8b. Memo - Departure Drive Drainage Project
COMMISSION AGENDA MEMORANDUM Item No. 8b ACTION ITEM Date of Meeting July 27, 2021 DATE: July 16, 2021 TO: Stephen P. Metruck, Executive Director FROM: Eileen Francisco, Acting Director, AV Facilities & Capital Programs Wayne Grotheer, Director, Aviation Project Management SUBJECT: Departures Drive Drainage (C801036) Amount of this request: $500,000 Total estimated project cost: $1,880,000 ACTION REQUESTED Request Commission authorization for the Executive Director to complete design on the Departures Drive Drainage project at Seattle-Tacoma International Airport (SEA). This authorization is for $500,000 for a total estimated project cost of $1,880,000. EXECUTIVE SUMMARY This project rehabilitates a portion of the departures drive storm drainage system and existing bridge expansion joints. The storm drainage system has failed along the south end of the departures drive. An existing catch basin and associated drainage pipe is plugged and has been paved over. Stormwater currently ponds at this location, leaks through the structure and discharges onto rental car customers waiting on the arrivals curbside below. The project will replace the existing storm drainage facilities and expansion joints, and complete minor paving. 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 project will improve customer service for rental car customers and reduce ongoing maintenance due to stormwater leaking from the departures drive onto the arrivals curbside. Diversity in Contracting Design will be completed utilizing an existing Indefinite Delivery Indefinite Quantity (IDIQ) contract that has a commitment for 10% WMBE participation. It is anticipated that Port Construction Services (PCS) will complete all construction and will work with the Diversity in Contracting department to identify potential contract opportunities during this phase. Template revised January 10, 2019. COMMISSION AGENDA Action Item No. _8b_ Page 2 of 4 Meeting Date: July 27, 2021 DETAILS The project is located at the south end of the departures drive. However, construction will impact both the arrivals and departures drives. The new storm drainage facilities are planned to connect into the existing facilities along the arrivals drive. However, there is risk that existing power and communication infrastructure may prohibit that connection or require modification at significant additional cost in order to connect into that system. Utility potholing during design will determine the extent and impact of these constraints. Scope of Work This project will correct a failure of the existing storm drainage facilities at the south end of the departures drive. (1) Remove and replace an existing catch basin on the departures drive. (2) Install new storm drainage piping under the departures drive, down an existing column and across the arrivals drive to an existing catch basin. (3) Replace three existing expansion joints on departures drive. (4) Repave the existing departures drive shoulder and reseal the structure joint to direct stormwater flow into the new catch basin. Schedule Design start 2021 Quarter 4 Commission construction authorization 2022 Quarter 3 Construction start 2023 Quarter 1 In-use date 2023 Quarter 2 Cost Breakdown This Request Total Project Design $500,000 $500,000 Construction $0 $1,380,000 Total $500,000 $1,880,000 ALTERNATIVES AND IMPLICATIONS CONSIDERED Alternative 1 - Do not complete improvements. Cost Implications: $0 Pros: (1) Least costly alternative. Cons: (1) Rental car customers will continue to experience poor customer service. (2) Water intrusion will continue to deteriorate the departure drive structure. Template revised June 27, 2019 (Diversity in Contracting). COMMISSION AGENDA Action Item No. _8b_ Page 3 of 4 Meeting Date: July 27, 2021 This is not the recommended alternative. Alternative 2 Remove and replace all concrete traffic barriers (spandrels) and reconstruct the existing stormwater drainage system to replicate the existing system that is integral to the structure. This option includes replacing three local expansion joints. Cost Implications: $7,710,000 Pros: (1) Provides long-term repair of inoperable stormwater drainage system. (2) Improves customer safety and satisfaction. Cons: (1) Most costly alternative. (2) New stormwater drainage system will continue to be integral to the drive structure which is difficult to access and maintain. (3) Construction will result in significant impacts to both departures and arrivals curbsides. This is not the recommended alternative. Alternative 3 Install new storm drainage infrastructure that is external to the departures drive, replace existing expansion joints, and repave the departures drive shoulder and reseal the structure joint. Cost Implications: $1,880,000 Pros: (1) Provides long-term repair of inoperable stormwater drainage system. (2) Improves rental car customer safety and satisfaction. Cons: (1) The existing stormwater drainage system is integrated into the departures drive bridge deck. However, the new stormwater drainage system will be external and attached underneath the bridge deck. (2) Connection point is also an unknown project risk to be evaluated during design. This is the recommended alternative. FINANCIAL IMPLICATIONS Cost Estimate/Authorization Summary Capital Total COST ESTIMATE Original estimate $600,000 $600,000 Current change $1,280,000 $1,280,000 Revised Total $1,880,000 $1,880,000* Template revised June 27, 2019 (Diversity in Contracting). COMMISSION AGENDA Action Item No. _8b_ Page 4 of 4 Meeting Date: July 27, 2021 AUTHORIZATION Previous authorizations $50,000 $50,000 Current request for authorization $500,000 $500,000 Total authorizations, including this request $550,000 $550,000 Remaining amount to be authorized $1,330,000 $1,330,000 *Project alternatives were analyzed during status I, however the estimates from those alternatives inadvertently were mixed up. The effect was the correct alternative, but the wrong budget was approved. This revision reflects the budget for the approved alternative. Annual Budget Status and Source of Funds This project, CIP C801036, was included in the 2021-2025 capital budget and plan of finance with a budget of $600,000. A budget of $1,280,000 was transferred from the Aeronautical Reserve CIP (C800753) resulting in zero net change to the Aviation capital budget. The funding source will be 2021 revenue bond and the Airport Development Fund (ADF). Financial Analysis and Summary Project cost for analysis $1,880,000 Business Unit (BU) Roadways 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 less than $.01 in 2024 Future Revenues and Expenses (Total cost of ownership) This project will not have a significant impact on Aviation Maintenance annual operating and maintenance (O&M) costs. The storm drain will replace an existing system that is no longer functioning. ATTACHMENTS TO THIS REQUEST (1) Presentation slides PREVIOUS COMMISSION ACTIONS OR BRIEFINGS None Template revised June 27, 2019 (Diversity in Contracting).
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