Chicago : Engineering and Contracting Pub. Co. · leaf 656
a glacial deposit of gravel whichchanged to liner material curving a gnat dealof water when the lii si ball of the line hailbeen laid This more difficult excavation ma- December 13, 1911. ENGINEERING & CONTRACTING 641 terially retarded the progress, but presented noexceptional difficulties… … Fig. 3—Arrangement of Emerson Pumpand Well Points in Water-Bearing Sand.Depth of Trench 20 Ft., of Water 6 Ft. depth when the pumps were closed down.The original contractor removed the top 6ft. of material with teams and slip scrapers,then started his sheathing and hand excava-tion. For the first…
Buildings
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