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*.ft0FCENTURY I i' . <br />WEST '` <br />E N G I N E E R I N G <br />KITTITAS COUNTY - BOWERS FIELD AIRPORT <br />TO: CAYLA MORGAN, FAA <br />FROM: CENTURY WEST ENGINEERING <br />DATE: NOVEMBER 27, 2019 <br />RE: ADVANCED DESIGN NEEDS FOR NEPA ANALYSIS OF PROPOSED AIRFIELD IMPROVEMENTS <br />CC: MARK COOK, K[TTITAs COUNTY <br />CANDIE LEADER, KITTITAs COUNTY <br />MARY VARGAS, FAA <br />1. PROJECT BACKGROUND <br />Century West Engineering (CWE) is preparing an Environmental Assessment (EA) on behalf of Kittitas <br />County and Federal Aviation Administration (FAA) for a series of airport improvement projects intended <br />to accommodate current and forecast aircraft activity at Bowers Field Airport (ELN). The proposed <br />projects were originally defined in the Airport Master Plan and are depicted on the Airport Layout Plan <br />(ALP), which received final FAA approval in November 2018. An airfield flood mitigation project is also <br />being evaluated as part of the EA due to historical seasonal flooding experienced on the airport. The <br />proposed projects are as follows: <br />PARALLELTAxiWAY FOR RUNWAY 11/29 & CONNECTOR TAxiwAYs — This project involves construction of a <br />new full-length parallel taxiway adjacent to Runway 11/29 and associated connector taxiways <br />between the parallel taxiway and Runway 11/29. It also involves modification of existing Taxiway <br />F to resolve non-standard geometry and construction of a new taxiway between the Runway <br />11/29 parallel taxiway, Runway 7-25 and the terminal apron area. <br />RUNWAY 11/29 REHABILITATION &AIRFIELD FLOOD MITIGATION—This project will rehabilitate existing <br />Runway 11/29 to meet ARC B -Il design standards and eliminate an existing aligned taxiway at the <br />Runway 29 end. It will also make improvements to alleviate the occurrence of localized flooding <br />on Runway 11/29. <br />HANGARTAxILANES--This project will construct new hangar taxilanes to serve future hangar <br />developments south of the main apron area. <br />2. CURRENT EA SCOPE OF SERVICES <br />The current EA scope of services provides funding for National Environmental Policy Act (NEPA) analysis <br />and approximately 25 percent design for all project elements in support of this analysis. The current <br />scope includes five major tasks: 1) Project Management/Administration; 2) Proposed Action, Purpose and <br />Need, and Alternatives; 3) Environmental Permitting and Coordination; 4) Environmental Assessment; <br />and 5) DBE. The following discussion is intended only to outline portions of the current scope of work <br />which will require additional effort based on unforeseen circumstances uncovered during the initial <br />Bowers Field Airport Environmental Assessment Page 1 <br />Advanced Design Needs for NEPA Analysis November 27, 2019 <br />