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City of St HelenaUpper York Creek Ecosystem
Restoration Project
April 28, 2015St. Helena City Council Meeting
Background
Background• 1900 – Dam constructed
• 1930’s - Ceased use as a water source
• 1965 to 1992 – Four incidents of accidental, catastrophic release of sediment resulting in fish mortality
• July 28, 1992 – Accidental sediment discharge during maintenance results in complaint filed with Napa County District Attorney
Background• March 2002 – City formally abandons right to
divert water from York Creek into Upper York Creek Reservoir
• 2004 – Downstream diversion to Lower York Creek Reservoir removed
• February 2006 – Agreement with NOAA to pay $70,000, and $70 per day the dam is in place after December 1, 2009
• September 19, 2006 – Notice of Preparation of Draft EIR
Background• October 18, 2006 – Initial public comment period
closed and no comments received
• April 19, 2007 – City noticed for additional comments through June 4, 2007. No comments received.
• May 31, 2007 - No comments received. City noticed for additional comments through July 25, 2007
• July 26, 2007 – One comment received. City sent email to residents on Bieber Road and extended public comment period to August 29, 2007
Background• August 30, 2007 – City noticed for additional
comments through October 15, 2007.
• October 2007 – Public comment period extended to November 14, 2007, due to request from State Water Board
• September 2006 to October 2007 – Four public meetings were held
• August 2010 – Agreement with NOAA to remove the dam and establish fish passage. Beginning October 31, 2012, City will pay NOAA $70 per day that dam is in place.
Project Scope
• Modify dam to allow fish passage
• Remove accumulated sediment
• Maintain stability of Spring Mountain Road
Project Alternatives
• Full Removal
• Small Notch Alternative (preferred alternative)
• Fish Ladder
Project Alternatives
Project ScopeSmall Notch Alternative
DAM EMBANKMENT
Project ScopeSmall Notch Alternative
EXIST. GROUND (DAM)
PROPOSED GROUND
Project Scope
• Current funding:
Funding Source AmountSFWQIF $ 987,876
Proposition 84 IRWMP
$ 800,000
City Bond Funds $ 3,016,349Unidentified $ 1,695,775
Total Project Cost $ 6,500,000
Project Impacts• Significant and Unavoidable (4)
1. Aesthetics – Placement of soil at Lower Reservoir may result in a change in the water surface area as viewed from above
a) Mitigation – Plant native vegetation
2. Cultural Resources – Dam is considered eligible for listing in the National Register of Historic Places and California Register of Historic Resources.
a) Mitigation – Provide graphic and written documentation of the dam’s significance on the City’s website and displayed in a City building.
Project Impacts• Significant and Unavoidable (4)
3. Hydrology & Hydraulics – Sediment aggradation in Lower York Creek may increase the frequency and severity of flooding
a) Mitigation – implement a channel monitoring program, causative factors analysis, and program to improve channel capacity and promote sediment transport.
4. Noise – Temporary increase due to construction activities
a) Mitigation – Work during daylight hours and efficiently schedule activities to minimize hours of noise
Action• Open a public hearing for comment
• Certify the Environmental Impact Report
• Adopt CEQA Findings and Statement of Overriding Considerations
• Adopt Mitigation Monitoring and Reporting Plan
• Authorize staff to proceed with securing final funding and development of Project design and construction bidding documents
Future
• Identify and apply for grant funding to secure funding for current shortfall
• Prepare final design documents