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ESA Scope of Work Bowers Field Environmental Assessment -Environmental Services June 2018 Assumptions The cost estimate was developed with the following assumptions: • The direct study area is defined in the scope of work as the "area which encompasses the entire construction footprint for airport improvements associated with the projects" and is shown in red on the exhibit provided by Century West. This includes two rectangular areas identified for hangar taxilane construction located south of Runway 7-25 and the three rectangular boxes drawn around the two runways (7-25 and 11-29) and proposed taxiway (Taxiway F). • The total direct study area is approximately 137.7 acres including developed runways and taxiways. • Field work will be conducted using a two-person crew for four field days. • Field work will require three overnight stays near the airport. • ESA will flag wetland boundaries in the field using a combination ofribbon and pin flags. • ESA will record flag locations with a GPS unit equipped with external antennae. ESA will not conduct a professional survey of flag locations. If a formal survey is required, then this would need to be done by a professional land surveyor. • ESA will complete wetland rating forms per Ecology's Wetland Rating System for Eastern Washington (2014 Update) to support state and local permitting. • ESA assumes that Century West will prepare the EA and is responsible for coordinating and delivering the appropriate information to the Airport and FAA per the project schedule. • ESA's work on Tasks 4.3 (Prepare Draft EA) and 4.6 (Response to Comments) will cover only the EA sections assigned to ESA, which includes Air Quality, Biotic Resources, Federally Listed Endangered and Threatened Species, Greenhouse Gas (GHG) Emissions/Climate, Water Quality, and Wetlands. • ESA assumes that all comments on work products will be delivered in a single, consolidated set, and will be provided in a timely fashion. 8