Project: IMX-35-5(177)02

                                                                                                     Polk County

Grimes RCE Office

2300 Southeast 17^th Street                                                                

Grimes, Iowa 50111

Dear RCE:

This letter is to document that all temporary traffic control signs and devices used on the referenced project are NCHRP 350 or MASH compliant per Iowa DOT specification article 2528.01, A.

Traffix Devices self-certification letter for their Category I drums is attached.  FHWA approval memorandums for the Category II signs and devices include the following:

WZ-46, WZ-99, WZ-111, and WZ-117.

Upon request, I will supply copies of the above documents.

                                                                                                            Yours truly,

                                                                                                John Q. Owner

                                                                                                President