CONCRETE TUNNEL FOR A RAPID TRANSIT TRAIN

WELLS FARGO BANK, NATIONAL ASSOCIATION, AS AGENT

from CONTECH ENGINEERED SOLUTIONS INC.

SECURITY INTEREST Recorded 2016-12-08

CONTECH ENGINEERED SOLUTIONS, LLC

from GOLDMAN SACHS LENDING PARTNERS, LLC

RELEASE OF SECURITY INTEREST Recorded 2016-12-02

CONTECH BRIDGE SOLUTIONS, LLC

from WELLS FARGO CAPITAL FINANCE, LLC

RELEASE OF SECURITY INTEREST Recorded 2016-12-02

CONTECH TECHNOLOGIES, INC

from GOLDMAN SACHS LENDING PARTNERS, LLC

RELEASE OF SECURITY INTEREST Recorded 2016-11-30

CONTECH ENGINEERED SOLUTIONS LLC (F/K/A CONTECH CONSTRUCTION PRODUCTS INC.), KEYSTONE RETAINING WALL SYSTEMS LLC (F/K/A KEYSTONE RETAINING WALL SYSTEMS INC.), CONTECH TRUCKING & LOGISTICS, LLC

from WELLS FARGO BANK, NATIONAL ASSOCIATION

RELEASE OF SECURITY INTEREST Recorded 2013-08-07

GOLDMAN SACHS LENDING PARTNERS LLC

from CONTECH ENGINEERED SOLUTIONS LLC, IMBRIUM SYSTEMS LLC, KEYSTONE RETAINING WALL SYSTEMS LLC

NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Recorded 2013-06-18

CONTECH ENGINEERED SOLUTIONS LLC

from CONTECH BRIDGE SOLUTIONS LLC

MERGER Recorded 2012-08-07

WELLS FARGO CAPITAL FINANCE, LLC

from CDS TECHNOLOGIES LLC, CONTECH BRIDGE SOLUTIONS LLC, CONTECH EARTH STABILIZATION SOLUTIONS LLC, CONTECH ENGINEERED SOLUTIONS LLC, CONTECH STORMWATER SOLUTIONS LLC, KEYSTONE RETAINING WALL SYSTEMS LLC

SECURITY INTEREST Recorded 2012-02-21

CONTECH BRIDGE SOLUTIONS LLC

from CONTECH BRIDGE SOLUTIONS INC.

CERTIFICATE OF CONVERSION Recorded 2012-02-03

CONTECH BRIDGE SOLUTIONS INC.

from CONTECH ARCH TECHNOLOGIES, INC.

CHANGE OF NAME Recorded 2012-01-04

WELLS FARGO BANK, N.A.

from ALLIANCE CONSTRUCTION PRODUCTS INC., ARMORTEC, LLC, CDS TECHNOLOGIES, INC., CONTECH BRIDGE SOLUTIONS INC., CONTECH CONSTRUCTION PRODUCTS, INC., CONTECH EARCH STABILIZATION SOLUTIONS INC., CONTECH STORMWATER SOLUTIONS INC., CONTECH TECHNOLOGIES, LLC, CONTECH TRUCKING & LOGISTICS, LLC, KEYSTONE RETAINING WALL SYSTEMS, INC., SAFETY PRECAST, INC., SUPERIOR DRAINAGE, LLC, THOMPSON CULVERT COMPANY, WEST TEXAS CULVERTS, INC.

SECURITY AGREEMENT Recorded 2010-09-22

WACHOVIA BANK, NATIONAL ASSOCIATION

from CONTECH ARCH TECHNOLOGIES, INC.

CERTIFICATE OF AMENDMENT OF CERTIFICATE OF INCORPORATION Recorded 2006-04-13

WACHOVIA BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT

from ARMORTEC, INC., CONTECH ARCH TECHNOLOGIES, INC., CONTECH TECHNOLOGIES, INC., KEYSTONE RETAINING WALL SYSTEMS, INC., PETRATECH, INC., STORMWATER MANAGEMENT, INC., VORTECHNICS, INC.

SECURITY AGREEMENT Recorded 2006-03-08

CONTECH ARCH TECHNOLOGIES, INC.

from WACHOVIA BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT

TERMINATION OF SECURITY INTEREST IN PATENTS Recorded 2006-02-03

WACHOVIA BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT

from CONTECH ARCH TECHNOLOGIES, INC.

NOTICE OF GRANT OF SECURITY INTEREST Recorded 2006-01-03

CONTECH ARCH TECHNOLOGIES, INC.

from BT/CS ACQUISITION CORP.

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded 2005-08-05

BT/CS ACQUISTION CORP.

from CON/SPAN BRIDGE SYSTEMS, LTD

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded 2005-08-04

CON/SPAN BRIDGE SYSTEMS LTD.

from LOCKWOOD, WILLIAM D.

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded 2003-01-24