. Engineering and Contracting. \ delivered atthe mouth of the tunnel. Pumping.—The quantity of water encount-ered during the excavation of the tunnels,measured somewhat roughly, was appro-xi-mately as follows: At neehawUen 74 gal. per min. At Central Shaft 1 gal. per min. At Hackensack IS gal. per min. The best months work in each location wasas follows, the actual yardage excavated andpaid for being reduced to equivalent linearfeet of full section. The tunnels were gen-erally taken out to full section, except for asmall amount left in the bottom, which latterreduced the equivalent linea
. Engineering and Contracting. \ delivered atthe mouth of the tunnel. Pumping.—The quantity of water encount-ered during the excavation of the tunnels,measured somewhat roughly, was appro-xi-mately as follows: At neehawUen 74 gal. per min. At Central Shaft 1 gal. per min. At Hackensack IS gal. per min. The best months work in each location wasas follows, the actual yardage excavated andpaid for being reduced to equivalent linearfeet of full section. The tunnels were gen-erally taken out to full section, except for asmall amount left in the bottom, which latterreduced the equivalent linear feet of full sec-tion to about 95 per cent of the actual advanceat the face. the South Tunnel at Hackensack for the weekending Jan. 11, 1908. The Best Yardage.—The largest number ofyards taken out in any one week from oneworking face was 1,087, equivalent to of full section per day. This was benchand enlargement only (Central Shaft head-ings) in the North Tunnel, Hackensack, forthe week ending Oct. 19, Station The water at the Weehawken end had to bepumped from the bottom of the shaft, a liftof about 90 ft., while at the Hackensack endit had to be pumped back from the face upgrade to the portal. The cost of pumping was about $100 to $125per month for labor for the whole work, be-sides the cost of the plant (about $1,200) andthe power for runninar it. PROGRESS. The total time elapsed from the time ofstarting work at the Weehawken end, in May,1905, to the completion f the excavation, inMay, 1908, was almost exactly three this time about 40 days were lost in Febru-ary and March, 1906, when work was stoppedby the Receiver of the Shields Company, thetotal number of days actually worked beingabout 940, giving an average progress of per working day in each of the two tun-nels, whicli, omitting the Central Shaft head-ings, gives an average rate of progress foreach working face, of ft. per day. These 940 days include practically all thetim
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