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CHAPTER 6: NEXT STEPS 6.2 Preliminary connection methods to the interstate. While no new access points to 1-90 have been proposed Engineering during the feasibility study, modifying existing The selected alternatives (Alternatives 2 and access to accommodate additional lanes will be 3) discussed in Chapter 4 of this document will required. Future design work will include plan need to be further developed at a preliminary and cross-section views of the improvements design level to more accurately understand the and construction staging schemes to identify project footprint and potential environmental staging areas within or adjacent to the WSDOT impacts.As part of the preliminary design right-of-way. phase, a best-fit alignment and method of Preliminary engineering,typically at the 5% widening the corridor will be further evaluated. to 10% level will be developed to determine There are multiple areas along the 1-90 corridor that will require interim alternative potential environmental impacts,which is necessary in determining the level of assessments to determine the best methods for reducing environmental impacts and environmental analysis and documentation that will be required for the project. minimizing interruptions to the traveling public. The overall goal is to identify an initial Once the level of environmental analysis design footprint for the project to better and documentation is identified, engineering analyze environmental and traffic outcomes. design (typically developed to the 15%to 30% The design footprint will show the locations level) will move forward concurrently with the of improvements in the corridor, including environmental analysis. stormwater facilities, earthwork, and . .. FIT- UL - Z49 - VOLUME I: FEASIBILITY REPORT I-90 Corridor - Easton to Cle Elunn Feasibility Study 1 83