RECOMMENDED STANDARD METHODS OF SAMPLING. 



52. SAMPLING BROKEN STONE. 



(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 supply 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, representative 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 1£ inches in size 

 and one piece at least 3 by 4 by 6 inches, free from seams and cracks, and with bed- 

 ding plane marked. 



(b) 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 separately 

 to the laboratory immediately upon taking the sample . 



53. SAMPLING BROKEN SLAG. 



(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 supply 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. 



(3) Where and how taken. — (a) Sampling for quality: Samples shall be taken either 

 from the deposit or from cars as directed by the engineer, and shall be representative 

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

 by the engineer. 



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