Cedar Creek Site 136 is a floodwater detention dam built in 1965 and located 12 miles southwest of Canton, Van Zandt County Texas. The dam is approximately 1,077 feet long and 30 feet high. Repair work began in April 2021 and was completed in July 2021 at a nominal cost of $402,720.
Rock-riprap was used to armor the shoreline which had eroded from wave-action. The front slope near the shoreline was reshaped and a wave-berm constructed before rock-riprap was placed. The corrugated metal principal spillway conduit was slip-lined with HDPE pipe. The slide gate was replaced with an enclosed knife gate. The concrete riser was coated with a Portland cement-based coating to protect it from further deterioration. The trash rack was replaced. The entire site fence was removed and a new fence constructed in its place. All disturbed areas were tilled, fertilized, seeded, and hay mulched.
The repair was designed by M&E Consultants, LLC (M&E). Van Zandt County contracted with Mann Robinson & Son, Inc. in Aubrey, Texas to perform the repair work.
M&E’s contract specialist provided contracting services to the County for advertising the work, soliciting contractors to bid the work, posting the bid documents, conducting a pre-bid meeting and site showing, opening bids, and awarding the contract. M&E’s contract specialist also provided guidance and counseling throughout the performance period in all aspects of contract administration.
M&E performed construction oversight to verify specification compliance. M&E’s construction inspector provided full-time construction inspection for quality assurance (QA) including maintaining a job diary; QA testing; and interpretation of drawings, specifications, geology reports, soil mechanics reports, and contract provisions. The inspector was supervised by a project engineer who is a professional engineer registered in Texas. In addition to overseeing the QA inspection, the project engineer monitored construction progress and certified that work accomplished during each invoice period was performed in accordance with contract requirements.
There were four contract modifications needed to complete the work. M&E’s contract specialist and project engineer assisted the County in negotiating with the contractor to determine the change in contract price and performance time and modify the contract.
M&E’s project engineer scheduled and conducted a check-prior-to-final inspection with County representatives, coordinated final as-built surveys, and scheduled and conducted a final inspection with the County’s contracting officer.
The contract specialist and the project engineer assisted the County with final payment and closeout of the construction contract by ensuring and certifying that final payment quantities were correct and the final invoice did not include a request for any work that had not been accomplished in accordance with the contract.
After the contractor demobilized and the construction contract was closed out, M&E completed and submitted the as-built plans to the County.
Riser prior to coating.
Front of dam prior to beginning work
Slide gate prior to removal
Rock riprap on front slope
Knife gate installed on inside of riser
Riser after coating with Portland cement based coating and installing new trash rack
Preparing to insert HDPE pipe into existing CMP conduit
High-shear mixer for producing cellular-foam grout
Areal image of project nearing completion