Complications On The Rio Grande

Storm Sewer Trunk Line Is Successfully Rehabilitated Using Two Trenchless Methods
By Jeff Griffin, Senior Editor | May 2009 Vol. 64 No. 5
The access pit for FRP insertion.

Relining of both segments was completed in approximately six months and in spite of the early delays, the unanticipated void repair and other complications, work was completed on time and within the contract amount.

Reflecting on the project's importance, city of Laredo Director of Environmental Services Riazul Mia, P.E., CFM, said: "The goal of the project was to preserve service of the storm sewer system and to prevent a catastrophic failure of the existing trunk line. The use of the trenchless rehabilitation for the section of storm sewer minimized impact of the construction phase to the surrounding area and resulted in a timely and cost saving delivery.

"Additionally, the material properties for the fiberglass and spiral wound PVC pipes that were used provided for structural support and maintained capacity of the existing storm sewer with a reduced diameter."

As Laredo's infrastructure programs continue, LAN has been awarded a contract to design a 42-inch storm sewer, which includes rehabilitation of a 24-inch segment with illegal connections to the sanitary sewer system. Construction is planned to begin in the fall of 2009.

Lockwood, Andrews & Newnam is a national engineering firm offering planning, engineering, and program management services. As a subsidiary of Leo A. Daly, one of the largest planning, architecture, engineering and interior design firms in the United States, LAN has access to the expertise of more than 1,100 professionals in 25 offices in 21 cities worldwide.

Huff & Mitchell specialize in water and sewer utility construction.

Established in 1948, Boring & Tunneling Company of America is experienced in all types of tunneling and boring methods serving a wide range of clients throughout the United States and internationally.


Lockwood, Andrews & Newnam (LAN) Inc., (713) 266-6900,
Sekisui SPR Americas, (678) 510-1820,
Boring & Tunneling Company (BorTunCo), (713) 799-1200,
Huff & Mitchell, (281) 304-9100

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