Sorci Sess7 101309

Impact of Levee Cutoff Walls on Groundwater Recharge Presented By: Paul Sorci, PE

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sacramento River Location Sacramento River Farmlands Downtown Sacramento Groundwater Analyzed

Overview of Cutoff Walls ,[object Object],[object Object],[object Object]

Overview of Cutoff Walls ,[object Object],Cutoff Wall Permeable Sands Fine Grained Soils Fine Grained Soils

Overview of Cutoff Walls ,[object Object]

Cutoff Wall Construction ,[object Object],Permeable Sands Low Permeable Clay/Silt Levee/Blanket Layer Ground Surface 5’ Min. 6’ Wide Element 2’ Overlap

Cutoff Wall Construction ,[object Object],Previously Mixed Element Next Element Alignment Next Element

Cutoff Wall Construction ,[object Object],Slurry Injection at Auger Tips

Cutoff Wall Construction ,[object Object],Permeable Sands Low Permeable Clay/Silt Levee/Blanket Layer Ground Surface

Cutoff Wall Construction ,[object Object],Spoils Used for Mixing Consisting Mostly of Clay Excavated Trench Bentonite Slurry

Cutoff Wall Construction ,[object Object],Mixing Excavator Bentonite Slurry Mix of Soil, Cement, and Bentonite

Cutoff Wall Construction ,[object Object],Trench Backfill Trench Mix

Cutoff Wall Construction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Groundwater Affects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Groundwater Affects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Groundwater Affects ,[object Object],[object Object],[object Object],[object Object]

Groundwater Affects ,[object Object],[object Object],[object Object]

Station 70+00 85% Reduction Station 353+00 40% Reduction Cutoff Wall Tip in Fine Grained Soils Cutoff Wall Tip in Coarse Grained Soils

Groundwater Affects ,[object Object],[object Object],[object Object],Rainy Season – Groundwater Recharge

Groundwater Affects ,[object Object],[object Object],Difference in Groundwater Recharge Rainy Season

Summary ,[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sorci Sess7 101309

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Sorci Sess7 101309