PLAN
| Per Round | Per Cubic Yard | Per linear Foot of Tunnel | |||||||
| Total Depth Drilled | No. of Cubic Yards | Pounds of Dynamite | Adv. | Linear Feet Drilled | Pounds of Dynamite | Cu. Yd. | Linear Feet Drilled | Pounds of Dynamite | |
| Heading | 310-320 | 63-71 | 215-257 | 8-9 | 4.5-5.1 | 3.4-5.7 | 7.9 | 35.6-45. | 26.9-45.0 |
| Bench | 190-210 | 89-100 | 107-155 | 8-9 | 1.9-2.2 | 1.2-1.7 | 11.1 | 21.1-24. | 13.3-18.9 |
| Total | 19 | 56.7-69. | 40.2-63.9 | ||||||
| Per cubic yard, whole tunnel section | 3.-3.6 | 2.1-3.4 | |||||||
| Blasting Notes: All holes of whole round are cleaned and loaded before blasting isstarted | Number of Sticks | |
| First Round: | 5-6 lift holes, 7 to 9 sticks each | 35 to 54 |
First row, sub-bench, 6 holes, 6 to 8 sticks each | 36 to 48 | |
| Second Round: | Second row, sub-bench and widening holes, 8 to 10 holes,6 to 8 sticks each | 48 to 64 |
| Stub holes | 10 to 20 | |
Bench: Total Sticks | 129 to 186 | |
| Total Pounds | 107 to 155 | |
| Third Round: | 8 cut holes, 7 sticks each, often requires 3 to 4charges | 112 to 224 |
| Fourth Round: | 8 holes, First side round, 5 to 7 sticks each | 40 to 56 |
| Fifth Round: | 8 holes, Second side round, 5 to 7 sticks each | 40 to 56 |
2 dry holes 5 to 7 sticks each | 10 to 14 | |
| Sixth Round: | 4 to 6 widening holes and dry holes, 6 sticks each | 36 to 48 |
Stub holes | 20 to 30 | |
Heading: Total Sticks | 258 to 428 | |
| Total Pounds | 215 to 357 | |
The average quantity of powder used on the whole work was about 2.9 lb. per cu. yd. The tables on the diagrams, Figs. 1, 2, 3, and 4, show that the quantity actually used in making the advance at the main working faces was about 2.5 lb. The difference is accounted for by the larger percentage of powder used for trimming the sides, breaking out the cross-passages between the tunnels, and the excavation of the ditches, the latter operation not being done until the concrete lining was about to be put in.
There was some time, too, during the earlier stages of the work, when it is believed that an excessive quantity of powder was used; for one or two months it ran up to 4 lb. per cu. yd.
MUCK CAR USED AT WEEHAWKEN SHAFT