SEPA checklist guidance, Section B: Groundwater

We provide guidance to help applicants complete the Groundwater subsection of the Section B: 3. Water section of the SEPA environmental checklist.

3b. Groundwater

b. Groundwater

1. Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses and approximate quantities withdrawn from the well? Will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known.

Describe any new or increased groundwater extractions, including use or purpose and approximate quantities if known. For water discharges to ground, remember to consider how stormwater runoff collected from impervious surfaces is managed onsite. The water resources web map may be a helpful tool.
2. Describe waste material that will be discharged into the ground from septic tanks or other sources, if any.

“Waste material” includes chemicals, sediments, agricultural (pesticides, herbicides, and fertilizer) runoff, wash water, logging slash, log booming or storage debris, treated wood pilings, oil or other fuels from equipment used for construction and/or operational activities.

Septic systems are a primary source of waste discharges to ground, but unlined ponds or trenches used for discharge or storage of liquid waste (liquid manure, food processing waste, contaminated waters, etc.) should also be considered.  Remember to include size/quantities and to describe the nature/characteristics of the waste to the degree known.  

Include discharges to injection wells, if applicable. Injection wells are wells in which water or other fluids are injected back into the ground. Injection may be directly into a groundwater aquifer or into unsaturated substrate overlying an aquifer. Mention any unlined ponds or trenches that store or discharge waste.  Include size and/or quantities, and the type of waste if known. If the project is located above a sole source aquifer, that needs to be mentioned.

Additional Resources: c. Water runoff (including stormwater)

1. Describe the sources of runoff and method of collection and disposal, if any.

Describe the following: source runoff; intended management systems; where and how the runoff will be discharged off the project site; and where and how the runoff will flow to ground or surface waters.
  • For Forest Practice proposals this may include road-cut slopes with the water being collected in the ditches with cross drains placing the water on the forest floor away from flowing streams. Skid trails, water bars, or silt traps would be other sources of water collection. The runoff may be caused by both  ground-based and/or cable logging equipment.

  • For Surface Mining proposals or mining expansions, include the pre and post mining configuration of water bodies. Please note any new surface water locations that stormwater runoff might enter due to expanded mining activity. For projects involving underground drilling include the water control plan for the drill pad and slurry pond.
2. Could waste materials enter ground or surface waters?

In considering whether waste could be carried to ground or surface waters, consider potential sources of contamination (such as parking lots, equipment storage, agricultural practices, lawn and landscaping maintenance, animal waste, treated wood, eroding soils, etc.), any treatment provided, and where the runoff will flow or be discharged. Describe the type/source of potential contamination and the water body or aquifer it is likely to end up in.
3. Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe?

Identify any effects the proposal would have on drainage patterns, including effects on existing groundwater resources.
d. Proposed measures to reduce or control surface, ground, runoff water, and drainage pattern impacts, if any.

Provide a description of the measures to avoid, minimize or counter adverse environmental impacts to groundwater from discharges, surface runoff, drainage patterns.