Antelope Valley Aggregate, Inc.

Cemex, Inc.

Vulcan Materials Co.

Vulcan Materials Co.

United Rock Products Corp.

Livingston Graham

Curtis Sand & Gravel Co.

Vulcan Materials Co.

Vulcan Materials Co.

Hi-Grade Materials Co.

Service Rock Products Corp.

Granite Construction Co.

Holliday Rock Co., Inc.

Sls & N, Inc.