Contracting Company-Pennsylvania Terminal on April 28th, 1906, included
about 502,000 cu. yd. of excavation (about 90% being rock), 17,820 cu. yd.
of concrete walls, 1,320,000 lb. of structural steel, 638,000 ft., B.M., of
framed timber, etc., etc.

This contract was divided into two parts: "Work In and Under Ninth Avenue"
and "Work Between Ninth and Tenth Avenues," and unit prices were quoted for
the various classes of work in each of these divisions. The prices quoted
for excavation included placing the material on scows supplied by the
Railroad Company at the pier at the foot of West 32d Street, on the North
River; there was a clause in the contract, however, by which the contractor
could be required to make complete disposal of all excavated material at an
additional unit price, and this clause was enforced on January 1st, 1909,
when about 94% of the excavation had been done.

For the purpose of disposing of the excavated material in the easterly
portion of the Terminal, the New York Contracting Company-Pennsylvania
Terminal had excavated under Ninth Avenue a cut 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 disposal
pier at the foot of West 32d Street.

On May 11th, 1906, the work of excavation was commenced on the east side of
Ninth Avenue, and on July 9th, 1906, on the south side of 31st Street,
between Ninth and Tenth Avenues. From the beginning, the excavation was
carried on by day and night shifts, except on Sundays and holidays, until
January, 1909, except that during the period from November, 1907, to
October, 1908, the night shift was discontinued.

_Geology._--The rock encountered may be classed as "gneiss"; its character