk study, identifying low to moderate contamination risk on the site, primarily from former ponds and surrounding areas. A phase II ground investigation was recommended to further assess the impact of contamination, ground conditions, feasibility of drainage, and geotechnical properties.
Building upon the insights gained from the phase II investigations, the skilled structures team at M-EC meticulously devised a foundation zoning plan. By incorporating the results into the proposed site layout, they discerned the specific measures necessary for each home. This comprehensive analysis led to the identification of specific properties that would require either piles or strip footings, ensuring a solid foundation for the future dwellings.
Recognising the importance of environmental sustainability, a flood risk assessment became an integral part of the planning process. The assessment indicated that the development was located in flood zone 1 with a minimal probability of river flooding. The risk of flooding from surface water and other sources was also deemed very low. Following soakage testing, it was concluded that shallow soakage was not a viable option. Instead, a proposed detention basin, discharging into the existing surface water network within Mount Hill, emerged as the ideal solution for managing surface water discharge.
As part of the application, M-EC was also responsible for providing a comprehensive Transport assessment. Their meticulous analysis sought to accurately gauge the potential impact of the proposed development on the local highway network and the surrounding area. The analysis revealed that the development would result in approximately 73 two-way vehicle movements during the morning peak hours and 72 two-way movements during the evening peak hours. Considering the convenient access to walking and cycling routes, the team concluded that there would be no significant negative impact on the existing highway network. This approach ensures the seamless integration of the development into the surrounding infrastructure, promoting accessibility and convenience for all residents.
Moreover, the team provided an access statement and vehicle tracking analysis for refuse and fire vehicles. These measures were put in place to ensure that the proposed layout would not only enhance the development itself but also prioritise safety and functionality for the benefit of all residents. This comprehensive approach showcases the meticulous planning and commitment to a well-designed and harmonious development.
Environmental considerations played a vital role in shaping the project, leading to the undertaking of acoustic and air quality assessments. The team meticulously evaluated the potential environmental impact of the development. Air quality objectives were established, and an assessment of exposure was conducted in collaboration with the EHO (Environmental Health Officer). This assessment focused on examining the impact of traffic-related emissions from the proposed development on existing and future sensitive receptors. The findings indicated that the traffic generated by the development would be minimal and insignificant, assuring that the air quality at the proposed site was suitable for development. To encourage sustainable travel practices, the team proposed mitigation measures, such as residential travel packs and the inclusion of electric vehicle charging infrastructure, aimed at promoting greener transportation options.
To adhere to the ProPG guidelines, an initial site noise risk assessment was carried out, utilising advanced Cadna-A noise modelling software due to the challenging circumstances presented by the Covid-19 pandemic. The assessment and modelling efforts revealed specific areas within the development where mitigation measures would be necessary to meet recommended sound-level criteria, both internally and externally. These measures included thoughtful considerations for the layout, strategic placement of acoustic screening in designated gardens, installation of an acoustically sound barrier along the southern boundary, and the selection of glazing systems, acoustically attenuated ventilation, and building materials with effective sound reduction properties.
Completing the comprehensive technical evaluation of this development, the utilities team conducted a thorough assessment to determine the available capacity, potential requirements for diversions, necessary easements, and budget costs for service locations. Collaboration with Anglian Water was instrumental in assessing the capacity for treating foul waste from the development, ensuring the nearest water recycling centre could handle the additional load. In terms of gas capacity, no reinforcement costs were anticipated, while the installation of a new substation and the diversion of overhead cables were necessary to accommodate the electricity demands, including provisions for air source heat pumps and electric vehicles. These measures reflect a forward-thinking approach that futureproofs the development and aligns with sustainable practices. Budget costs for these utilities-related works were diligently compiled, providing a comprehensive overview of the financial requirements.
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