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Salton Sea Species Conservation Habitat. Workshop • June 10, 2010. Meeting Purpose. Provide Stakeholders the opportunity to guide the direction of the SCH Project. Agenda. Introductions Goals and objectives Critical screening criteria Construction challenges.

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Salton Sea Species Conservation Habitat

Workshop •June 10, 2010


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Meeting Purpose

  • Provide Stakeholders the opportunity to guide the direction of the SCH Project


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Agenda

  • Introductions

  • Goals and objectives

  • Critical screening criteria

  • Construction challenges


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Introduction of Presentation Team

  • Rick Davis – Davis Group

  • Arturo Delgado – California Department of Fish and Game

  • Ramona Swenson – ENTRIX, Inc.

  • Rob Thomson – ENTRIX, Inc.

  • Vince Thompson – Ducks Unlimited


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Species Conservation Habitat Project

Goals and Objectives


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Need for SCH Project

  • Declining surface water elevation will lead to loss of Salton Sea habitat

  • Increasing salinity will lead to fishery collapse

  • Fishery collapse will result in loss of forage base for fish-eating birds


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SCH Project Purpose

  • SCH will provide conservation measures while the Legislature determines long-term action

  • Provides replacement for some near-term habitat losses as sea levels decline

  • Target: piscivorous bird species present in 2010 and dependent on the Sea for:

    • Foraging – fishery resources

    • Essential habitat components – foraging, nesting, roosting, loafing

    • Viability of a significant portion of their population


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Goals and Objectives

  • Goal 1: Develop a range of aquatic habitats that will support fish and wildlife species dependent on the Salton Sea

  • Objectives

    • Provide adequate foraging habitat for piscivorous (fish-eating) bird species

    • Develop habitats required to support piscivorous bird species

    • Support a sustainable, productive aquatic community

    • Provide suitable water quality for fish

    • Minimize adverse effects to desert pupfish

    • Minimize risk of selenium

    • Minimize risk of disease/toxicity impacts


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Goals and Objectives

  • Goal 2: Develop and refine information needed to successfully manage the SCH Project through an adaptive management process

  • Objectives

    • Identify uncertainties in achieving the objectives

    • Design science-based means to test alternatives and reduce uncertainty

    • Develop and implement a monitoring plan

    • Develop a decision-making framework

    • Provide proof-of-concept for future restoration efforts


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Questions and Feedback

Goal 1:Develop a range of aquatic habitats that will support fish and wildlife species dependent on the Salton Sea

Goal 2:Develop and refine information needed to successfully manage the SCH Project through an adaptive management process

  • Do you agree with these goals and objectives?

  • Are we missing any others?


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Species Conservation Habitat Project

Critical Screening Criteria


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Screening Criteria

Two types of screening criteria

  • Exclusionary criteria

    • Factors essential to the successful completion of the SCH Project

  • Evaluative criteria

    • Factors considered in comparing Project components and alternatives

    • Not necessarily cause for elimination

      • Construction and operational costs

      • Environmental considerations

      • Other


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Critical Screening Criteria

  • Exclusionary criteria used to begin refining the range of potential sites

  • Exclusionary criteria are

    • Adequate water supply (quantity, quality, and seasonal availability)

    • Available water rights

    • Available land

  • Three general locations being considered


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Three Generalized Alternative Locations


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Available Land – Whitewater River


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Available Land – New River


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Available Land – Alamo River


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Questions and Feedback

  • Are these the right criteria?

  • Are there others we should consider?


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Species Conservation Habitat Project

Construction Challenges


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Construction of SCH Ponds

  • Construction may occur in areas between -228 and -234 msl

    • Exposed playa with high groundwater

    • Shallow flooded areas

    • Water a few feet deep


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Potential Site Conditions

  • Examples of conditions that may be encountered during berm construction

    • Exposed moist but relatively firm soils

    • Shallow flooded relatively firm soils

    • Shallow flooded soft mucky soils

    • Water a few feet deep with soft or firm soils

  • Examples of water control structure installation

    • Localized dewatering

    • Structure support in soft soils


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Receding Sea Water Surface


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Building Berms on Exposed Playa

Example – Moist, relatively firm soils

  • Equipment

    • Low ground pressure tractors with carry-all scrapers

  • Method

    • Excavate, haul and place with the same piece of equipment

  • Haul distance

    • Short to Medium

  • Relative cost

    • Low


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Low Ground Pressure Tractors


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Building Berms in Shallow Water

Example – Shallow water, relatively firm soils

  • Equipment

    • Excavators, low ground pressure dump trucks, bulldozers

  • Method

    • Excavate and load, haul with dump trucks, spread with dozers

  • Haul distance

    • Short to long

  • Relative Cost

    • High


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Excavator, Load, and Haul


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Dump and Spread


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Building Berms in Shallow Water

Example –Shallow water, soft mucky soils

  • Equipment

    • Amphibious excavators

  • Method

    • Excavate and drop

  • Haul distance

    • Adjacent

  • Relative Cost

    • High


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Amphibious Excavators


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Building Berms in Deeper Water

Example – 2 feet of water, soft or firm soils

  • Equipment

    • Derrick barge with clamshell bucket

  • Method

    • Excavate and drop

  • Haul distance

    • Adjacent

  • Relative Cost

    • Medium


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Derrick Barge Clamshell Bucket


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Layer Height Depends on Strength


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Hydraulic Dredge


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Site Dewatering


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Water Control Structure


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Structure Site Dewatering


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Structure Support in Soft Soils


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Functional Wetland Management


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Next Step – Design Considerations

Preliminary Geotechnical Investigation

  • Sample and test soils at potential project sites

    • Previous investigations have not sampled locations around the river deltas

  • Assess construction feasibility at potential sites

    Preliminary Berm Stabilization Alternatives

  • Examples of design solutions to be considered

    • Source of embankment material

    • Dewatering

    • Base stabilization with geogrids

    • Berm stabilization with geotubes


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Questions and Feedback

  • Are there other issues we should address?


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Contact Information

  • DFG Contact:

    Kim Nicol, Environmental Program ManagerCalifornia Department of Fish and Game78078 Country Club Drive, Suite 109Bermuda Dunes, CA 92203(760) 200-9178knicol@dfg.ca.gov

  • USACE Contact:

    Lanika Cervantes, Project ManagerSan Diego Section, Regulatory DivisionU.S. Army Corps of Engineers - Los Angeles District6010 Hidden Valley Road, Suite 105Carlsbad, CA 92011(760) 602-4838Lanika.L.Cervantes@usace.army.mil


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SCH Project Website

www.water.ca.gov/saltonsea


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USGS Ponds


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USGS Pond Construction


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