FORMS FOR SPECIFICATIONS, ETC., FOR ROAD MATERIALS. 47 



Sampling Gravel. 



(1) By whom taken. — Samples are to be taken by the engineer or his 

 authorized representative. 



(2) When taken. — Samples are to be taken from the proposed source of sup- 

 ply at least days before the gravel is to be accepted or rejected, also from 



every cubic yards excavated, or when the quality or appearance of the 



gravel changes, and at such other times as may be directed by the engineer. 



(3) Where and how taken. — 



(a) Sampling at the pit: Enough samples shall be taken to represent an 

 average of the material. An individual sample must be taken through a full 

 vertical section of that material which it is proposed to use at the point 

 selected. Each sample shall be taken from a freshly exposed vertical face. 



( 6 ) Sampling from cars, barges, etc. : Enough samples shall be taken, as 

 directed by the engineer, to represent average composition. Samples from cars 

 shall be taken from both ends and from top and bottom of the car. 



(4) Amount and size of sample. — 



(a) Sampling for quality: For screened gravel sample shall weigh 25 to 30 

 pounds. For bank gravel sample shall weigh 50 to 75 pounds. 



(&) Sampling for size: A sample for size shall weigh not less than 10 pounds 

 for materials of three-quarter-inch maximum diameter or less. Samples of ma- 

 terials of other sizes shall increase in weight to a maximum of approximately 

 60 pounds, varying with the size and weight of the largest pieces represented 

 by the sample. The sample shall be representative of the product as delivered 

 for use. 



(5) Marking and shipping. — Samples shall be shipped in tight boxes or bags 

 and shall be accompanied by a card in the container or securely attached 

 thereto, stating date, by whom taken, by whom submitted, source of supply, 

 exact location where sample was taken, proposed purpose to which the material 

 is to be put, space for remarks, and, in case of pit or bank investigation, 

 owner, quantity available, amount and character of stripping, whether material 

 from same source has been previously used, where and for what purpose, 

 and with what results, haul to nearest point on road, average haul to job, 

 character of haul, initial cost of gravel. 



Notification of sampling, containing the above data, shall be forwarded sepa- 

 rately to the laboratory immediately upon taking the sample. 



Sampling Sand. 



(1) By whom taken. — Samples are to be taken by the engineer or his author- 

 ized representative. 



(2) When taken. — Samples are to be taken from the proposed source of 



supply at least days before the sand is to be accepted or rejected, also 



from every cubic yards excavated, or when the quality or appearance 



of the sand changes, and at such other times as may be directed by the 

 engineer. 



(3) Where and how taken. — Samples shall be taken from freshly exposed 

 portions of the deposit as directed by the engineer. Mixed samples may be 

 taken if deemed necessary. 



In general, the number of samples shall be sufficient to cover the extreme 

 variation of quality in that part of the deposit which is proposed to be used. 



(4) Amount and size of sample. — Each sample, whether individual or com- 

 posite, shall weigh between 10 and 15 pounds. 



