CONSTRUCTION MATERIALS TECHNOLOGIES PRI Construction Materials Technologies, LLC CERTIFICATE OF INDEPENDENCE PRI Construction Materials Technologies, LLC does not have, nor does it intend to acquire a financial interest in any company manufacturing or distributing products for which reports or letters are issued. PRI Construction Materials Technologies, LLC is not owned, operated or controlled by any company for which it provides test, inspection, or other professional services. PRI Construction Materials Technologies, LLC does not have, nor does it intend to acquire a financial interest in any company manufacturing or distributing products for test, inspection, or other professional services are rendered. PRI Construction Materials Technologies, LLC also requires that each employee maintain independence. Questions or concerns regarding independence shall be brought to the attention of the Managing Director. Zachary R. Priest, P.E. does not have nor does he intend to acquire a financial interest in any company manufacturing or distributing products for which reports or letters are issued. Duc T. Nguyen, P.E. does not have nor does he intend to acquire a financial interest in any company manufacturing or distributing products for which reports or letters are issued. Charles L. Thomas, P.E. does not have nor does he intend to acquire a financial interest in any company manufacturing or distributing products for which reports or letters are issued. Signed: Signed: Brad Grzybowski Zachary R. Priest Managing Director Florida Registered Professional Engineer P.E. Number: 74021 Date: 08/29/14 Signed: Date: Date: 08/29/14 Signed: Duc T. Nguyen Charles L. Thomas Florida Registered Professional Engineer Florida Registered Professional Engineer P.E. Number: 65034 P.E. Number: 29439 08/29/14 Date: 08/29/14 PRI Construction Materials Technologies, LLC. 6412 Badger Drive Tampa, FL 33610 Tel: 813-621-5777 Fax: 813-621-5840 e-mail: materialstesting@pricmt.com WebSite: http://www.pricmt.com