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Re: [birdingSanDiego] [SanDiegoRegionBirding] Lindo Lakes construction project.

FYI: Bentonite is an extremely dense fine particle clay that is often used to create a lining in ponds, lakes, reservoirs to prevent water loss through percolation into the groundwater… so not concrete…

CK Staurovsky 
El Cajon

Source: SanDiegoRegionBirding Latest Reports