RECOMMENDED STANDARD METHODS OF SAMPLING. 



Sampling Broken Stone. 



(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 sup- 

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



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



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



(3) Where and how taken. — 



(a) Sampling for quality: Samples shall be taken either from the quarry or 

 from cars as directed by the engineer, and shall be sound interior rock, repre- 

 sentative of that which it is proposed to use. Mixed samples may be taken if 

 deemed necessary by the engineer. 



(6) Sampling for size: Samples of the crusher product shall be taken either 

 at the crusher or from cars as directed by the engineer. The sample shall be 

 mixed from runs of the crusher, on different days, or, if taken from cars, shall 

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



(4) Amount and size of sample. — . 



(a) Sampling for quality: A sample shall weigh between 25 and 40 pounds 

 and shall consist of pieces of rock at least 11 inches in size and one piece at 

 least 3 by 4 by 6 inches, free from seams and cracks, and with bedding plane 

 marked. 



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

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

 materials 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 quarry investigations, 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 rock. 



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

 rately to the laboratory immediately upon taking the sample. 



Sampling Broken Slag. 



(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 sup- 

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



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



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



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