STATE GEOLOGIST. 207 
WATER. 
36. Requirements, —All water must be practically clean and pure. 
STONE. 
37. Quality.k—The stone for concrete shall be of such hardness and 
durability as shall meet the approval of the Commissioner and Engineer. 
38. Platforms for Stone.—The broken stone when delivered along the line 
of work shall be deposited on platforms for that purpose. 
39.  Size.—The broken stone shall range in size from one-fourth (14) 
of an inch, to one and one-half (1%) inches in the greatest dimension. It 
shall be free from mud, dirt, dust, loam or other objectionable material. 
39. Screening.—- The broken stone shall be screened, when necessary, on 
a one-fourth (44) inch screen, to eliminate all dust and smali particles, and shall 
be thoroughly drenched with water immediately before being used in the 
concrete. 
GRAVEL. 
40, Size. —The gravel shall consist of particles ranging in size from one- 
fourth (44) of an inch to one (1) inch in the greatest dimension. 
4{. Washed and Screened.—It shall be clean washed gravel free from 
loam, vegetable matter, clay, silty sand or other foreign matter and shall 
be screened on a one-fourth (%) inch screen. 
42. Platforms for Gravel,.—When delivered along the line of the work, 
the gravel shall be deposited on platforms made for that purpose. 
CINDERS. 
43. Requirements. The cinders shall be clean, sharp, soft-coal cinders 
free from ashes and clinkers. 
