When concrete slurry poured into sewer mainlines in a coastal condo development near Los Angeles, the crew had no idea they were about to block all the sewage flow from nearby Marina del Rey.
During ground stabilization work on the development, the general contractor bored into an unmarked sewer line. After unknowingly piercing the 10-inch line, the crew proceeded to pump a mix of cement and natural aggregates into the ground under pressure. It wasn’t until they had already poured more than 25 cubic yards of the slurry mix into what they thought was just very aerated soil that the mistake
