8b Terminal 18 Stormwater presentation
Date: February 13, 2018 Item No.: 8b Terminal 18 Stormwater Outfall Renewal and Replacement Marine Stormwater Utility Highlights Marine Stormwater Utility formed in 2014 to protect water quality of the Puget Sound Won AAPA Comprehensive Environmental Management Award Tenant fees about 15% lower compared to City's Utility fees System assessment & rehabilitation Obtain baseline conditions of entire system, due to be completed end of 2019 A dozen urgent repairs completed preventing safety & operational hazard Investments in the stormwater system Green Stormwater Infrastructure such as oyster shell barrels & rain garden Installation of tide gates Tenants expressed positive feedback on our efforts Highlights of work accomplished 2 Utility Revenue & Goals Utility Revenue Breakdown Assess all 78 miles of NWSA infrastructure by 2019 NWSA tenants Invest in asset Port rehabilitation to Port tenants improve water quality Collected $4.96 million in 2017, $5.33 million in 2018 Provide triple bottom line benefits 3 Terminal 18 Stormwater Drainage area roughly 175 acres (nearly 9 Safeco Fields) Most site drainage enters Duwamish East Waterway through 13 Port- owned outfalls Outfalls were installed ~50 years ago Largest active container terminal 4 T-18 Stormwater System East Waterway Outfall Locations 5 Existing Outfall Conditions Ponded water in the pipes Broken Pipes Missing tide gates Visible conditions under the dock 6 Current Assessment / Scope of Work Focus from last manhole to end of pipe Repair broken and cracked pipe Realign pipe grade or slope Install new tide gate valves New tide gate installation Current Conditions and Repair 7 Project Schedule Commission Authorizations Design & partial construction authorization - Q2 2017 Full Construction authorization - Q1 2018 Construction Activities Non-disruptive activities postponed until 2018 Repair and replacement construction phased between 2018 and 2020 Schedule phased over 4 years 8
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