Contra Costa Rock Quarries

Port costa shale quarries, port costa, contra costa co , port costa shale quarries, port costa, contra costa co, california, usa a crushed stone specialty use shale quarry complex located in the se sec 10, t2n, r3w, mdm, 14 km 09 mile 4,700 feet sse of port costa owned by the port costa clay products company owned.

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