Hi All, This is my first post. I am a landscape designer and currently have a job where we have been able to use a standard survey to create a Digital Terrain Model (DTM). We have been also able to gather a survey of where the sandstone is below the soil level on the site. My question is, is there a way to map subsoil profiles such as a bedrock layer so that I can do a rough estimate on how much soil vs sandstone will need to be excavated. This is critical to this job as the client is adamant about the budget and need to assist the contractor in quoting for excavation. It will also be useful to plan for any stone that we want to be exposed. Hope you guys can help.