Title
Discuss and consider action to approve a Supplemental Agreement #1 with Freese and Nichols, Inc. in the amount of $3,442,165 for professional engineering services associated with the plant expansion final design and bid phase services for the Central Wastewater Treatment Plant.
Summary
Wastewater flow to the City of Pflugerville’s Central Wastewater Treatment Plant (WWTP) has exceeded 75% capacity of the permitted capacity and the growth trend indicates the plant could exceed 90% capacity as early as 2021.
The City is planning to expand the wastewater plant from 5.3 MGD to 10.0 MGD to meet projected needs. The City has submitted a Texas Pollutant Discharge Elimination System (TPDES) Permit Amendment and it is anticipated the plant expansion must be designed to meet 5/5/2/1 (mg/L for biochemical oxygen demand, total suspended solids, ammonia and phosphorous respectively). In addition to providing increased capacity, some of the existing unit processes are aging and require rehabilitation/replacement to enable those units to serve as reliable components of the expanded system.
Freese and Nichols (FNI) was awarded a contract at the March 28, 2017, Council meeting for preliminary design services and a conceptual design report with recommendations was submitted on December 19, 2017.
In the report, FNI recommended, in addition to increasing the plant capacity, treatment processes should be upgraded to provide for biological nutrient removal (BNR) of phosphorous to replace the existing chemical phosphorous precipitation process. Upgrading the treatment process to BNR will significantly reduce the volume of waste sludge produced and save the City disposal costs. FNI’s report also identified several high priority improvements, referred to as interim improvements, which are needed to maintain plant capacity and permit compliance during the period of time while the plant expansion project is ongoing. The construction agreement for the interim improvements was a...
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