A phase 1 desk study should always precede any ground investigation. Ideally, it should also be accompanied by a walkover survey conducted by an experienced practitioner. By compiling available information in relation to a site’s environmental, geological, hydrogeological, hydrological and mining setting a cost-effective and focussed site investigation will be developed. See More:- https://www.earthenvironmental.co.uk/phase-1-desk-study/