This contract modification no. 2 is for lift station 23 upgrades and forcemain replacement with Astra Grading and Pipe, LLC in the amount of $127,995. The increased cost is due to the need to include two additional concrete thrust blocks that are significantly larger and more complex than normally required to tap and restrain the existing sanitary force main. Project value engineering reduced project bid by $1.9 million by tapping into the existing force main after it crossed the Springfield Canal. Due to this crossing being overhead of the canal, the existing main could not provide thrust resistance as it would if it were buried. 

Additionally, the existing main downstream of the tap had to be cut and a section removed to insert an isolation plug valve (allows use of the existing forcemain as an emergency bypass), further reducing the ability of the existing main to resist the thrust created by the 90-degree turn of the flow. Given the presence of the canal a few feet away from the work area, the risk of creating leaks in the aerial crossing, and the need to protect these waters, the additional larger thrust blocks are deemed necessary to safely complete the project. The current contractor is:

Astra Grading and Pipe, LLC (6001 Chatham Center Drive, Suite 140, Savannah, GA)

This contract was originally approved by City Council on December 19, 2023, in the amount of $19,273,000. Contract modification no. 1 was approved by City Council on December 19, 2023, in the amount of $501,270. The total amount of this contract, including this modificaiton, is $19,902,265.

Approval