A CAT 345C Hydraulic Excavator scoops big piles of dirt and drops them into double trailer dump trucks (aka transfer dump trucks) to haul away. Also check out http://youtu.be/oHmZvtXZsNg for a fun video from this same construction site that make these trucks look like toys! More videos from this construction site will follow soon. Subscribe to Trucksamuck's Channel to be notified when they are uploaded: http://goo.gl/jUubJb