HIGHWAY COST KEEPING. 
17 
THE OPERATION CODE. 
-00 Assembling. 
-37 Loosening. 
-01 Backfilling. 
-38 Mixing. 
-02 Blacksmithing. 
-39 Mixing and placing. 
-03 Blasting. 
-40 Moving. 
-04 Building. 
-41 Operating. 
-05 Building false work. 
-42 Oiling. 
-06 Cleaning. 
-43 Painting. 
-07 Clearing. 
-44 Patroling. 
-08 Clearing and grubbing. 
-45 Pile driving. 
-09 Cofferdamming. 
-46 Placing materials. 
-10 Cribbing. 
-47 Placing steel. 
-11 Curing concrete. 
-48 Planting. 
-12 Crushing. 
-49 Plumbing. 
-13 Dragging. 
-50 Plowing. 
-14 Drilling. 
-51 Pumping. 
-15 Drilling and blasting. 
-52 Quarrying. 
-16 Excavating borrow. 
-53 Removing snow. 
-17 Excavating common. 
-54 Repairing. 
-18 Excavating earth. 
-55 Riveting. 
-19 Excavating loose rock. 
-56 Rolling. 
-20 Excavating solid rock. 
-57 Scarifying. 
-21 Excavating wet earth. 
-58 Screening. 
-22 Filling ruts. 
-59 Shaping. 
-23 Filling washouts. 
-60 Spreading bituminous materials. 
-24 Finishing. 
-61 Spreading materials. 
-25 Forming. 
-62 Spreading screenings, sand, or chips 
-26 General. 
-63 Sprinkling. 
-27 Grouting. 
-64 Stripping. 
-28 Grubbing. 
-65 Tamping. 
-29 Guarding. 
-66 Trimming. 
-30 Harrowing. 
-67 Washing. 
-31 Hauling. 
-68 Washing and screening. 
-32 Heating bituminous materials. 
-69 Wasting materials. 
-33 Heating materials. 
-70 Water-proofing. 
-34 Laying. 
-71 Working on joints. 
-35 Loading. 
-72 Wrecking. 
-36 Loading and hauling. 
METHOD OF OBTAINING CLASS AND OPERATION NUMBER FROM CODE. 
To procure a code number for any unit of work it is first decided 
what class of work is under consideration, and a number is selected 
from the class table. Then the specific operation is sought for in 
the second, or operation, table. The two are joined together with 
a hyphen or dash. The code letter of the department then may be 
prefixed to the first number and the classification symbol is complete. 
If it be desired to know the code numbers to be used for re- 
cording the labor of a man mixing concrete for use as a road top 
course the class number for a road top course first is looked up in 
the class code (p. 15). 
41601°— 18— Bull. 660- 
This number is found to be 27; then the 
