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Contains Critical Energy Infrastructure Information <br /> Do Not Release 5 <br /> APPENDIX A <br /> Detailed Description of Security Measures and Recreation Site Access Changes <br /> As required by the Hydro Security Program ("HSP"),the Public Utility District <br /> No. 1 of Snohomish County("PUD"or"Applicant")hired an outside consultant to <br /> conduct a Vulnerability Assessment("VA") of the Henry M. Jackson Hydroelectric <br /> Project("Jackson Project"or"Project"). The VA identified Culmback Dam and the <br /> facilities located at the dam (the intake structure,outlet works,the microwave station and <br /> control building) as being most vulnerable to attack.3 Culmback Dam consists of a rock <br /> and earthern structure that impounds 153,260 acre feet of water forming the largest body <br /> of water in Snohomish County—a body of water which also serves as the primary water <br /> supply for seventy-five percent of Snohomish County. The dam's structure also includes <br /> release valves and control structures for the power intake tunnel. The power intake <br /> tunnel controls the flows to the powerhouse turbines that generate five percent of the <br /> PUD's electrical energy requirements. <br /> Culmback Dam is remotely located and,therefore, difficult to access quickly. It <br /> is seventeen miles from the City of Sultan,the closest municipality with law enforcement <br /> personnel who could respond to an emergency. The VA estimated law enforcement <br /> response time to Culmback Dam at approximately sixty minutes.4 No personnel are <br /> stationed at the dam on a regular basis for either work or security purposes, and the VA <br /> found that there were no measures in place to detect adversaries until they actually arrive <br /> 3 Jackson Hydroelectric Project, RAM-D Risk Assessment at 8-1 (2003) <br /> (hereinafter"VA"). <br /> 4 Id. at 4-5. <br /> 35 <br />