The first allows users to view 12,500 pages of previously unavailable historical trade directories.
Using data compiled from Kelly's, Pigot's, White's, Slater's and the Post Office, the Landmark Library contains occupier and trade details of potentially contaminative practices.
The company says consultants will be able to browse, review and download non geo-rectified information and images, and filter searches so they are street or trade-specific.
The second tool is the Envirocheck Mining and Ground Stability report, which can access over 1.8M coal and non-coal mining and other ground stability data for use with contaminated land appraisals, ground investigations, remediation planning and foundation design.
The report brings together sources including Landmark's land use database, mining and instability data from Arup, natural and mining cavities data from Peter Brett Associates and six Geosure data sets from the British Geological Society.
The report allows consultants to access private archives, such as Wardell Armstrong's brine pumping data for Staffordshire and Droitwich, brine compensation areas and possible non-coal mining areas. It also identifies man-made features such as kilns, air raid shelters, sewers and military defences by drawing on information from the Subterranea Britannica society.
David Mole, Landmark Environment managing director, said: "It is crucial that consultants have access to accurate and detailed information to conduct effective site assessments."