We are looking at installing a deep(50') 10' diameter cmp fish pass culvert. Considering installing in 2 stages so we can keep 2 lanes of traffic and a bike path open. I am looking for ideas on how to temporarily shore up the excavation longitudinally along the centerline of the highway. I am working with a cut approx. 45 feet deep in Sandy gravel soils, with traffic loading along top of cut. Any tips would be greatly appreciated.
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