You have a required elevation (at “A”) of 104.25. A reading to the benchmark (elevation 101.10) has a backsite reading of 4.65. A frontsite at the grade you are checking (location “A”) has a reading of 1.50. What needs to be done?

You have a required elevation (at “A”) of 104.25. A reading to the benchmark (elevation 101.10) has a backsite reading of 4.65. A frontsite at the grade you are checking (location “A”) has a reading of 1.50. What needs to be done?