Volume 2: Draft Gorst Planned Action Environmental Impact Statement

GORST PLANNED ACTION EIS | AFFECTED ENVIRONMENT, SIGNIFICANT IMPACTS, AND MITIGATION MEASURESTable 3.3-3Assumed Land Use and Population Growth for GHG Emission Calculations Gorst Watershed, ExcludingGorst UGANet Increase 2010-2035 Compared toExisting ConditionsLand Use Type Existing 2035Single-family (dwelling units) 619 425Multifamily (dwelling units) 123 (18)Commercial (square feet) 87,500 862,436Light Industrial (square feet) 86,241 574,469Regional VMT Contributing to Regional Tailpipe EmissionsRegional photochemical smog issues in the Puget Sound region are caused largely by tailpipe emissions from carsand trucks traveling on public roads. For this analysis it was assumed the relative amounts of regional tailpipeemissions caused by each alternative would be proportional to the regional VMT caused by each alternative.For purposes of assessing the potential air quality impacts, the regional VMT generated by the various land usecategories within the Gorst UGA for each alternative was estimated using the factors embedded in the King CountyGHG emissions estimation spreadsheet (King County 2011). These baseline VMT factors were reduced further on acase-by-case basis for each alternative to account for Kitsap County development strategies aimed at pedestrianaccess and increasing development density. The adjusted VMT factors for the key land use categories of interest inthe Gorst UGA are as follows:• Single-family housing: 64.5 daily VMT per dwelling unit• Multifamily housing: 44.8 daily VMT per dwelling unit• Commercial (Office) buildings: 44.28 daily VMT per 1,000 square feet• Industrial buildings: 19.37 daily VMT per 1,000 square feetThe development-related adjustment factors are described in greater detail later in this section. The proceduresfor deriving the development-related reduction factors are presented in Appendix C Air Quality GHG DevelopmentReduction Procedures & Sea Level Rise Information.GHG EmissionsFor the purposes of this analysis, the GHG emissions are expressed in terms of their increase between future landuse if there were no action taken and future proposed land use conditions in the Gorst study area based on theaction alternatives. Alternative 1 represents the future no-action scenario that is used as the basis of comparisonto evaluate future GHG emissions from the action Alternatives 2 and 3. The emissions estimate for future land useconditions accounts for GHG emissions reductions expected as a result of existing City of Bremerton and KitsapCounty land use development goals and policies within each jurisdiction’s Comprehensive Plan.An increase in GHG emissions exceeding 10,000 metric tons per year (future action alternative compared to futureno build alternative) was considered to be significant. To evaluate the significance of the estimated GHG emissionincreases for Alternative 2, the relative future increase compared to the future no-action alternative (Alternative 1)was compared to the Washington state GHG reporting threshold for stationary industrial sources. WashingtonState GHG reporting rules (WAC 173-441-030) require that industrial facilities with stationary emission units reportannual GHG emissions if they exceed 10,000 metric tons CO2-equivalent per year. This reporting threshold is notdirectly applicable to the Gorst UGA because the rule regulates only stationary industrial sources; whereas, theestimated GHG emissions for the Gorst UGA calculated for the purposes of this evaluation are from community-Draft | June 2013 3-32