This is a series of articles by Brandon Elkins on the NRCS Web Soil Survey and how to use it.  This will be helpful with your subdivision review applications.

What Is Web Soil Survey-How Can It Be a Benefit to you

How Soil Surveys are Made-Past Present Future

First Steps In Using Web Soil Survey-Handy Tools and Establishing and area of interest

Second Steps in using Web Soil survey-soil map and soil data explorer

Final steps in using web soil survey