A summary of some of the items that go to make up the cost of a concrete sewer and the relative amount of these items on different jobs is given in Tables 69 and 70. TABLE 69 DIVISION OF LABOR COSTS FOR THE CONSTRUCTION OF 96–INCH CIRCULAR CONCRETE SEWER ─────────────────────────────────────────╥───────────────────────────── Classification of Labor ║ Classification of Work ─────────────────┬───────────┬───────────╫─────────────────┬─────────── Task or Title │ │ Total ║ Type of Work │ │ Number of │dollars per║ │Dollars per │ men │ day ║ │ foot ─────────────────┼───────────┼───────────╫─────────────────┼─────────── Superintendent │ 1│ 6.00║Excavation │ 1.80 Engineman │ │ ║Sheeting and │ │ 1│ 3.50║ bracing │ 0.58 Hoister │ │ ║Bottom plank │ (engineman) │ 1│ 2.00║ │ 0.17 Tag-men │ 2│ 3.30║Pulling sheeting │ 0.45 Earth diggers │ 10│ 16.50║Backfilling │ 0.33 On dump cars │ │ ║Making and │ │ 2│ 3.30║ placing invert │ 1.17 Carpenter on │ │ ║Making and │ bracing │ 2│ 3.00║ placing arch │ 1.54 Carpenters’ │ │ ║Laying brick in │ helpers │ 2│ 3.30║ invert │ 0.29 Laying bottom │ 2│ 3.30║ │ Moving pumps, │ │ ║Bending and │ etc. │ │ ║ placing steel │ │ 2│ 3.30║ in arch │ 0.20 Pulling sheeting │ 3│ 5.25║ │ Mixing and │ │ ║Bending and │ placing │ │ ║ placing steel │ concrete │ 16│ 26.40║ in invert │ 0.09 On steel forms │ │ ║Moving forms and │ │ 3│ 5.25║ centers │ 0.62 Water boy │ │ ║Watchmen, water │ │ 1│ 1.00║ boy, etc. │ 0.62 Coal and oil │ │ 5.00║ │ │ │ —————║ │ ————— Total │ │ 90.40║ Total │ 7.86 ─────────────────┴───────────┴───────────╨─────────────────┴─────────── NOTES.—Trench was 12½ feet wide and of various depths. At depth of 12 feet the cost of excavation was $1.61 per foot. From Engineering and Contracting, Vol. 47, p. 157.