Page 50 - Pipeline Rules of Thumb Handbook

Construction 37

10. Grading irregularities where required. 13. Protecting and preserving existing drainage facilities.
11. Preserving topsoil for replacement, through all culti- 14. Protecting any existing structures or pipelines.
vated or improved fields and pastures, to its original 15. Protecting any telephone or utility lines and keeping
position. them in service.
12. Proper grading of the terrain so as to allow passage of 16. Cutting through fences and hedges where required
loaded trucks and equipment hauling materials and so and replacing these when necessary.
ditching operations can be properly performed. 17. Installing gates and fences where required.

Estimating manhours for removing trees

NET MANHOURS—EACH

Softwood Trees Hardwood Trees Softwood Trees Hardwood Trees
Average Tree Average Tree
Diameter Open Congested Open Congested Diameter Open Congested Open Congested
in Inches Area Area Area Area in Inches Area Area Area Area
Cross-cut Saws Chain Saws
4 1.49 1.86 1.88 2.35 4 0.37 0.46 0.47 0.59
6 2.26 2.83 2.82 3.53 6 0.57 0.71 0.71 0.89
8 3.24 4.02 4.00 4.96 8 0.81 1.00 1.00 1.24
10 4.10 5.08 5.00 6.20 10 1.03 1.28 1.25 1.55
12 4.98 6.18 6.00 7.44 12 1.25 1.55 1.50 1.86
14 6.39 7.86 7.70 9.47 14 1.60 1.97 1.93 2.37
16 7.39 9.09 8.80 10.82 16 1.85 2.28 2.20 2.71
18 8.32 10.23 9.90 12.18 18 2.08 2.56 2.48 3.05
20 10.58 12.91 12.60 15.37 20 2.65 3.23 3.15 3.84
24 12.71 15.51 15.12 18.45 24 3.18 3.88 3.78 4.61
30 17.09 20.85 20.10 24.52 30 4.28 5.22 5.03 6.14
36 20.50 25.01 24.12 29.43 36 5.13 6.26 6.03 7.36

Manhours include ax trimming, cutting down with cross- Manhours do not include hauling, piling and burning of
cut saws or chain saws, and cutting into four-feet lengths for trees or branches, or the removal of stumps.
the tree diameter sizes as listed above. Manhours are average
for various heights of trees.

Estimating manhours for removing tree stumps

NET MANHOURS—EACH NET MANHOURS—EACH
Oper. Powder Oper. Powder
Item Laborer Engr. Man Total Item Laborer Engr. Man Total

Grub & Removal by Hand Blast & Pull with Tractor
8≤ to 12≤ diameter 6.00 — — 6.00 8≤ to 12≤ diameter .83 .11 1.50 2.44
14≤ to 18≤ diameter 7.50 — — 7.50 14≤ to 18≤ diameter 1.05 .23 2.33 3.61
20≤ to 24≤ diameter 9.00 — — 9.00 20≤ to 24≤ diameter 1.50 .30 3.38 5.18
26≤ to 36≤ diameter 11.20 — — 11.20 26≤ to 36≤ diameter 2.11 .42 4.76 7.29

Manhours include excavating and removing by hand or
blasting and removing with cables and tractors. Manhours do
not include burning or removal from premises.