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Five-task concrete foundation estimate: crew-hour cost build-up, production efficiency delay factor, UFC overtime premium, chained schedule, earned hours and the EP 1110-1-8 crane rate

Tool	Crew Productivity and Labor Estimating
Source	Naval Education and Training Program Management Support Activity (1993). Builder 3 & 2, Volume 1. NAVEDTRA 14043, Pensacola, FL, chapter 9 (man-day estimate, Table 9-2, Figure 9-7, pp. 9-13 to 9-16); U.S. Department of Defense (2010). Unified Facilities Criteria: Handbook, Construction Cost Estimating. UFC 3-740-05, 5-4.1 Example 5-1 and Table 5-1; U.S. Army Corps of Engineers (2016). Construction Equipment Ownership and Operating Expense Schedule, Region I. EP 1110-1-8, Vol. 1, chapter 2 and Figure 2-1; U.S. Department of Energy (1997). Cost Estimating Guide. DOE G 430.1-1, chapters 15 and 21.
Level	Professional

Problem

A foundation is excavated (420 CY at 35 CY per crew-hour), formed (1,800 SF at 45 SF per crew-hour), reinforced (12 tons at 0.6 ton per crew-hour), placed (240 CY at 12 CY per crew-hour on 10-hour days) and stripped and backfilled (420 CY at 50 CY per crew-hour) by an excavation crew (operator 38.00, two laborers 26.00, excavator 95.00 and dump truck 72.00 per hour) and a concrete crew (three carpenters 34.00, ironworker 36.00, two laborers 26.00, finisher 33.00, small tools 6.00), burden 35 %, the tasks in a finish-to-start chain. Find the crew-hour costs, the labor hours, durations, costs and unit costs with the handbook's average production (delay factor 1.00) and with a weather factor of 1.10 on the excavation, the overtime premium of the 50-hour week, the schedule and histogram, the productivity factor and estimate at completion after 420 CY in 40 hours and 900 SF in 160 hours, and the EP 1110-1-8 hourly rate of the pamphlet's example crane.

Inputs to Enter

Tasks: 1 Excavate footings 420 CY, Excavation, 35 CY/crew-hr, 8 h × 5 d; 2 Formwork 1,800 SF, Concrete, 45, after 1; 3 Reinforcing steel 12 ton, Concrete, 0.6, after 2; 4 Place concrete 240 CY, Concrete, 12, 10 h × 5 d, after 3; 5 Strip and backfill 420 CY, Excavation, 50, after 4
Crews: Excavation = operator 1 × 38.00 + laborer 2 × 26.00, excavator 95.00, dump truck 72.00; Concrete = carpenter 3 × 34.00 + ironworker 1 × 36.00 + laborer 2 × 26.00 + finisher 1 × 33.00, small tools 6.00; burden 35 % on every line
Production efficiency rating: eight elements at 67 % (delay factor 1.00); overtime scheme 1.5× weekdays and Saturday, 2× Sunday; advanced mode: weather 1.10 on task 1, installed 420 CY in 40 hr and 900 SF in 160 hr, EP 1110-1-8 Figure 2-1 crane (list 1,508,606, 7.5 % discount, 5.8 % tax, 1,913 cwt at 10.71, life 20,000 h, 1,360 h/yr, salvage 20 %, cost of money 1.7 %, tires 6,840 / 13,680 at wear 0.66 / 0.58 and 2,800 h, engines 200 hp at 0.024 and 445 hp at 0.005 gal/bhp-hr, fuel 2.28, FOG 0.110, LAF 1.16, RCF 0.90)

Open the Crew Productivity and Labor Estimating tool (loaded with this example)

Answers

Crew-hour cost: Excavation 90 × 1.35 + 167 = 288.50; Concrete 223 × 1.35 + 6 = 307.05
Simple mode: crew-hours 12 / 40 / 20 / 20 / 8.4, labor hours 36 / 280 / 140 / 140 / 25.2 (621.2), durations 1.5 / 5 / 2.5 / 2.0 / 1.05 days, chain 12.05 days; task 4 at 50 h/week carries a 10.00 % premium (602.10); costs 3,462.00 / 12,282.00 / 6,141.00 / 6,743.10 / 2,423.40, total 31,051.50 (labor 26,562.60 + premium 602.10 + equipment 3,886.80); peak 7 workers, 70 labor hours a day
Advanced mode: task 1 crew-hours 12 × 1.10 = 13.2, total 31,397.70, chain 12.2 days; earned hours 39.6 + 140 = 179.6 against 200 actual, PF 0.898, task 2 EAC 160 + 140/0.875 = 320 hr, project EAC 661.1 hr with the untracked tasks at budget
Production efficiency 87 % (Figure 9-7) gives delay factor 0.80: 6 MH × 0.8 = 4.8 MH as the handbook prints; UFC Example 5-1: 48 worked, 52 paid, 8.33 %; the closed form reproduces 41 of the 44 printed one-shift cells of Table 5-1 (three misprints)
EP 1110-1-8 Figure 2-1: TEV 1,496,886, depreciation 58.85, FCCM 11.73, ownership 70.58, fuel 16.01, FOG 2.05, repair 77.07, tire wear 10.10, tire repair 1.76, operating 106.99, total 177.57 per hour, 60-hour week 173.66, standby 41.16, every line as printed

Notes

The tool's default inputs are this estimate; press Submit (switch to Advanced for the weather factor, the tracking columns and the crane rate). The foundation quantities, rates and wages are illustrative round numbers, not a published estimate; the printed values reproduced are NAVEDTRA 14043's two man-day examples and its 87 % delay factor, UFC 3-740-05 Example 5-1 and Table 5-1, and EP 1110-1-8 Figure 2-1. Checked by test_crew_productivity.php (595 checks) against the numpy script References/Crew-Productivity/checks/crew_check.py.