nt viaduct, and the excavation
completed for the west portion.

WORK BETWEEN NINTH AND TENTH AVENUES.

_General Description._--The work involved the excavation of about 5.4
acres, between the west house line of Ninth Avenue and the east house line
of Tenth Avenue, to an average depth of about 50 ft., the construction of a
stone masonry portal at Tenth Avenue leading to the River Tunnels, and the
construction around the site of the concrete retaining and face walls.

The following estimated quantities appear in the contract: Excavation of
rock in trenches, 3,400 cu. yd.; excavation of rock in pit, 377,000 cu.
yd.; excavation of all materials except rock in trenches, 6,500 cu. yd.;
excavation of all materials except rock in pit, 34,000 cu. yd.; concrete,
1:3:6, in retaining walls, 4,580 cu. yd.; concrete, 1:3:6, in face walls,
7,460 cu. yd.; concrete, 1:2:3, with 3/4-in. stone, in face walls, 4,100
cu. yd.; stone masonry in portal, 247 cu. yd., etc., etc.

[Illustration: Fig. 7. (Full page image)

NINTH AVE. ABUTMENTS & KEY PLAN]

As previously stated, the contract price included the placing of all
excavated material on scows at Pier 62, North River. Prior to this contract
this pier had been used by the New York Contracting Company-Pennsylvania
Terminal, for the disposal of excavated material from east of Ninth
Avenue. In order to get the material to the pier, the contractor had
excavated a cut under Ninth Avenue which came to the grade of 32d Street
about midway between Ninth and Tenth Avenues, and a trestle was constructed
from this point over Tenth Avenue and thence to the pier. Fig. 2, Plate
XLVII, shows the east end of this cut, and Fig. 1, Plate L, shows the
trestle, looking east from Tenth Avenue.

A 30-ton steam shovel was brought to the south side of the work, and
commenced operating on July 9th, 1906. After working there about a month,
the earth had been practically stripped off the rock, and the shovel was
moved over to the north side where it excavated both earth and rock until
August 10th, 1907.

At three points south of 32d Street and at one point north of 32d Street
near Tenth Avenue, cuts were made in the rock to sub-grade, and from these
cuts, together with the cuts on the west side of Ninth Avenue, all widening
out was done and the excavation was completed. Fig. 1, Plate L, shows the
excavation of the three cuts on the south side of 32d Street, the steam
shovel operating on the north side of th