As stated in , further investigation and/or coordination may be necessary to confirm the presence or absence of contamination and to determine the extent and severity, appropriate methodology, and preliminary costs of corrective or preventive action. Sites under investigation, corrective action, enforcement, permit plans and/or closure plans regulated by either EPA or TCEQ will require early coordination to determine site status, obtain approval for intrusive sampling and analysis plans, and determine design considerations that might be needed during construction. Coordination may occur with both the applicable regulatory agency(s) and the responsible property owner or operator of the site.

When appropriate, assistance from appropriate state and federal regulatory agencies should be sought to minimize involvement. Requests for assistance or coordination with federal, state and local agencies to assess the degree of contamination, scope of treatment and disposal measures should also be considered, initiated and documented during advanced planning and subsequent stages of project development. Coordination with regulatory agencies, property owners or local agencies may take place concurrently with project development.