Item 18 — original pdf

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Item 18 # 22-3562 Water & Wastewater Commission: November 9, 2022 Council: December 1, 2022 Posting Language Recommend approval for an additional contingency for the construction contract with Pepper Lawson Waterworks, LLC for the Walnut Creek Wastewater Treatment Plant Tertiary Filter Rehabilitation project in the amount of $252,180 for a total amount not to exceed $28,047,021. (District 1). MBE/WBE This contract was awarded in compliance with Chapter 2-9A of the City Code (Minority Owned and Women Business Enterprise Procurement Program). Current participation to date is 23.73% MBE and 1.37% WBE. Lead Department Financial Services Department Client Department Austin Water Assistant Director of Engineering Services, Shay Ralls Roalson Fiscal Note Funding is available in the Capital Budget of Austin Water Purchasing Language Original contract was awarded through a competitive Invitation for Bid solicitation process. Prior Council Action June 14, 2018 - Council awarded additional contingency for the construction contract with Pepper- Lawson Waterworks, LLC for the Walnut Creek WWTP Tertiary Filter Rehabilitation project January 26, 2017 - Council awarded a construction contract with Pepper Lawson Waterworks, LLC for the Walnut Creek WWTP Tertiary Filter Rehabilitation project Council Committee, Boards and Commission Action November 9, 2022 - To be reviewed by the Water & Wastewater Commission Additional Backup Information The Walnut Creek Wastewater Treatment Plant (WWTP) receives wastewater flow from Austin Water's wastewater collection system. The plant was originally built in 1977. Over the years, the treatment plant has undergone numerous improvements and upgrades to modernize treatment methods as well as to expand treatment capacity to 75 million gallons per day (MGD) with a two2- hour peak flow of 165 MGD. Treated plant effluent is discharged into the Colorado River. A portion of the treated effluent is used for non-potable water (NPW) on the plant site and supplies much of the City’s Reclaimed Water program. The tertiary filters at the Walnut Creek WWTP serve as the final step in the wastewater treatment process. Construction of this project began in March 2017 and is substantially complete. Due to unforeseen conditions associated with rehabilitating an existing facility, change orders to date have  Item 18 # 22-3562 Water & Wastewater Commission: November 9, 2022 Council: December 1, 2022 exhausted all available contingency. Additional contingency of approximately 1% of the contract amount is requested due to the unanticipated need to replace certain valves and controls in the filter piping gallery to improve the reliability of the filter backwash system. A contingency is an additional amount of money added to the construction budget to cover any unforeseen construction costs associated with the project. By authorizing the additional contingency funding, Council is authorizing any change orders within the contingency amount. This project is located within zip code 78725 (District 1). PLW Waterworks, LLC is located in The Woodlands, Texas. Strategic Outcome(s) Health and Environment DATE DESCRIPTION 01/26/17 01/26/17 01/26/17 06/14/18 (Council) – Construction contract with Pepper Lawson Waterworks, LLC (Council) – 5% Contingency (Administrative Authority) (Council) – Additional Contingency 12/01/22 Proposed (Council) – Additional Contingency $28,049,980.00 Total Contract Authorization AUTHORIZATION HISTORY AMOUNT $25,218,000.00 $1,260,900.00 $58,000.00 $1,260,900.00 $252,180.00 CONTRACT HISTORY AMOUNT $25,218,000.00 $113,495.06 DATE DESCRIPTION (CO%/CUMULATIVE CO%) 03/23/17 Construction contract executed 09/12/17 CO #1 – Duct bank material remediation, erosion control at Sodium Bisulfate building, sewer line investigation (0.45%/0.45%) $577,134.63 11/08/17 CO #2 – Electrical code compliance, new duct bank and wiring $430,765.44 09/10/18 CO #3 – Gate operator redesign, flow meter connections, reroute 3-inch $686,330.57 04/22/19 CO #4 – Duct bank modifications, PLC/SCADA changes for two pumps (2.29%/2.74%) main (1.71%/4.45%) (2.72%/7.17%) $230,506.58 $186,842.98 08/06/19 CO #5 – Temporary filtration system pumps and piping (0.91%/8.08%) 11/18/19 CO #6 - Install duct bank, install electrical, turbidity instruments, sodium bisulfate skid modifications (0.74%/8.82%) $87,845.94 04/02/20 CO #7 – Replace portion of non-potable water piping, additional pumping $69,407.20 05/11/20 CO #8- Relocate gas line, over-pipe access walkways at clarifier 5, grout during plant shut down, allowance credit (0.35%/9.17%) $5,570.10 07/08/20 CO #9 - Modify existing Low Service Pump Sump programming coating for filters 1-4 (0.28%/9.45%) (0.02%/9.47%) ($40,151.70) 10/26/20 CO #10 – Credits: vacuum pump system, filters 2 and 4 flume walls, 8-inch pipe not installed, allowances 1,3,5, and 6 (-0.16%/9.31%) $220,225.10 $8,868.66 06/08/21 CO #11 – Equipment for wastewater monitor and additional spare pump, programming and modifications to filter control system (0.87%/10.18%) 07/26/22 CO #12 – Add air pressure monitoring for bubbler master control panel $252,180.00 Proposed Additional Contingency - (1.00%/11.22%) $278,794047,840020.56 Total Contract History (0.04%/10.22%) Walnut Creek Wastewater Treatment Plant – Site Location 7113 FM 969, Austin, Texas 78725