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HomeMy WebLinkAboutBradley Lake O&D Committee 01-22-2004organize its internal Bradley documents and cross-reference AEA's and HEA's drawing list. Slip Rings Timing: Immediately Budget request: $50,000.00 Capital Justification: These parts have a 6-7 month lead time for replacement necessitating the need for an on-site spare. Scope of Work: HEA will order and stock necessary spare parts. f- | Review aeronautical charts and FAA documents to ensure the airstrip is indicated as private, unattended. g- Review and reissue policy for personnel transport by air and use and operation of the Martin River Emergency Airstrip. Martin River Road and Airstrip Transport Study Timing: Spring 2003 Budget request: $10,000.00 Justification: The airstrip has not been used, maintenance costs are high, increasing, and ongoing, it is difficult to maintain and monitor from the project, there is liability associated with continued maintenance of an unmanned airstrip, and other lower cost alternatives may be available for the project. See attached information describing the advantages and disadvantages of removing or maintaining the Martin River Road. If the study identifies suitable transport alternatives, an amendment to the FERC permit requesting approval to remove airstrip and access road from the project will be considered. Scope of Work: Evaluate transport alternatives to the Martin River airstrip. Alternatives include helicopter access, developing a written no-fly policy in certain wind and weather conditions, vehicle/boat, and US Coast Guard in emergency conditions. FEMA Funding: No On-Site Civil Project Manager Timing: Summer 2003 Budget request: $48,000.00 Justification: HEA staff will be focused on Needle repair job and other ongoing maintenance activities. Additional temporary staffing is needed due to the large amount of Civil work and activities. FEMA Funding: No Scope of Work: Manage Civil work and coordinate logistical related project activities. Digitize and Control Project Drawings and Manuals Timing: Ongoing Budget request: $50,000.00 Justification: Drawings can be digitized for approximately $3-5/drawing. This effort will ensure better records can be maintained, utilized, and managed during upcoming major construction project on Governor. Scope of Work: HEA will coordinate digitization effort and will extend existing document control procedures to manuals. Under a separate budget line item, AEA will Kachemak Creek Gauging Station Timing: Spring/Summer 2003 Budget request: $26,000.00 Justification: Improve inflow forecasting. FEMA Funding: No Scope of Work: A new precipitation gauge monitoring site at Kachemak Creek would allow for more accurate flow predictions of water available for power generation. Kachemak Creek is the largest flow input into the Bradley Lake. Additional upgrades would be made to sites to allow real-time data monitoring. Martin River Road and Airstrip Repairs Timing: Summer 2003 Budget request: $100,000.00 Justification: Minimum FERC required work. Additional work is being deferred in consideration of the possibility that the road will be removed. FEMA Funding: Partial FEMA reimbursement possible for items a and b. Scope of Work: The Martin River road and Airstrip must be maintained, as it is a licensed project feature. If policy changes take away the need for the Airstrip, it can be taken out of service and abandoned contingent on FERC approval. If the decision is made to abandon the airstrip, maintenance of the road and airstrip will be required until the FERC license is amended. a- Perform remedial work to correct subsidence/sinkholes in roadbed at East and West approaches to the Battle Creek Bridge and re-grade the approaches. b- Perform erosion control work at left (West) abutment of Battle Creek bridge; place rip rap and/or armor stone protection along left bank of waterway approach area to prevent further erosion of embankment and to improve the hydraulic conditions at entrance to bridge waterway. c- Remove brush and trees within the aircraft operations safety area and safety clearance surface limits along runway and at ends of runway. d- Install signs indicating private airstrip. e- _ Review and revise maintenance policy/procedures regarding the emergency airstrip. Airstrip should be inspected regularly as part of the project features inspection such as when project staff drive to the dam for the regular inspection when the road to the dam is open. Aerial inspections of the project should include a swing by the airstrip. Battle Creek Repairs Timing: Summer 2003 Budget request: $10,000.00 Justification: Economic benefit of additional water input to reservoir. FEMA Funding: No Scope of Work: Battle Creek diverts to Bradley Lake just below the falls. The diversion dike has deteriorated near the base of the falls and allows a large amount of water at high flows to flow to the old channel away from Bradley Lake. Either repairing this dike or making a modification in the bedrock channel near the base of the falls will ensure water is diverted to Bradley Lake at all flow levels. The scope consists of the following: a- Perform remedial work on Battle Creek Falls to train water into the diversion channel. This is work that can be done by a crew of laborers in a few days. Middle Fork Diversion Timing: Summer 2003 Budget request: $20,000.00 Justification: FERC required. FEMA Funding: No Scope of Work: The Middle Fork Diversion is experiencing erosion at the right bank of the channel below the downstream (lower) drop structure stilling pool. The stream is confined in a channel constructed through bedrock but the banks of the channel downstream from the lower drop structure are composed of soil materials overlying bedrock. The soil materials are being eroded at high stream stages. The erosion may or may not be a problem depending on where bedrock is relative to the eroded bank surface. There is no immediate danger to the diversion channel at this time but the erosion needs to be monitored. Also, the bedrock surface needs to be located by use of seismic techniques. If the bedrock surface is not close to the present limits of erosion, then erosion protection work will be required in the near future. If the bedrock is hear the erosion limit then it would be practicable to let the erosion advance to the bedrock. The scope consists of the following: a- Continue to monitor the erosion situation by visual inspection on several occasions in Summer 2003. b- Perform seismic survey to locate bedrock in the erosion zone during summer of 2003. c- Evaluate erosion after observations and seismic information is in hand and design erosion control program if needed. flows over the bank to the downstream side of the dam. Divert this water to the reservoir for power production. h- Only if needed and based on results of prior work, consider relocating the Stop-Log and Float storage to near the Gatehouse. This is optional and will depend on what is done to grade and stabilize the embankment on the reservoir side of the pad. If the embankment slope is not rip rapped and the stable slope cuts into the safety margin of the pad, then the practicable solution to stop-log storage would be to construct a new pad near the gatehouse and move the stop-logs. Nuka Diversion Timing: Summer 2003 Budget request: $50,000.00 Justification: Based on last available data, if Nuka drainage flows were reduced so that only the required minimum of 5 cfs were released to the Nuka River, an additional 2100 acre feet of additional water with a value of $63,000.00 to $126,000.00 could be diverted to the project for power generation. Nuka repairs will be needed every 3-5 years and this repair is part of normal maintenance activities. FEMA Funding: Partial FEMA reimbursement possible items a-c. Scope of Work: The Nuka Glacier melt water pool moraine is constantly changing. This results in the outlet channel to Bradley Lake having variation in flows from month to month and year to year that is mainly due to how much the morainal deposits have shifted in a given time period. Ice damage to the Nuka Diversion structure that controls flow to the NPS lands to the East of the Nuka Pool has resulted in loss of gabion training walls and structure downstream from the Nuka Diversion Structure. Also the operating handle on one of the bypass valves (shear gate) has been either taken away by ice or dropped to the bottom of the diversion forebay. Both bypass pipes are operating at higher than minimum required flow so it is thought the valves are both full open. The scope consists of the following: a- Repair Diversion Weir gabions and downstream training walls. b- Recover the missing valve operating handle and check condition of shear gates. Perform remedial maintenance if required. c- Restore diversion channel to Bradley Lake from Nuka Pool. This will require either a labor crew with shovels if the amount of material to move is minimal, or a tracked excavator if the amount of material is large. Timing/Justification/Details: Bradley Lake Dam Left Abutment Area Repairs Timing: Spring/summer 2003 Budget request: $100,000.00 Justification: Items a-f - FERC required work Item g - Economic benefit of additional water input to reservoir Item h - Will only be done if prior work indicates the need FEMA Funding: Partial FEMA reimbursement possible items a-d. Scope of Work: a- b- Restore and re-grade the maintenance access bench along the left abutment area. Grade embankment upper slopes in area affected by wave erosion during high reservoir in November 2002. This is to remove dangerous steep embankment section at the top of the slope where the embankment was undercut by wave erosion during the high reservoir condition. Armor the embankment above the maintenance bench with either rip rap or the ENKA-mats from the old construction camp storage area or with riprap to prevent further wave erosion. After grading the upper embankment slope this may be found not to be required. A seismic survey of the area will be done to determine where bedrock surface is relative to the slope surface and stop-log storage pad. It may be practicable to simply re-grade the slope and allow erosion to reach equilibrium rather than rip rapping the slope. Remedial grading of the slopes below the maintenance access bench as required and place small riprap to fill any depressions and holes around large riprap as required to reduce erosion and improve the surface for equipment operation. Continue annual trash removal efforts with modified removal procedures. Remove “floating trash” using existing equipment, bulldozer and loader, but do not run equipment on newly graded embankment. Instead remove material using winch and/or additional summer staff as required. Perform a seismic survey of the area adjacent to the stop-log storage area to determine location of bedrock. Using HEA staff and project equipment, grade the main access road to the dam to create positive drainage collection and control for surface runoff in the area West of the gatehouse. Runoff from the area above the rock cut and from up grade on the road collects along the toe of the rock cut and To: Bradley Lake BPMC From: O&D Committee Date: 1-22-04 The Bradley Lake O&D Committee requests the following extraordinary maintenance, operating, and capital expense for the 2004 budget: Summary: Budget Item Budget Request | Timing Bradley Lake Dam Left $100,000.00 Spring/Summer 2003 Abutment Area Repairs Nuka Diversion Repairs $50,000.00 Summer 2003 Battle Creek Repairs $10,000.00 Summer 2003 Middle Fork Diversion $20,000.00 Summer 2003 Repairs Kachemak Creek Gauging | $26,000.00 Summer 2003 Station Martin River Road and $100,000.00 Summer 2003 Airstrip Repairs Martin River Road and $10,000.00 Spring 2003 Airstrip Transport Study On-Site Civil Project $48,000.00 Spring 2003 Manager Digitize and Control Project | $50,000.00 Spring 2003 Drawings and Manuals DSM Upgrade $50,000.00 Summer 2003 Slip Rings $50,000.00 Capital | Spring 2003 Total 2004 O&D $464,000.00 Committee O&M Budget requests: Total 2004 O&D $50,000.00 Committee Capital Budget requests: