The Denison City Council approved a $1.09 million contract Monday with Pittard Construction Co. for the replacement of four aging sewer lines throughout Denison. The replacement of these sewer lines is a part of an agreement between the city and the Texas Commission on Environmental Quality dating back to 2008.

Reaume said the city plans to replace about 10,000 feet of aging and failing asbestos cement pipe and clay pipeline dating back 40 to 50 years with modern PVC pipelines. In 2008, the TCEQ discovered ten sewer lines that were failing and entered into an agreement with Denison to replace the pipe over the course of the next ten years, to mitigate any penalties the city might face.

“Because Denison is an older city, we have a lot of old infrastructure and old sewer lines,” Reaume said, remarking on the older style pipes throughout the city. Reaume said these forms of pipe have since been replaced by more modern technology and PVC is now the industry standard.

Reaume said clay and cement pipelines have a lifetime of about 30 years, on average; PVC lines have an expected lifespan of between 50 and 70 years.

As the city’s existing sewer infrastructure ages, Reaume said the pipes have become brittle and porous and allowed infiltration of outside water and material into the line and the city’s water system. As such, the city’s water treatment plants have experienced excessive use and treatment during storms as rain water has made its way into the system.

Since 2008, the city has completed three of the ten projects with seven remaining. Monday’s contract will cover four of the remaining projects listed in the agreement. Among these projects is a replacement of 1,800 feet of pipe stretching from the 1800 block of Woodlawn to Crestview and 2,700 feet of line running from West Day to South Lang.

When the projects were put out to bid, the city received four proposals with Pittard submitting the low bid at $1,087,935. The high bid of $1.74 million was submitted by Lynn Vessels Construction.

Reaume said he was pleased with the bidding process as three of the four bids were within the engineer’s estimate of about $1.21 million. During Monday’s meeting, Reaume voiced his satisfaction with the bidding process and the fact the city was able to save over $100,000 on the projects.

When asked if the city has done business with Pittard in the past, Reaume said the city has never worked with Pittard before. However, Huitt Zollars, who will be providing engineering services for the project, vetted all of the applications and found Pittard’s proposal to be acceptable.

Reaume said the city plans to bid out the final three projects in the agreement in late 2017, with construction expected to take place sometime in 2018. This would complete the agreement, which is scheduled to extend through December 31 of that year.