. Journal of the New England Water Works Association . e-driver operator and6 pile-driver men for each rig. Two rigs were run under one generalforeman and high pressure steam was supplied from a central plant so thata fireman was not usually employed with the driving rig. Pile-drivingprogress for two rigs is shown in Table 1. TABLE 1. — Progress of Driving of Steel Sheet-Piling. Month. Sq. Ft. Month. Sq. Ft. April, 1921 5 600 November 900 May 6 500 December 200 June 9 200 January, 1922 100 July 14,700 February 15 800 August 5 200 March 6 000 September 6 600 April 9 900 October 12 800 May 6 400
. Journal of the New England Water Works Association . e-driver operator and6 pile-driver men for each rig. Two rigs were run under one generalforeman and high pressure steam was supplied from a central plant so thata fireman was not usually employed with the driving rig. Pile-drivingprogress for two rigs is shown in Table 1. TABLE 1. — Progress of Driving of Steel Sheet-Piling. Month. Sq. Ft. Month. Sq. Ft. April, 1921 5 600 November 900 May 6 500 December 200 June 9 200 January, 1922 100 July 14,700 February 15 800 August 5 200 March 6 000 September 6 600 April 9 900 October 12 800 May 6 400 Total 99 900 PRATT. 461 Excavation. As soon as the driving was completed at the north endexcavation was begun with clamshell buckets operated from stiff-leg der-ricks running on a track on top of the west bank. As fast as the trenchwas excavated the sheeting was supported with 12-in. x 12-:n. brace- inbays 10 ft. on centers with the wales and braces spaced 6 ft. apart verticallyfor the upper 32 ft. of the trench. Below this the spacing was reduced. Timbering of Deep-Core Wall Trench. to 3 ft. vertically and subsequently altered to double sets 6 ft. 14 in. x 14 in. and 12 in. x 14 in. braces were used for the lowerportion of the trench. Pumping was required immediately after the in-stallation of the top set of bracing. Two 8 in. discharge, Morris MachineCo., 60 in. diameter, centrifugal dredge pumps were installed and dredgeda considerable yardage of sand and gravel out of the trench, depositing iton the downstream dam embankment, besides pumping water. In addi-tion the following pumping equipment was used: Four No. 9 Pulsometers;two 5 in. Emersons; Two Lawrence 5 in. electric centrifugals and oneWorthington electric 100 6 in. discharge, centrifugal. The quantitiesof water pumped are given in Table 2. TABLE 2.—Monthly Output of Trench Pumps in Millions ok (Iallon*.. March, 1921. April May June July August September. .October. . .November. .6 2 11.
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