Periodic updates are required to stay consistent with soil and landform related references, e.g.
G. Each application under § 32.1-163.6 of the Code of Virginia shall include a site and soil characterization report using the Field Book for Describing and Sampling Soils, Version 2.0, National Soil Survey Center, Natural Resources Conservation Service, U.S. Department of Agriculture, September 2002.Version 3.0 National Soil Survey Center, Natural Resources Conservtion Service September 2012. The report may contain such information that the designer deems appropriate; however, it must describe the following minimum attributes of the site of the proposed soil treatment area: 1. Depth to limiting features, seasonal or perched water tables, pans, restrictions, or pervious or impervious bedrock; 2. Slope of the project area;Surface Morphometry 3. Ksat or percolation rate at the proposed installation depth and at depths below the soil treatment area to demonstrate compliance with this chapter. Ksat or percolation rate may be estimated for small AOSSs. The Ksat or percolation rate must be measured using an appropriate device for all AOSE's large AOSSs;