PS1558B Various Sites-Geotechnical investigation-Consultant, ECS - Illinois, LLC Project #00000 Contract PDF: Geotechnical Services – Program Wide Other Documents: Amendment 1 – Geotechnical Services Amendment 2 – Geotechnical Services Amendment 3 – Geotechnical Services Amendment 4 – Geotechnical Services Awarded to: ECS Midwest, LLC Board Approval Date: 05/05/2010