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Final Technical Memorandum Summary

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Final Technical Memorandum Summary Final Technical Memorandum Summary Project: Dallas –2014 Long Range Water Supply Plan Memo: TM 25- IPL Integration TM Submitted to Dallas: Monday, November 17, 2014 Associated Report Section (s): Section 7.5 TM Summary Technical Memorandum 25 (TM-25) presents the findings from analysis evaluating various alternatives for delivery of the Lake Palestine supply through the Integrated Pipeline (IPL) with Tarrant Regional Water District (TRWD) to the Bachman WTP. TM-25 includes an evaluation of adding a fourth water treatment plant (Southwest WTP) to the Dallas system and compares the cost with the expansion of Dallas’ Elm Fork WTP and associated facilities. Related Sections in 2014 Dallas LRWSP TM 25 was used in the development of Section 7.5 of the 2014 Dallas Long Range Water Supply Plan (LRWSP) describing the IPL connection to the Bachman WTP. Transition from Final TM to 2014 Dallas LRWSP No substantial changes occurred between the finalization of TM-25 and the completion of the LRWSP. Minor refinements may have occurred in response to comments received from Dallas and meetings that occurred throughout the LRWSP process. Any edits after the release of TM- 25 are not considered significant and do not change the results or recommendations presented. This Page Intentionally Left Blank April 2015 | 1 Dallas LRWSP – Memo To: Dallas Water Utilities From: Adam Cory Shockley Texas P.E. 94761, Kenneth Choffel, Texas P.E. 45686, HDR Engineering, Firm Registration F-754. Date: November 17, 2014 Subject: IPL Integration – Task 4.15 – Technical Memorandum 25 The purpose of this technical memorandum (TM) is to furnish the results of Task 4.15 of the Dallas Long Range Water Supply Plan (LRWSP). These results present the findings from the analysis evaluating various alternatives for delivery of the Lake Palestine supply through the Integrated Pipeline (IPL) with Tarrant Regional Water District (TRWD). This TM includes an evaluation of adding a fourth water treatment plant (Southwest Water Treatment Plant or Southwest WTP) to the Dallas system and compares the cost with the expansion of Dallas’ Elm Fork WTP and associated facilities. This TM was prepared by CDM-Smith with review performed by HDR Engineering. The Tarrant Regional Water District (TRWD) and City of Dallas have partnered on the planning and development of an integrated raw water transmission system to meet future water needs in North Central Texas. The purpose of the Integrated Pipeline (IPL) is to bring water from Lake Palestine, Richland-Chambers Reservoir and Cedar Creek Reservoir to Dallas and TRWD in a cost efficient way as water demands grow. The 150-mile long raw water transmission pipeline from Lake Palestine to Lake Benbrook ranges in diameter from 84-inch to 120-inch conveying water with a peak planned capacity of 347 million gallons per day (mgd). Dallas’ portion of the capacity of the shared pipeline is planned to be 150 mgd. This TM presents six alternatives available to Dallas to bring water into their system from the IPL. These six alternatives deliver water through the Joe Pool area to the Bachman WTP using a variety of pipeline and open channel flow options. Table ES-1 presents a comparison of the six alternatives of both quantitative costs and qualitative criteria. The capital cost range from $832M to $1,020M dollars and include transmission costs, water treatment plant expansion / construction costs, and treated water transmission improvements (distribution system) costs. All of these components are required to fully integrate the IPL-Palestine water into the Dallas system. Annual costs range from $63 M to $83 M and include energy costs, staffing and administration costs for the new Southwest WTP and debt service. HDR Engineering, Inc. Page 1 of 2 Table ES-1. Comparison Matrix Summary Legal/ Transmission Total Total Permitting Water Quality/ Alternatives Political System Capital Cost Annual Cost Feasibility Blending Feasibility Flexibility Alternative 1 – Delivery of water from the IPL $ 1020 M $73 M MEDIUM LOWER LOWER LOWER directly to the Bachman WTP by pipeline Alternative 2 – Delivery of water from the IPL to Joe Pool for diversion from Joe Pool Lake to $ 951 M $69 M MEDIUM MEDIUM MEDIUM LOWER Bachman WTP by pipeline Alternative 3 - Delivery of water from the IPL to Joe Pool with water released from Joe $ 886 M $64 M MEDIUM MEDIUM HIGHER LOWER Pool for diversion from Mountain Creek to Bachman WTP by pipeline Alternative 4 - Delivery of water from the IPL MUCH directly by pipeline to a new 150 mgd $ 934 M $83 M MEDIUM LOWER MEDIUM HIGHER Southwest WTP near Joe Pool Lake Alternative 5 - Delivery of water from the IPL MUCH to Joe Pool Lake for diversion from Joe Pool $ 832 M $77 M HIGHER MEDIUM MEDIUM HIGHER Lake to a new 150 mgd Southwest WTP Alternative 6- Delivery of water from IPL through Joe Pool, Mountain Creek Lake and $ 874 M $63 M HIGHER MEDIUM HIGHER LOWER Trinity River Channel to Bachman WTP Note that raw water transmission costs are based on open-cut trenching along the floodway only. Should tunneling be required, it would add an additional estimated $262 M in capital costs and $ 18 M in annual costs. Key findings of the TM include: A new Southwest WTP would incur higher annual costs than routing IPL water to the Bachman WTP, and would also incur comparatively high implementation risks. This suggests that a preferred alternative includes routing the water to the Bachman WTP, through one of four remaining alternatives. Of the remaining four alternatives that route IPL water to the Bachman WTP and rely upon expanding the Elm Fork WTP, there appears to be tradeoffs between risk and capital/annual costs. Both capital and probable annual costs decrease with increased utilization of open water bodies for conveyance, but the implementation risks increase. Based on the information presented in this memorandum: o To minimize near-term costs, Alternative 6 (Trinity River Dam and maximum usage of open water bodies for conveyance) would be preferred. o To minimize risk and invest in a higher likelihood of success, Alternative 1 (pipeline directly from the IPL to the Bachman Plant) would be preferred. o Alternative 2 (routing water only through Joe Pool Lake and piping it the rest of the way to Bachman) represents a reasonable balance between expected costs and risks based on the current qualitative rankings. o A joint study with Dallas and the owners of Joe Pool Lake and Mountain Creek reservoir is advised to determine opportunities to use those bodies for conveyance as opposed to the pipeline conveyance options. HDR Engineering, Inc. Page 2 of 2 Dallas LRWSP – Memo To: Ken Choffel, P.E. HDR From: Tina Petersen, Ph.D., P.E. 1, Tom Charles, P.E.1, Project: Dallas Long Range Water Supply Plan Susan Crawford, P.E.1, Mike Gilbert CC: Cory Shockley, P.E. Date: November 17, 2014 Task/ 10733-94576 Task 4.15 Job No: Technical Memorandum 25 - IPL Integration Options and Southwest WTP Recommendation 1 CDM Smith, Texas Firm No. F-3043 RE: Evaluation of Alternatives for Delivery of Water from the Integrated Pipeline (IPL) and Potential New Southwest WTP 1. Introduction Dallas will require additional water supply within the next 50 years from surface water, groundwater, demand reduction, and/or reuse. As part of the 2014 Dallas Long Range Water Supply Plan (LRWSP), the HDR-CDM Smith Team has evaluated options for integrating water from the IPL into the Dallas system considering both treatment and distribution facilities. The Tarrant Regional Water District (TRWD) and City of Dallas have partnered on the planning and development of an integrated raw water transmission system to meet future water needs in North Central Texas. The purpose of the Integrated Pipeline (IPL) is to bring water from Lake Palestine, Richland-Chambers Reservoir and Cedar Creek Reservoir to Dallas and TRWD in a cost efficient way as water demands grow. The 150-mile long raw water transmission pipeline from Lake Palestine to Lake Benbrook ranges in diameter from 84-inch to 120-inch conveying water with a peak planned capacity of 347 million gallons per day (mgd). Dallas’ portion of the capacity of the shared pipeline is planned to be 150 mgd. The IPL was subdivided into segments to facilitate description of the system, allocate costs between TRWD and Dallas as well as split the design and construction into multiple packages. Figure 1 shows the various pipe segments, lake intake stations, and the three booster pump stations that are part of the IPL transmission system. Segment 12 as currently planned (shown in this figure) will deliver Dallas’ portion of water carried through the IPL (a blend of Lake Palestine water with Richland Chambers and/or Cedar Creek Reservoir under most scenarios) to Dallas at a location southwest of Joe Pool Lake. CDM Smith 8140 Walnut Hill Lane Phone (214) 346-2800 Page 1 of 37 TBPE Firm Reg No. F-3043 Suite 1000 Fax (214) 987-2017 Dallas, Texas 75231 URL www.cdmsmith.com Dallas LRWSP – Evaluation of Alternatives for Delivery of Water from IPL and Potential New Southwest WTP Figure 1. IPL Pipe Segments (from http://www.iplproject.com/about-the-ipl/map/) CDM Smith 8140 Walnut Hill Lane Phone (214) 346-2800 Page 2 of 37 TBPE Firm Reg No. F-3043 Suite 1000 Fax (214) 987-2017 Dallas, Texas 75231 URL www.cdmsmith.com Dallas LRWSP – Evaluation of Alternatives for Delivery of Water from IPL and Potential New Southwest WTP In this memorandum, five (5) previously evaluated alternatives are further evaluated and refined while one new alternative (Alternative 6) is also introduced and evaluated. These alternatives include: Alternative 1 – Delivery of water from the IPL directly to the Bachman Water Treatment Plant (WTP) by pipeline.
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