A common mistake in Wichita is treating a 25-foot excavation like a deeper basement in Kansas City. The local Wellington Formation shale looks competent on the auger, but it slakes fast when exposed to air and summer humidity. We have seen contractor-designed cuts lose face stability within 48 hours of a rain event, even when the initial slope looked dry. Our geotechnical team designs support systems specifically for Wichita subsurface conditions, combining test pits for visual logging of fracture spacing with triaxial testing to measure real drained strength parameters. Every design goes through a constructability review with the shoring contractor before the permit set leaves our office. The Arkansas River alluvium on the west side adds another layer of complexity: sand layers under artesian pressure that can blow into the excavation if wall toe penetration is too shallow. We design for that scenario from day one.
In Wichita's Wellington shale, an unsupported vertical cut can lose 40% of its shear strength within 72 hours of exposure. Design must account for that timeline.
