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GRASS VALLEY, January 12, 2017 – Engineering firm Holdrege & Kull shared their aerial video showing a sinkhole caused by a damaged culvert on Wolf Creek in Grass Valley, CA.
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GRASS VALLEY, January 12, 2017 – Engineering firm Holdrege & Kull shared their aerial video showing a sinkhole caused by a damaged culvert on Wolf Creek in Grass Valley, CA.
