Transactions of the American Society of Civil Engineers

Table 5

Location.	Number of days worked.	Advance.	Average advnce per day.
Station 323 to Central Shaft headings	492	1,450	4.5
Bench and enlargement of Central Shaft headings	159	{1,150* { 906†	7.2* 5.7†
Central Shaft headings to Weehawken headings	141	620	4.4

The best month’s work in each location was as follows, the actual yardage excavated and paid for being reduced to equivalent linear feet of full section. The tunnels were generally taken out to full section, except for a small amount left in the bottom, which latter reduced the equivalent linear feet of full section to about 95% of the actual advance at the face.

Weehawken.—

			Linear feet.	Feet per day.
Full timbered section,	North Tunnel	Nov., 1905,	87 == 3.0
Sandstone	″ ″	May, 1906,	109 == 3.9
Trap (normal)	South ″	July, 1907,	144 == 5.3

Hackensack (All trap).—

			Linear feet.	Feet per day.
Portal to Central Shaft headings,	South Tunnel	May, 1907,	139 == 5.0
* Enlargement of headings,	″ ″	Nov., 1907,	175 == 6.0
Central Shaft headings to Weehawken headings, North Tunnel		Apr., 1908,	145 == 5.2

* The actual advance of the bench this month was 202 lin. ft.

Central Shaft Headings.—During April, 1907, 122 lin. ft. of heading, averaging 3.8 cu. yd. per lin. ft., were taken out in the South Tunnel, west of the shaft. This was equal to 5.0 ft. per day for the 24 days worked.

The Best Week’s Work.—The best week’s work at either of the main working faces, when the full section was being excavated in trap rock, was 803 cu. yd., equal to 41.8 lin. ft. of full-section tunnel, or an average of 6.0 lin. ft. of full section per day; this was from the South Tunnel at Hackensack for the week ending January 11th, 1908.

The Best Yardage.—The largest number of yards taken out in any one week from one working face was 1,087, equivalent to 56.6 lin. ft. of full section, or an average of 8.1 lin. ft. of full section per day. This was bench and enlargement only (Central Shaft headings) in the North Tunnel, Hackensack, for the week ending October 19th, 1907.

The largest yardage for the whole work in any one week was 3,238 cu. yd. from four working faces—two at Weehawken in full section and two at the Hackensack bench and enlargement (Central Shaft headings). This was equivalent to 168.4 lin. ft. of full-section tunnel, or an average of 6 ft. per day from each working face.

The Best Month’s Work.—The best month’s work with each of the four methods of drilling the headings, as shown in Figs. 1, 2, 3, and 4, where the work was straight forward and the full section was being taken out, was as follows:

Method	No. 1		About	90 ft. in sandstone.
″	No. 2		″	100 ″ in trap.
″	No. 3		″	137 ″ in trap.
″	No. 4		″	145 ″ in trap.

In regard to these figures it should be noted, as stated previously, that the organization of the men and plant was not properly completed until near the time Method No. 4 was put in operation.

In Fig. 9 is shown graphically the relation of the progress to the time elapsed in the North Tunnel, the diagram for the South Tunnel being almost exactly the same.

Notes

* Actual advance.

† Equivalent linear feet of full section tunnel.