Arrived on its to perform work as proposed. Documented utility marks. While digging, found a concealed meter box full of gravel. Removed gravel, discovered an old buried DCVA. Explained findings to the customer. Removed existing 1” DCVA. Installed a new Watts 1” DCVA. We were not able to test due to the meter being locked. The city will have to come unlock the meter and the customer is responsible for having someone test the Backflow. Cleaned work area. Removed Febco model 850 Serial #1HA50951 Install Watts model LF007M1QT Serial #177774 Thank you for choosing CPI!