2600 FEDERAL AVE 2021 PORT OF EVERETT 2025-09-29

1q:1 Consulting Engineers Page 2 of 13 1.0 Introduction This storm drainage control report has been prepared for the Port of Everett's Maritime Industrial Expansion project — Norton Terminal (site). The report has been prepared in conformance with the requirements of the 2019 Stormwater Management Manual for Western Washington as prepared by the Washington State Department of Ecology. The site is located north of the Port's secure Seaport facility at 2600 Federal Avenue in Everett, Washington. After completion of this project, the Norton Terminal will be incorporated into the Port's secure Seaport facility. Site entry will require a Transportation Worker Identification Credential (TWIC)or authorized escort. The Norton Terminal facility is bound to the north by the City of Everett Port Gardner Stormwater Facility,to the south by Federal Avenue and Port of Everett Terminal,to the east by the BNSF Railroad and City of Everett and to the west by Port Gardner Bay. Refer to Appendix A, Figure 1 for a Vicinity Map. The project consists of developing the Norton Terminal to increase the Port's existing cargo handling capabilities and storage. Improvements include the installation of a paved cargo laydown yard, ingress and egress gates,allowance for future railroad sidings,and utilities including water,sewer, power,lighting and communications, storm drainage infrastructure and treatment, and infrastructure for storage of containers and breakbulk cargo.The stormwater improvements include the installation of a collection and conveyance system consisting of concrete gutters, trench drains, stormwater pipes, catch basins, manholes, and water quality treatment systems. This project is located at the former Kimberly-Clark (K-C) site and is classified as a third interim cleanup action as part of the state's Model Toxics Control Act (MTCA) permitting. The Property is owned by the Port and is on the Washington State Department of Ecology's (Ecology) list of contaminated sites and is currently in the MTCA cleanup process. The site is listed in the Ecology database of confirmed and suspected contaminated sites under Cleanup Site ID 2569.This memorandum is submitted for substantive requirement review by the City (accompanying drawing package submittal to Public Works), per agreement between Port and City regarding review of this MTCA cleanup project. 2.0 Existing Conditions Norton Terminal has recently completed its second round of interim action cleanup(December 2020)and will be starting its third interim action cleanup under an agreed order (Agreed Order No. DE 9476) between the Washington State Department of Ecology (Ecology) and The Port of Everett. The site is applying for coverage under the Washington State Department of Ecology under the National Discharge Elimination System (NPDES) Industrial Stormwater General Permit (ISGP). The site is located above the HTL and is roughly 45.37 acres of relatively flat surface consisting mostly of sand backfill from the cleanup action. The site area located above HTL is delineated into three basins identified as Basin M, A, and Future PUD Substation. Refer to Appendix A, Figure 2 Overall Storm Drain Basin plan for a delineation of each basin as well as Table 1: Existing Site Area Characteristics below.