Apre-engineering baseline was run down a very steep hill. rather than measure horizontally downhill with the steel tape, the surveyor measures the vertical angle with a theodolite and the slope distance with a 200-ft steel tape. the vertical angle is -21° 26’ turned to a point on a plumbed range pole that is 4.88 ft above the ground. the slope distance from the theodolite to the point on the range pole is 148.61 ft. the theodolite’s optical center is 4.66 ft above the upper baseline station at 110 + 71.25. (a) if the elevation of the upper station is 318.71, what is the elevation of the lowerstation?