Volume 2: Draft Gorst Planned Action Environmental Impact Statement

GORST PLANNED ACTION EIS | AFFECTED ENVIRONMENT, SIGNIFICANT IMPACTS, AND MITIGATION MEASURESTable 3.13-4Comparison of Added Impervious Area in Gorst UGALand Alternative 1 2 Alternative 2 Alternative 3Vacant and Underutilized Acres, excluding critical areas 1 74.0 117.1 117.1Estimated Impervious Acres 51.3 68.0 68.8Share of Developable Acres in Impervious Surfaces (percentage) 69 58 59Note:1 This includes land that could be used for rights of way and public facilities and is not discounted for market factors.2Includes Kitsap County owned property on Sinclair Inlet, assuming a lower impervious area consistent withSource: BERK 2013park/open space assumed in Alternatives 2 and 3.Restoration may be limited to stormwater retrofit actions. However, restoration of in-stream alterations (removalof channel armoring, berms) and re-establishment of natural stream structure (i.e., reducing channelization in thelower reaches of the stream) may be appropriate given that upstream processes for the northern half of thewatershed are relatively intact.Alternative 1Growth in the Gorst UGA would be served by current water service providers, which have adequate capacity forgrowth.Wastewater deficiencies were addressed following the installation of the collection system in 2010. Theinstallation of new wastewater mains in 2010 has allowed residents to abandon on-site septic systems in areassusceptible to failure due to saturated soils and flooding. However, given the gradual increase in demand,extension of service would be needed for new development.New stormwater standards would not be adopted, and deficiencies would continue to be unresolved underexisting stormwater plans. However, Kitsap County’s CFP would eventual incorporate measures for addressingdeficiencies. Runoff during storm events would continue to cause sheet flow over roads and discharge directly tostreams and water bodies including Gorst Creek and Sinclair Inlet. The increase in development, particularly fromcommercial development would also likely increase impervious surfaces. Table 3.13-4 Comparison of AddedImpervious Area in Gorst UGA above indicates an increase in about 51.3 acres of impervious area.Future utility needs from the increase in 742 jobs and a population growth of 82 persons over the next 20 to 30years would be addressed through incremental capital facility planning.Overall, the effects on utilities under the Alternative 1 would be moderate from the long-term higher frequency ofmaintenance on aging utility infrastructure and untreated stormwater discharging directly to fish-bearing streamsand estuarine wetlands in Sinclair Inlet.Alternative 2Under the Alternative 2, a regional commercial center corridor along the waterfront would be developed, theWatershed Characterization & Framework Plan would be adopted, and clustered Medium Density Residentialdevelopment would occur. Construction activities associated with Alternative 2 could result in minor short-termdisruption of service.Similar to Alternative 1, the City of Bremerton would continue to provide clean drinking water to the residents ofthe UGA. The Gorst UGA would be served by current water service providers, which have adequate water sourcecapacity for growth. New development at the mine site would require developer installed improvements foradequate distribution of drinking water.Draft | June 2013 3-231