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Decision: <br /> Deny the appeal and affirm the mitigation requirements for stormwater pollution avoidance and <br /> treatment, and stormwater quantity control as set forth in Conditions II.0 (page 4) II.F. (page 4-5), <br /> V.A.4. (page 14), V.B.1.b.(3) (page 19), V.B.3.b.(1), and V.B.4.b.(2) set forth in the Decision <br /> Document. <br /> SECTION 11: INDIRECT SURFACE WATER IMPACTS <br /> Findings: <br /> • The addition of impervious surface area on the site resulting for construction of new <br /> buildings, roadways, parking and storage areas will increase the amount of stormwater <br /> runoff to receiving streams. <br /> • The proposed action does not include the construction of any impervious surfaces offsite <br /> other than that required by traffic mitigation measures. Increased offsite impervious <br /> surfaces would result from offsite residential and commercial development which will be <br /> subject to appropriate reviews and regulatory requirements. <br /> • Boeing is required by the City's Storm Drainage Ordinance (Ordinance 514-78 as <br /> amended), Powder Mill Gulch Drainage Basin Plan, Japanese Gulch Drainage Basin <br /> Plan, and the Decision Document to control stormwater quality and quantity leaving the <br /> Boeing site. <br /> • Policy 1.C. Water of the City's SEPA Ordinance (Ordinance 1348-87) states that it is the <br /> City's objective to, "...encourage development and construction procedures <br /> which...minimize surface water and groundwater runoff and diversion and to minimize <br /> erosion and reduce the risk of slides." It further states that it is the objective of the City <br /> to encourage development and construction procedures, "...which respect and preserve <br /> the City's water courses..." (emphasis added). <br /> • The increase in employment from approximately 24,000 to 33,500 on-site will result in <br /> an increase in direct and induced population as identified in the DEIS, including DEIS <br /> Appendix I, and the FEIS. This population increase will generate residential, <br /> commercial and industrial development in the region. The resulting development will <br /> likely increase the amount of impervious surface and increase stormwater runoff in the <br /> areas where that development occurs. <br /> • The State has provided local jurisdictions with the responsibility and legal authority to <br /> address the stormwater impacts resulting from developments within their jurisdictions. <br /> 19 <br />