60 BULLETIN 583, U. S. DEPARTMENT OF AGRICULTURE. 
Table 35. — Summary of cost of construction. 
POWERS FERRY ROAD. 
Earth excavation : Cost. Per cent. 
Supervision $442. 65 7. 1 
Teams 2, 462. 85 39. 5 
Materials 314. 19 5.0 
Equipment 334. 95 5. 5 
General expense 356. 91 5. 7 
Convict labor 2, 325. 26 37. 2 
Total 6, 236. 81 100. 
Quantity of excavation, 30,255 cubic yards. 
Cost per cubic yard, 20.6 cents. 
Rock excavation : 
Supervision 193. 57 10. 
Teams 296. 60 15. 5 
Materials 376. 79 19. 5 
Equipment 172. 00 8. 9 
General expense 88. 00 4. 6 
Convict labor 800. 70 41. 5 
Total 1, 927. 66 100. 
Quantity of excavation, 3,548.6 cubic yards. 
Cost per cubic yard, 54.3 cents. 
Clearing and grubbing : 
Supervision 86. 87 14. 5 
Teams 27.07 4.3 
Materials . 98. 62 16. 
Equipment 8. 90 1. 4 
General expense 32. 30 5. 2 
Convict labor 360. 41 58. 6 
1.6 
86.5 
.9 
11.0 
Total 614.17 100.0 
Area cleared and grubbed, 9 acres. 
Cost per acre, $68.24. 
15-inch vitrified-clay pipe : 
Supervision 2. 04 
Materials. 109. 68 
Equipment .07 
General expense 1. 10 
Convict labor 14. 05 
Total 126. 94 100. 
Amount of pipe laid, 288 linear feet. 
Cost per linear foot, 44 cents. 
Concrete masonry: 
Supervision 30. 11 10. 1 
Teams 7.64 2.5 
Materials 186. 70 62. 4 
Equipment 1. 09 .4 
General expense 7. 10 2. 4 
Convict labor. 66. 38 22. 2 
Total 299.02 100.0 
Amount of masonry, 62 cubic yards. 
Cost per cubic yard, $4.83. 
