Refer to the Benchmark Transfer Drawing. Determine the elevation of BM#2.
BM=Benchmark
SU=Setup
DP=Drawing Turning Point
BS=Back Sight
FS=Fore Sight
Sta BS FS Elevation BM#1 56.81′
SU#1 0.84 3.67
SU#2 1.81 5.69
SU#3 8.61 3.18
#4 7.60 0.93
SU#5 10.41 0.86
BM#2 ?