The Round Rock City Council on Tuesday approved supplemental engineering and construction oversight agreements with Plummer Associates Inc. as the Brushy Creek East regional wastewater treatment plant moves into its next expansion and construction phases.
The council approved supplemental contract No. 2 with Plummer Associates, a design/engineering firm, to cover design work related to the planned 10 million gallon-per-day (MGD) expansion (raising capacity beyond the current 30 MGD). The supplemental is for $567,000; staff reported Round Rock’s share of that supplemental is about $440,000, with partner cities contributing the remainder consistent with the regional cost‑share model.
Council also approved supplemental contract No. 3 with Plummer Associates for resident inspection and construction administration services during the 30 MGD expansion currently under construction. The supplemental No. 3 is for $1.4 million to cover site inspection time and related services through December 31; staff said the contract is time-and-materials and the city will only pay for actual hours worked. The project manager told the council the construction schedule is tracking to substantial completion later this year, but staff requested the supplemental to ensure inspection coverage while the contractor completes work.
Round Rock manages the regional plant on behalf of participating cities and staff said Round Rock will receive roughly 9 MGD of the new 10 MGD capacity while Austin would receive about 1 MGD. Plummer staff present at the meeting included project manager Perron Hutton and on-site inspectors David Murata and Aaron Waters.
The council’s actions were approved by motion with recorded votes.
Staff said the design phase for the next 10 MGD expansion should be complete later this fall, with a planned bid solicitation in late summer or fall of next year and approximately three years of construction once bids are awarded.