Ground Gas Desk Study
Phase 1 Ground Gas Desk Study for redevelopment of a residential property
Following submission of a Planning Application, the Local Authority expressed concern about a former quarry being a potential source of ground gas which could impact the proposed development. SWG undertook a Phase 1 contamination desk study and walkover survey to assist with planning conditions to and to produce a Conceptual Model of the site and identify the Source-Pathway-Receptor linkages between the quarry (source) and the proposed dwelling (receptor).
The old quarries and associated pond located 25m south west of the site have been backfilled, in part, therefore, these features presented a theoretical source of ground gas. It was determined that as the quarries are not capped, any gasses generated would vent to the atmosphere rather than migrating laterally through the ground towards the development site. SWG argued that the use of modern construction techniques and a damp proof membrane with good sealing around pipes and floor structure will provide inherent gas protection measures. The desk study was accepted by the Local Authority and relevant warranty providers, subsequently planning was granted, saving the Client time and money.