Page:Final Report - The Columbia River Interstate Bridge.pdf/48

 The methods of constructing the bulkheads and of the discharge arrangement are clearly shown by the accompanying photographs. After sections of the ﬁnished embankments became thoroughly drained as the work proceeded. the posts of the bulkheads were cut away and the planks removed and carried forward for repeated use. Parts of the posts and of the 2 by 6 ins. ties therefore remain in the embankment. The ﬁnishing of the slopes was done by hand with shovels, and the successive steps were so located that the upper corner of each step ﬁlled into the lower corner of the step below, to provide the proper slope. The actual pumping and transportation of the sand in

the hands of these Contractors were the simplest parts of the work, and they found it economical to permit a very considerable wastage of material where such wastage saved in the construction of bulkheads.

This work was carried out under the personal direction of Mr. Edward Simpson of Tacoma. Vice-President of the Tacoma Dredging Company. The secondary approach to Derby Street