8h. Memo
Water Main Improvements
COMMISSION AGENDA MEMORANDUM Item No. 8h ACTION ITEM Date of Meeting September 13, 2022 DATE: September 6, 2022 TO: Stephen P. Metruck, Executive Director FROM: Keri Stephens, Director, AV Facilities & Capital Programs Eileen Francisco, Director, Aviation Project Management Group SUBJECT: 1947 Water Main Improvements (CIP #C801224) Amount of this request: $1,025,000 Total estimated project cost: $4,319,000 ACTION REQUESTED Request Commission authorization for the Executive Director to complete design of the 1947 Water Main Improvements project at Seattle-Tacoma International Airport. The requested authorization amount is $1,025,000 for a total authorization of $1,100,000. EXECUTIVE SUMMARY The Utility Master Plan has identified the existing 1947 water transmission main to be deficient or nearing the end of serviceable lifespan. This deficient water main will be addressed by a program of three projects, including this 1947 Watermain Improvement project. The selected portion of water main for this project provides the primary feed to the Central Plant cooling towers, North Toll Plaza, Light Rail Station; and secondary feed to large fire flow facilities such as Delta Hangar, Alaska Hangar, Main Garage and Fuel Farm. The pipe needs to be restored to protect the integrity of Port’s water system. Instead of a costly and highly impactful traditional remove-and-replace method, the Port is pursuing restoration by pipelining, namely Cured-In- Place-Pipe. The design of this project will include analyzing the best pipe rehabilitation method. JUSTIFICATION This project will support the Century Agenda goal to advance this region as a leading tourism destination and business gateway by meeting the region’s air transportation needs through improving vital facilities and infrastructure in a sustainable and cost-effective manner. This water main has reached the end of its serviceable life and has experienced multiple failures requiring emergency repairs, most recently in January 2021. This project will extend the serviceable life of the water main, and the low-impact method of installation will also minimize traffic delays and overall construction duration. Template revised January 10, 2019. COMMISSION AGENDA – Action Item No. 8h Page 2 of 4 Meeting Date: September 13, 2022 Diversity in Contracting The design of this project will utilize an existing Indefinite Delivery / Indefinite Quantity (IDIQ) Contract to provide design services. The contract has a 10% over-all WMBE participation goal. The project team will work with Diversity in Contracting department to establish additional WMBE goals for the construction contract. DETAILS The project will restore the water main from where it begins south of the S 182nd St intersection with International Blvd adjacent to the light rail guideway, traveling north under the Northern Airport Expressway (NAE) (located east of the Main Garage), and ending under the NAE approximately, north of the light rail pedestrian bridge. The entire length of watermain addressed will be approximately 2,400 linear feet. Scope of Work The 16-inch steel water main will be restored by pipe lining, which is more cost-effective and less operationally impactful than the traditional remove-and-replace methodology. Additionally, the project will replace existing tees and provide access vaults or manholes to ease future access needs for reaching the water main, which is twenty feet deep in some locations under the NAE. Schedule Design start 2022 Quarter 3 Commission construction authorization 2023 Quarter 3 Construction start 2024 Quarter 1 In-use date 2024 Quarter 3 Cost Breakdown This Request Total Project Design $1,025,000 $1,100,000 Construction $0 $3,219,000 Total $1,025,000 $4,319,000 ALTERNATIVES AND IMPLICATIONS CONSIDERED Alternative 1 – Continue addressing emergency failures Cost Implications: $500,000 per event based upon past failures Pros: (1) Requires no capital investment Cons: (1) Emergency failures cause unexpected damage and disruption to operations (2) Does not address water main pipe that is beyond its serviceable life. Will likely require more frequent emergency repairs. Template revised June 27, 2019 (Diversity in Contracting). COMMISSION AGENDA – Action Item No. 8h Page 3 of 4 Meeting Date: September 13, 2022 This is not the recommended alternative. Alternative 2 – Remove-and-replace water main Cost Implications: $12,000,000 Pros: (1) Completely replaces the 74-year-old pipe with new piping providing a fifty-year service life (2) Potential for increased capacity Cons: (1) Major disruption to operations (lane closures, detours, roadway capacity reduction) (2) Requires significant capital investment This is not the recommended alternative. Alternative 3 – Restore the pipe by lining Cost Implications: $4,319,000 Pros: (1) Reasonably priced solution (2) Design service life is fifty-years (3) Minimizes impacts to operations (only access pits at tee and valve replacement locations) Cons: (1) Relies on existing pipe to form and house liner (2) Minimally reduces inner pipe diameter, which may reduce flow capacity This is the recommended alternative. FINANCIAL IMPLICATIONS Cost Estimate/Authorization Summary Capital Expense Total COST ESTIMATE Original estimate $2,263,000 $0 $2,263,000 Current change $2,056,000 $0 $2,056,000 Revised estimate $4,319,000 $0 $4,319,000 AUTHORIZATION Previous authorizations $75,000 $0 $75,000 Current request for authorization $1,025,000 $0 $1,025,000 Total authorizations, including this request $1,100,000 $0 $1,100,000 Remaining amount to be authorized $3,219,000 $0 $3,219,000 Template revised June 27, 2019 (Diversity in Contracting). COMMISSION AGENDA – Action Item No. 8h Page 4 of 4 Meeting Date: September 13, 2022 Annual Budget Status and Source of Funds This project, CIP C801224, was included in the 2022-2026 capital budget and plan of finance with a budget of $2,263,000. A budget of $2,056,000 was transferred from the Utility Master Plan Reserve CIP (C801267) resulting in a zero net change to the Aviation capital budget. The funding sources will be the Airport Development Fund (ADF) and revenue bonds. Financial Analysis and Summary Project cost for analysis $4,319,000 Business Unit (BU) Utility storm water project would be recovered through utility internal charge that would impact 80.8% to airlines. Effect on business performance NOI after depreciation will increase due to inclusion of (NOI after depreciation) capital (and operating) costs in airline rate base. IRR/NPV (if relevant) N/A CPE Impact $.01 in 2025 Future Revenues and Expenses (Total cost of ownership) The operations and maintenance costs are anticipated to be minimal. ATTACHMENTS TO THIS REQUEST (1) Vicinity Map PREVIOUS COMMISSION ACTIONS OR BRIEFINGS None Template revised June 27, 2019 (Diversity in Contracting).
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