The average daily traffic over the Ninth Avenue Elevated Railway was 90,000 passengers, and, during the progress of the excavation and underpinning, about 100,000,000 passengers were carried over that structure.
The total excavation was 521,000 cu. yd., of which 87% was solid rock.
The average drill performance was about 33 lin. ft. per 8-hour shift.
The average number of cubic yards of excavation per drill shift was 13.9.
The average number of feet of drilling per cubic yard of excavation was about 2.4.
The average excavation per pound of dynamite was 2.2 cu. yd.
The average amount of excavation per derrick shift of ten hours, 87% of the excavation being rock, was 50 cu. yd.
The average derrick force per shift, including only foreman and laborers, was 13 men.
The salaries of the engineering staff in the field and the expenses of equipping and maintaining the field office amounted to 2.8% of the cost of the work executed, 2.7% being for engineering salaries alone.