his 300 ft by 900 ft single story, slab-on-grade structure was built in 1971. Over time, the western portion of the building had settled up to 15 inches. This caused the heavy, pre-cast concrete wall panels to skew and tilt out of plumb up to 8 inches over their 30-ft height, stressing the roof system. The geotechnical evaluation showed a surficial layer of dense gravel extending a minimum of three feet below foot- ing level. Beneath this was a

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