NRCS Web Soil Survey: Gather Site Soil Info for Free
Any ecological landscape design must take the soils into consideration. This includes the mineral makeup and underlying bedrock to determine subsoil types. These will help start a rough outline for addressing specific areas to test with percolation, soil analysis, and composition.
Web Soil Survey: Useful, free government tool for soil and other data analysis
The National Resources Conservation Service (NRCS) has a free online tool for analyzing your site's data. The free PDF that they provide at the end of your survey includes a to scale site map that you can then import into your designs. It helps shave a bit of time off my homework before we do a site assessment (that video to come). Here is a walk through using the NRCS's Web Soil Survey. If you have other tricks using the NRCS's online tool, let me know and I can include it in future edits.