501 RIVERSIDE RD REGIONAL DISPOSAL COMPANY EVT TRANSFER FACILITY PHASE 1 SITE IMP 2025-07-28

1 pipe in the same locations. The collected water will discharge into the Snohomish River through the current 36"outfall. It is expected that,because the Phase 1 area has the greatest concentration of vehicular activity, the proposed paving and drainage system installation will significantly reduce turbidity in stormwater runoff. Additionally, stormwater pretreatment devices will be installed at the discharge points of the Phase 2 and Phase 3 areas. Sizing for the pretreatment facilities is ' included in Appendix C. No stormwater detention or water quality treatment is required for the project. The City of Everett Stormwater Management Manual exempts road maintenance practices that include "overlaying asphalt or concrete pavement with asphalt or concrete without expanding the area of coverage." The Everett Stormwater Management Manual is based in part on the 2005 Washington State Department of Ecology(DOE) Stormwater Management Manual for Western ' Washington, which provides for the same road maintenance exemption cited above. It is noted however that the 2012 DOE Stormwater Management Manual for Western Washington uses the term"Pavement Maintenance" in lieu of"Road Maintenance,"which leads to an understanding that"road maintenance" as used in the Everett manual is intended to cover pavement maintenance of the type proposed for Phase 1 of the project. Correspondence with the City regarding this agreement is included in Appendix D. ' On August 29, 2013,representatives of RDC and Reid Middleton met with Greg Stegman, an Environmental Specialist in the DOE Water Quality Program, and Jessica Engel, Stormwater ' Inspector with the same program. The purpose of the meeting was to familiarize Mr. Stegman and Ms. Engel with the site and to explain what improvements RDC intends to make to address the turbidity water quality problem. After explaining the Phase 1 improvements detailed in the ' narrative above, the RDC representatives proposed monitoring of stormwater quality through the winter following construction(winter of 2014-2015)to determine if stormwater discharges meet current DOE industrial permit stormwater standards. If violations of stormwater quality ' standards persist during the one winter of monitoring, RDC will install additional water quality treatment options to address the offending pollutants. Mr. Stegman stated that this proposal is acceptable to DOE. 1 1 1 Regional Disposal Company June 11, 2014 Everett Transfer Facility Reid iddleton Stoiinwater Site Plan - 5 -