Michigan
| Green Infrastructure Partners, Inc. 20501 Goddard Road Taylor, Michigan 48180 |
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| Northern Concrete Pipe, Inc. 401 Kelton Street Bay City, Michigan 48706 |
Northern Concrete Pipe, Inc. 5281 Lansing Road Charlotte, Michigan 48813 |
Northern Concrete Pipe, Inc. 4950 White Lake Road Clarkston, Michigan 48346 |
| Northern Concrete Pipe, Inc. 3756 Centennial Road Sylvania, Ohio 43560 |
Northern Concrete Pipe, Inc. 2701 Chicago Drive SW Wyoming, Michigan 49519 |
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| Upper Peninsula Concrete Pipe Co. P.O. Box 313 6480 US 2 & 41 Escanaba, Michigan 49829 |