Earthwork Take-Offs & GPS Models Are Our Business. It’s what we do all day every day and we make it a priority to stay at the forefront of the latest technology. With DirtLogic’s expertise and sophisticated system of checks and balances, there is nothing left to chance. We provide detailed and user-friendly information for your project with an average turn-around time of one to three days. Founded in 2001, our clients range from local excavation contractors to multi-national development firms. Our talented group of take-off and GPS model technicians are highly skilled and undergo more than six months of training before operating independently. No matter how complicated or time-sensitive the job, we don’t consider it done until you are completely satisfied.