Exhibit 3.40(a)

Exhibit 3.40(a) State of Delaware Secretarr of State

Division of Corporations

Delivered 06:17 PJ 09/25/2006

FTLED 06:17 PM 09/25/2008

SRV 080988897 - 3169284 FIM

STATE OF DELAWARE CERTIFICATE OF CONVERSION

FROM A CORPORATION TO A LIMITED LIABILITY COMPANY PURSUANT TO

SECTION 18-214 OF THE LIMITED LIABILITY ACT L) The jurisdiction where the Corporstion first formed is De]. aware —.

2.) The jurisdiction immediately prior to filing this Certificate is t)elaware —. 3.) The date the corporation first formed isFebruarY 1, 2000

4.) The name of the Corporation immediately prior to filing this Certificate is USC AtlaritiC, Inc.

5.) The name of the Limited Liability Company as set forth in the Certificate of Formation is NYC Ready-MIX, LLC

IN WITNESS WHEREOF, the undersigned have executed this Certificate on the 25th dy 0fSepteniber, A.D. 2008

By___ Name: Michael Harlan

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