BECAUSE EVERYTHING RESTS ON YOUR EXCAVATION For 35 Years we have worked in Alberta as the premier excavation company. We have closed the busniess. With tremendous gratitude we recognize our team for doing it right for 35 Years. Each of you took pride in your work and it is because of what you did each day that has enabled Keystone to leave a void in the industry. Thank you to our subcontractor team as well, you were critical to what we did.