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Montserrat ECD Policy - Government of Montserrat

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Kilarc Powerhouse and SwitchyardProposal for Disposition• Work includes removal <strong>of</strong> turbines and generators and all associated electrical and mechanicalequipment associated with the powerhouse and abandoning the structure in place.• Turbine pits will be filled with mass concrete or other suitable fill material and capped withconcrete.• All openings will be sealed and the tailrace backfilled to the confluence using local earth materials.• The building will remain in place; the long-term disposition <strong>of</strong> the structure needs to bedetermined.• The switchyard will be left in place as it is an integral part <strong>of</strong> the PG&E inter-connectedtransmission system.Cow Creek Development Decommissioning ProposalThe South Cow Creek watershed encompasses approximately 78 square miles (mi 2 ), including 53 mi 2 locatedupstream from the South Cow Creek Diversion Dam. The average annual run<strong>of</strong>f at the dam is 79,500 ac ft;on average, approximately 37 percent <strong>of</strong> the annual run<strong>of</strong>f is diverted to Cow Creek Powerhouse. Theestimated dependable generating capacity <strong>of</strong> the Cow Creek development is approximately 400 kW, and theestimated average annual energy generated is 12 million kWh.The Cow Creek Development features include:• Mill Creek Diversion Dam;• Mill Creek-South Cow Creek Canal;• South Cow Creek Diversion Dam and Main Canal;• Cow Creek Forebay Dam; and• Cow Creek Forebay, Penstock, and Powerhouse.The Mill Creek–South Cow Creek Canal diverts water from Mill Creek to South Cow Creek. From SouthCow Creek, the water is diverted to the South Cow Creek Main Canal and into Cow Creek Forebay. FromCow Creek Forebay, the water flows through a penstock to Cow Creek Powerhouse. The water is thendischarged from the powerhouse to Hooten Gulch where it flows to South Cow Creek.Mill Creek Diversion – Dam and Canal IntakeProposal for Disposition• Work includes the demolition and removal <strong>of</strong> materials from the site.• Demolition may require construction <strong>of</strong> a temporary channel diversion.Cultural Resources Inventory and EvaluationGarcia and Associates (GANDA)Kilarc-Cow Creek Hydroelectric Decommissioning Project 6 March 12, 2009

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