Chicago : Engineering and Contracting Pub. Co. · leaf 425
low the water surface ofthe reservoir. No notable difficulties occurredduring construction. The principal materialexcavated for the foundation was sand andgravel. Two pumps—one 5 ins. and one 6ins.—easily handled all of the water in thefoundation pit. Figure 2 gives a good ideaof the excavation for… … Fig. 2—Excavation for East Park Dam,Showing Rock Buttresses. sion. Figure 2 shows the large natural rockbuttresses disclosed by the excavation, whichmake an ideal bond for the concrete dam. Good sand and gravel for concrete werefound in the immediate vicinity of the damor within a hauling distance…
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