ROADS AND BRIDGES, JULY 1, 1913-DEC. 31, 1914. 51 



Oonteact No. 2, Rockville Pike, Md. — Work was begun April 25, 1913, on the 

 road from station 0+15 to 61+20, and completed June 17, 1913, with a loss of 

 three days on account of bad weather. A surface of macadam was laid for 

 6,105 feet, 15 feet wide, making 10,175 square yards. The old macadam road 

 was loosened with spikes in the roller wheels, and a 3-ton scarifier was then 

 used to tear the surface apart. 



About 58.35 tons of No. 1 stone were used to level depressions and reshape the 

 old surface, after which No. 2 stone was spread 3 inches deep to the amount 

 of 1,102.8 tons. This layer was then rolled, and about 1 inch of screenings, or 

 440.7 tons, was spread, watered, and rolled until the surface was completed 

 with a crown of one-half inch to the foot. The crushed rock was hauled from 

 the cars to the road, with an average haul of three-fourths of a mile. 



Drainage structures were as follows : Sixteen feet of 8-inch clay pipe ; 14 feet 

 of 12-inch clay pipe; 76 feet of 10-inch corrugated pipe. Thirty-three feet of 

 pipe were relaid. 



The equipment consisted of two steam rollers, sprinkler wagon, 3-ton scarifier, 

 road machine, gasoline pump, portable tank, and small tools. Labor cost $1.70 

 and teams $4.50 per 8-hour day. The total cost of the road was $5,753.36, 

 which is at the rate of $0,565 per square yard for surfacing, or $0,339 per square 

 yard for the full width. 



The principal items of cost were as follows at contract prices: Completed 

 shoulders, 1,000 linear feet, at $0.15 per linear foot, $150; ditches, 6,000 linear 

 feet, at $0.04 per linear foot, $240; scarifying and shaping subgrade, 10,000 

 square yards, at $0.06 per square yard, $600 ; stone in place, No. 1 stone, 58.35 

 tons, at $2.90 per ton, $169.21; No. 2 stone, 1,102.8 tons, at $2.90 per ton, 

 $3,198.12 ; No. 3 stone, 440.7 tons, at $2.90 per ton, $1,278.03 ; 12-inch clay pipe, 

 14 linear feet, at $0.75 per linear foot, $10.50 ; 8-inch clay pipe, 16 linear feet, 

 at $0.50 per linear foot, $8 ; 10-inch corrugated-iron pipe, 76 linear feet, at $0.85 

 per linear foot, $64.60; drop inlets, at $15 each, $15; lowering drain 33 linear 

 feet, at $0.30 per linear foot, $9.90 ; inlets into culverts, $10. 



Contract No. 3, Rockville Pike, Md. — Work was begun June 30, 1913, on the 

 road from station 210 to station 477+89 and completed October 16, 1913, with 

 a loss of four days on account of bad weather. It is estimated about 2,779.1 

 cubic yards of material were moved in grading the road. The old surface was 

 loosened with spikes in the roller wheels, and a 3-ton scarifier was then used. 



A surface of macadam was laid for 26,814 feet, 15 feet wide, making 44,690 

 square yards. After about 146.95 tons of No. 1 stone were used to level de- 

 pressions, about 6,377.45 tons of No. 2 stone were spread to a depth of Si inches 

 before compacted. This surface was rolled, and 1,651.85 tons of screenings 

 were applied to a depth of T inch before compacted, and the surface sprinkled 

 and rolled to a finished surface having a crown of five-eighths inch to the foot. 

 The stone used was a limestone whose binding and wearing qualities are con- 

 sidered good. The material was dumped in long piles from wagons and spread 

 to proper thickness by means of shovels and rakes. It was shipped in on the 

 cars, and the average haul from the cars to the road was 1£ miles. 



Drainage structures were constructed as follows: Station 211+00, 28 linear 

 feet 15-inch corrugated-iron pipe eulvert; station 246+00, 26 linear feet 10-inch 

 clay pipe and side drain ; station 323+00, 28 linear feet 10-inch corrugated-iron 

 pipe and side drain ; station 328+00, 28 linear feet 10-inch corrugated-iron pipe 

 and side drain. End walls were constructed at all pipe ends to fit local condi- 

 tions. 



