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The Stormwater Management Stormfilter Revised Level 3 Stormwater Treatment Engineering Report Northwest Container Services – Tacoma Facility 1801 Taylor Way Tacoma, Washington 98409 Pierce County Site Operator: Northwest Container Services, Inc. Permit Number: WAR126969 Permit Type: Industrial Stormwater General Permit Prepared by: PBS Engineering and Environmental Inc. 415 W 6th Street, Suite 601 Vancouver, Washington 98660 Revised: December 13, 2018 PBS Project 17635.007 415 W 6TH STREET, SUITE 601 VANCOUVER, WA 98660 360.695.3488 MAIN 866.727.0140 FAX PBSUSA.COM Level 3 Stormwater Treatment Engineering Report 1801 Taylor Way Northwest Container Services, Inc. Tacoma, Washington Table of Contents Industrial Stormwater General Permit S8.D.3.a References ........................................................................................................ iii General Information ....................................................................................................................................................................................iv 1 INTRODUCTION .............................................................................................................................................. 1 2 FACILITY ASSESSMENT .................................................................................................................................. 2 2.1 Facility Description .................................................................................................................................................................... 2 2.2 Surface Water Drainage .......................................................................................................................................................... 2 3 TREATMENT ALTERNATIVE EVALUATION................................................................................................... 3 3.1 Water Quality Characterization ............................................................................................................................................ 3 3.2 Hydrologic Analysis .................................................................................................................................................................. 4 3.3 Treatment Alternatives ............................................................................................................................................................ 4 3.3.1 Alternative 1 .................................................................................................................................................................... 5 3.3.2 Alternative 2 .................................................................................................................................................................... 5 3.4 Treatment Alternatives Expected Performance ............................................................................................................. 5 3.5 Preliminary Cost Estimates..................................................................................................................................................... 7 4 PROPOSED STORMWATER TREATMENT IMPROVEMENTS ....................................................................... 8 4.1 Selected Treatment BMP and Sizing Calculations ........................................................................................................ 8 4.2 Treatment Process and Operation ...................................................................................................................................... 8 4.3 Use of Chemicals in the Treatment Process .................................................................................................................... 9 4.4 Expected Treatment Performance....................................................................................................................................... 9 4.5 Oil and Grease........................................................................................................................................................................... 10 5 CERTIFICATION BY A LICENSED PROFESSIONAL ENGINEER ................................................................... 11 Revised: December 13, 2018 i PBS Project 17635.007 Level 3 Stormwater Treatment Engineering Report 1801 Taylor Way Northwest Container Services, Inc. Tacoma, Washington Supporting Data TABLES Table 1: Water Quality Characterization of NW Container Tacoma Stormwater (Q2 2013–Q4 2018) Table 2. Investigatory Sample Results Table 3. Selected Design Flow Rates for Basin 1 Table 4. Summary of Projected Pollutant Reduction for Alternative 1 Table 5. Summary of Projected Pollutant Reduction for Alternative 2 Table 6: Treatment Technology Preliminary Cost Estimates Table 7. Summary of Projected Pollutant Reduction for the Proposed Basin 1 Treatment System FIGURES Figure 1. Vicinity Map Figure 2. Site Map Figure 3. Plan View: Proposed Basin 1 Treatment System Figure 4. Flow Diagram: Proposed Basin 1 Treatment System APPENDICES Appendix A: Investigatory Sample Results Field Forms Laboratory Analysis Reports Appendix B: Western Washington Hydrology Model Results Appendix C: Conceptual Designs for Basin 1 Alternatives Alternative 1 Alternative 2 Appendix D: Detailed Cost Estimates Alternative 1: Two-Stage Contech StormFilter Alternative 2: Enhanced Media Filtration System Appendix E: Contech Provided Studies Evaluation of the Stormwater Management StormFilter for the Removal of SIL-CO-SIL® 106, a standardized silica product: ZPGTM StormFilter cartridge at 28 L/min (7.5 gpm) Environmental Technology Verification Report, Stormwater Source Area Treatment Device, The Stormwater Management StormFilter® Using ZPG Filter Media ©2018 PBS Engineering and Environmental Inc. Revised: December 13, 2018 ii PBS Project 17635.007 Level 3 Stormwater Treatment Engineering Report 1801 Taylor Way Northwest Container Services, Inc. Tacoma, Washington Industrial Stormwater General Permit S8.D.3.a References S8.D.3.a The Engineering Report must include: Report Section i. Brief summary of the treatment alternatives considered and why the proposed option was Sections 3.3, 3.4, and selected. Include cost estimates of ongoing operation and maintenance, including disposal of 3.5 any spent media; ii. The basic design data, including characterization of stormwater influent, and sizing Sections 3.1, 3.2, and calculations of the treatment units; 4.1 iii. A description of the treatment process and operation, including a flow diagram; Section 4.2 iv. The amount and kind of chemicals used in the treatment process, if any. Note: use of Section 4.3 stormwater treatment chemicals requires submittal of Request for Chemical Treatment Form; v. Results to be expected from the treatment process including the predicted stormwater Sections 3.4 and 4.4 discharge characteristics; vi. A statement, expressing sound engineering justification through the use of pilot plant data, results from similar installations, and/or scientific evidence that the proposed treatment is Section 4.4 and 5 reasonably expected to meet the permit benchmarks; and vii. Certification by a licensed professional engineer. Section 5 Revised: December 13, 2018 iii PBS Project 17635.007 Level 3 Stormwater Treatment Engineering Report 1801 Taylor Way Northwest Container Services, Inc. Tacoma, Washington General Information Name of Facility: Northwest Container Services – Tacoma Facility Location of Facility: 1801 Taylor Way Tacoma, Washington 98409 Type of Facility: Transportation, Storage, and Handling of Intermodal Containers Primary SIC Code 4731 (Arrangement of Transportation of Freight and Cargo) Primary NAICS 488510 (Freight Transportation Arrangement) Type of Permit: Industrial Stormwater – General Permit Permit Number: WAR126969 County: Pierce County Site Area: 305,216 square feet (7.01 acres) Impervious Area: 284,149 square feet (6.52 acres) Chief Official: Gary Cardwell Title: Division Vice President Site Contact Name: Bob Sherwood Site Contact Title: District Manager Telephone Number: 253.272.3134 Fax Number: 253.838.3745 Revised: December 13, 2018 iv PBS Project 17635.007 Level 3 Stormwater Treatment Engineering Report 1801 Taylor Way Northwest Container Services, Inc. Tacoma, Washington 1 INTRODUCTION PBS Engineering and Environmental Inc. (PBS) has prepared this engineering report to present the selection and design of stormwater best management practices (BMPs) at the Northwest Container Services, Inc. (NWCS), Tacoma facility in Tacoma, Washington (facility). The facility is operated by NWCS. The facility operates under coverage of an Industrial Stormwater General Permit (ISGP or Permit) issued by the State of Washington Department of Ecology (Ecology). The Permit was first issued on May 16, 2013, and reissued on December 3, 2014. In 2017, the facility triggered a Level 3 corrective action for total zinc per Permit Section 8.D at sample location OF1. It also triggered a Level 2 corrective action for turbidity per Permit Section S8.C at OF1; however, NWCS elected to install a Level 3 corrective action for turbidity in lieu of a Level 2 corrective action at OF1 as well. Therefore, this engineering report was written to address stormwater treatment measures that will address both total zinc and turbidity for Drainage Basin 1. This engineering report is consistent with the requirements set forth in S8.D.3.a of the Level 3 corrective action condition of the Permit. NWCS submitted a permit modification request to Ecology to extend the Level 3 deadline
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