G.2.3 Simple Subsurface Investigation

Refer to Table II-5.4 to determine the minimum subsurface investigation requirements for a project. The Simple Subsurface Investigation is conducted approximately 5 feet from the test hole.

A simple subsurface investigation report can be used to document the investigation and testing results. This report should include the following:

• Map of investigation and testing.

• Soil characteristics.

• Depth to groundwater (if encountered).

Table G.1. Simple Subsurface Investigation Elements.

Minimum Investigation Depth and Vertical Separation Requirements All BMPS
Season	Minimum Investigation Depth (feet)a	Minimum Vertical Separation, fta
		Groundwater	Hydraulically- Restrictive Layer
Wet Season (November – March)	2	1	1
Dry Season (April – October)	3	2	1
Soil Characteristics Type and texture of soil
Notes: The minimum investigation depth and vertical separation shall be measured from the bottom of the BMP. The bottom of the BMP is defined as the deepest portion of proposed BMP where infiltrating water is expected to move into the underlying soil.