Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 | Page 9

| | Full-sized twin tunnel |A and B | 1st Ave. shaft. | | | | | | | | | |
Full-sized twin tunnel |A and B |Intermediate shaft. | | | (West of shaft.)
| | | | | | | Full-sized twin tunnel |A and B |Intermediate shaft. | | | (East of
shaft.) | | | | | | | Full-sized twin tunnel |A and B |Intermediate shaft. | | |
(East of shaft.) | | | | | | | Exploration drift |A and B |Intermediate shaft. | |
| (West of shaft.) | | | | Twin tunnel. Enlargement |A and B | West shaft. |
of exploration drift | | (East of shaft.) |
=============================+========+============
=========
===================================================
=================== 4 | 5 | 6 | 7 |
----------------------------------+--------+------------+------------+ | | Length |
Average | DATES. | Time | tunnel | advance |
----------------------------------|elapsed,| excavated, | per day, | | | in | in | in
| From | To | days. |linear feet.|linear feet.|

----------------------------------+--------+------------+------------+ Feb. 28,
1906. |May 12, 1906. | 74 | 346 | 4.7 | | | | | | Feb. 28, 1906. |Apr. 30,
1906. | 62 | 255 | 4.1 | | | | | | Aug. 23, 1906. |Jan. 5, 1907. | 136 | 789 |
5.8 | | | | | | | | | | | | | | | | Apr. 4, 1906. |Oct. 31, 1906. | 210 | 730 | 3.5 | | | | |
| | | | | | | | | | | Apr. 4, 1906. |Oct. 31, 1906. | 210 | 783 | 3.7 | | | | | | | | | | | | |
| | | Nov. 1, 1906. |Dec. 26, 1906. | 56 | 311 | 5.5 | | | | | | | | | | | | | | | | Mar.
1, 1907. |July 23, 1907. | 145 | 947 | 6.5 | | | | | | | | | | | Sept. 6, 1907. |Dec.
4, 1907. | 89 | 603 | 6.8 | | | | | |
===============+==================+========+=======
=====+=============
===================================================
== 8 -----------------------------------------------------
Methods and conditions.
----------------------------------------------------- Top heading and bench.
Muck loaded by hand.
" " " " " " " "
Top full-width heading and bench. Muck loaded by steam shovel.
Working exclusively on this heading.
Top center heading and bench. Muck loaded by steam shovel. Working
alternately in headings east and west of the shaft.
Top center heading and bench. Muck loaded by steam shovel. Working
alternately in headings east and west of the shaft.
Top full-width heading and bench. Muck loaded by steam shovel
working exclusively on this heading.
Exploration drift about 9 ft. by 12 ft. Mucking by hand. Fourteen
timber bents were placed in March, and seven in April, 1907.
Drift excavated to full width and bench. Muck loaded by steam shovel.
===================================================

==
THIRTY-SECOND STREET.
===================================================
========= 1 | 2 | 3 |
-----------------------------+--------+--------------------+ | | | | | | Type of
excavation. |Tunnels.| Worked from: | | | | | | |
-----------------------------+--------+--------------------+ Full-sized single
tunnel | C | 1st Ave. shaft. | | | | Full-sized single tunnel | D | 1st Ave.
shaft. | | | | Full-sized twin tunnel |C and D | 1st Ave. shaft. | | | | | | | | | |
Narrowed twin tunnel | C |Intermediate shaft. | | | (East of shaft.) | | | | | | |
Narrowed twin tunnel | C |Intermediate shaft. | | | (East of shaft.) | | | | | | |
| | | | | | Full-sized twin tunnel |C and D |Intermediate shaft. | | | (West of
shaft.) | | | | Exploration drift |C and D |Intermediate shaft. | | | (West of
shaft.) | | | | Twin tunnel. Enlargement }|C and D |{ Eastward from | of
exploration drift }| |{ open cut. | | | | Twin tunnel. Enlargement }|C and
D |{ Eastward from | of exploration drift }| |{ open cut. | | | |
=============================+========+============
=========

==================================+========+=======
=====+============= 4 | 5 | 6 | 7 |
----------------------------------+--------+------------+------------+ | | Length |
Average | DATES. | Time | tunnel | advance |
----------------------------------|elapsed,| excavated, | per day, | | | in | in | in
| From | To | days. |linear feet.|linear feet.|
----------------------------------+--------+------------+------------+ Jan. 25,
1906.|Apr. 30, 1906. | 95 | 367 | 3.9 | | | | | | Jan. 27, 1906.|Apr. 30, 1906.
| 93 | 354 | 3.8 | | | | | | {May. 22, 1906.|July 24, 1906.[E]}| 173 | 810 |
4.7 | {Aug. 11, 1906.|Nov. 29, 1906. }| | | | | | | | | | | | | | Mar.