Regional Service Through Unity… Meeting our Region’s Needs Today and Tomorrow WASTEWATER COMMITTEE MEETING July 21, 2020 (Via Teleconference)
CLICK TO EDIT MASTER TITLE STYLE AGENDA Opening Remarks A. Chairman/Executive Director/Committee Champion Status Report concerning legislation and regulatory matters, budgets, current projects and ongoing Wastewater System programs of the District 2
Agenda AGENDA Action Items A. Consider Approval of Wastewater Committee Meeting Minutes – June 24, 2020 Recommend Approval of Wastewater Committee Meeting Minutes 3
Agenda AGENDA Action Items B. Execution of Engineering Services Agreement for Buffalo Creek Interceptor Tunnel – Administrative Memorandum No. 5601 • Consider recommendation on authorizing the Interim Executive Director to execute engineering services agreement with Gresham Smith in the amount of $2,391,254 for final engineering design on Project No. 507-0549-19, Buffalo Creek Interceptor Tunnel WHAT: Authorize an engineering services agreement for final design for the Buffalo Creek Interceptor Tunnel project, formerly called the Buffalo Creek Force Main Parallel project. WHY: Provide a gravity interceptor tunnel to convey 2040 flows from the Buffalo Creek Lift Station to the South Mesquite Creek Regional Wastewater Treatment Plant as recommended by the preliminary engineering report in lieu of a parallel force main and lift station improvements 4
BUFFALO CREEK INTERCEPTOR TUNNEL Existing Buffalo Creek Lift Station constructed in 2004 and expanded in 2007 to 30 MGD (6 pumps) Conveyed through a 36-inch FM to South Mesquite Creek RWWTP 5
BUFFALO CREEK INTERCEPTOR TUNNEL Additional capacity of 45 MGD needed in the Buffalo Creek Interceptor System to convey flows up to 2040 due to growth in the service area • Alternative 1 – Construction of a second lift station and force main at a cost of $30.9 million (including $4.7 million of needed replacements on existing lift station) • Alternative 2 – Construction of a gravity pipeline for additional 45 MGD capacity at a cost of $25.6 million • Alternative 3 (Recommended) – Construction of a gravity pipeline for the total 75 MGD at a cost of $28.7 million. An estimated $80 million in savings will be realized in O&M costs as this option allows the decommissioning of the existing lift station and force main Consideration of a pipe size increase to accommodate 40 MGD from the City of Forney pending further evaluation of cost impacts to the cities. 6
BUFFALO CREEK INTERCEPTOR TUNNEL Project Components • Interceptor will be tunneled beneath the East Fork of the Trinity River and the floodplain • Minimize environmental impacts and avoid State Registered cultural resources site • Avoids an area with multiple utilities (water, gas, and wastewater) • Reduces the impact of dam releases from Lake Ray Hubbard and general flooding in the area during construction • Energy Dissipator will be installed at Buffalo Creek Lift Station site • To manage flows in a way that prevents turbulence which can cause odors • Tunnel shaft at the SMRWWTP will be used as the wet well for the new Plant lift station • Engineer’s OPCC is $28.7 Million • Submitted for Texas Water Development Board funding 7
Agenda RECOMMENDATION Consultant: Gresham Smith Scope: Final Engineering Design Project: No. 507-0549-19, Buffalo Creek Interceptor Tunnel Amount: $2,391,254 8
Agenda AGENDA Action Items C. Authorize Change Order No. 15 and Release of Retainage on Princeton Lift Station Improvements project – Administrative Memorandum No. 5603 • Consider recommendation on authorizing construction Change Order No. 15 with Crescent Constructors, Inc., in the amount of $438,591 and an additional 140 days and authorize release of retainage in the amount of $165,561.78 What: Authorize funding for a change order and a partial release of retainage for the Princeton Lift Station Improvements project. Why: Work on the lift station has reached substantial completion and is in operation. It is recommended retainage be released on work that has been completed and accepted. A change order is requested to add the fourth pump to this project for consistency and cost efficiency. Retainage will be withheld for the remaining change order work until it is completed. 9
PRINCETON ROAD LIFT STATION IMPROVEMENTS Project Components • New lift station to accommodate 25 MGD capacity • New pumping to provide 8 MGD firm capacity • New electrical, instrumentation, and controls 10
PRINCETON ROAD LIFT STATION IMPROVEMENTS Additional Pump & Reduction in Retainage • Coordinate growth projections with the City to balance cost of capacity improvements with the timing of need. A pump slot was included to allow flexibility to add a pump if growth occurred which has been realized. Addition of 4 th pump now saves • construction costs and increases capacity from 8 MGD to 12 MGD • Avoids a separate design and construction project and provides consistent pump and electrical equipment • Additional pump, piping, electrical and instrumentation cost is $438,591 • Recommend reducing retainage on the completed lift station work from 2% to 0% in the amount of $165,561.78 11
Agenda RECOMMENDATION Contractor: Crescent Constructors, Inc. Scope: Construction, Change Order No. 15 and Release of Retainage Project: No. 501-0401-15, Princeton Lift Station Improvements Reduction In Retainage: $165,561.78 Additional Amount: $438,591.00 Additional Days: 140 days 12
Agenda AGENDA Action Items D. Additional Engineering Services and Adoption of Resolution No. 20-34 authorize use of competitive sealed proposal procurement method for North McKinney Transfer Lift Station and North McKinney Transfer Force Main projects – Administrative Memorandum No. 5602 • Consider recommendation on authorizing additional engineering services with AECOM Technical Services, Inc., in the amount of $566,633 on Project No. 501-0513-18, North McKinney Transfer Lift Station and adoption of Resolution No. 20-34 authorizing use of competitive sealed proposal procurement method under Texas Government Code Chapter 2269 for the North McKinney Transfer Lift Station, Project No. 501-0513-18, and the North McKinney Transfer Force Main, Project No. 501-0514-18 WHAT: Authorize funding for additional engineering services and the use of Competitive Sealed Proposal procurement method for construction of both the North McKinney Transfer Lift Station and the North McKinney Transfer Force Main projects. WHY: Additional engineering services are requested for the design and construction phase services of the expansion of the proposed North McKinney Transfer Lift Station to convey up to 128 million gallons per day peak flow to the Sister Grove Regional Water Resource Recovery Facility. The authorization to use the CSP procurement method for construction is requested for these projects due to their critical nature in supplying flow to the Sister Grove RWRRF project. 13
NORTH MCKINNEY TRANSFER LIFT STATION & FORCE MAIN Additional Engineering Services • AECOM Technical Services is under contract to provide design plans and specifications for Phase I of North McKinney Transfer Lift Station (NMTLS) and North McKinney Transfer Force Main (NMTFM) to transfer flow to Sister Grove RWRRF. • Phase I capacity of NMTLS is 64 MGD. Phase II construction which expands the NMTLS to 128 MGD commences immediately after the completion of Phase I. Phase II of NMTLS is recommended to be included with Phase I for an additional construction cost of $9M. • Competitive Sealed Proposal (CSP) Procurement method allows NTMWD to establish weighted selection criteria for contractor selection based on price, experience and past performance. • Schedule of these two projects is critical as the system will convey wastewater flows to the Sister Grove RWRRF for treatment. 14
Agenda RECOMMENDATION Consultant: AECOM Technical Services, Inc. Scope: Additional Engineering Services and CSP Procurement Method Project: No. 501-0513-18, North McKinney Transfer Lift Station No. 501-0514-18, North McKinney Transfer Force Main Amount: $566,633 (Project No. 501-0513-18) 15
Agenda AGENDA Action Items E. Execution of Right-of-Way Acquisition Program and Adoption of Resolution No. 20-35 Authorizing Use of Eminent Domain to Acquire Right-of-Way for the Sister Grove Regional Water Resource Recovery Facility Outfall Pipeline project – Administrative Memorandum No. 5604 • Consider recommendation on authorizing the Interim Executive Director to execute a right-of-way acquisition program for with a budget of $3,193,000; and, adoption of Resolution No. 20-35 authorizing the use of eminent domain to acquire right-of-way for the Sister Grove Regional Water Resource Recovery Facility, Outfall Pipeline, Project No. 301-0426-16, and delegating authority to initiate condemnation proceedings to the NTMWD Interim Executive Director WHAT: Authorize funding to acquire permanent and temporary easements for the outfall pipeline at the Sister Grove Regional Water Resource Recovery Facility WHY: The outfall pipeline will transport treated water from the Sister Grove RWRRF to Stiff Creek, which flows into Sister Grove Creek and ultimately into Lavon Lake. 16
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