200 ANNUAL REPORT 
The following sets of specifications for concrete sidewalk are given 
here for further comparison with the preceding form. 
The specifications in use in Chicago, IIl., are as follows: 
CITY OF CHICAGO SPECIFICATIONS FOR CONCRETE SIDEWALKS. 
All cutting and filling necessary to bring the foundation to sub-grade, 
as given by the engineer in charge of the work, must be done by the con- 
tractor. When necessary the foundation must be consolidated by wetting, 
rolling or ramming to give it proper Stability. Soft and spongy places 
not affording a firm foundation must be dug out and re-filled with sand or 
gravel, and well compacted by ramming, and foundation brought to within 
four and one-half (44%) inches of the grade. 
On the surface thus prepared shall be placed a layer of hydraulic cement 
concrete for four (4) inches in thickness, composed of one part best Portland 
cement, two parts best clean, coarse, sharp sand. After mixing dry, five parts 
of broken stone, of a size not larger than two and one-half (214) inches in 
dimensions, shall be added and then water added in just sufficient quantity 
as will give a surplus of moisture when rammed. 
The second layer or finishing coat, one-half (14) inch in thickness, to be 
made of one part best imported Portland cement and one part torpedo gravel 
to be used before the first layer has set. 
The undersigned hereby certifies that he has read the foregoing speci- 
fications, and that his proposal for the work is based on the conditions and 
requirements embodied therein, and should the contract be awarded to him 
he agrees to execute the work in strict accordance herewith. 
IN BIC eo ee ERR A ae MR Re cite Residen Cer eee ec ree eae 
