Considering Cumulative Effects
   Guidance on environmental impact assessment, from U.S. Council on Environmental Quality that is outlined in the National Environmental Policy Act. In PDF format.
   http://ceq.eh.doe.gov/nepa/ccenepa/ccenepa.htm

Office of Enforcement and Compliance Assurance
   Ensures compliance with the nation's environmental laws by employing an integrated approach of assistance, incentives and innovative civil and criminal enforcement.
   http://www.epa.gov/compliance/