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<br />Stone shall be tree from overburden, spoil, shale, and organic <br />material and shall meet the following gradation requirements for the <br />class specified: . <br />Size at Percent ot total weight <br />stone smaller than the given size <br /> Class I <br />100 lb. 100 <br />60 lb. 80 <br />25 lb. 50 e <br />2 lb. not to exceed 10 <br /> , <br /> Class II <br />700 lb. 100 <br />500 lb. 80 <br />200 lb. 50 <br />20 lb. not to exceed 10 <br /> Class III . <br />2,000 lb. 100 <br />1,400 lb. 80 <br />700 lb. 50 <br />40 lb. not to exceed 10 <br /> <br />Each load at riprap shall be reasonably well graded trom the <br />smallest to tbe III8X1mum size specified. Stones smaller tban the speci- <br />fied 10 percent size and spal1s will not be pel'll1tted in an uount <br />exceedill8 10 percent by weight of each load. <br /> <br />Control of gradation will be by visual inspectia1. The contractor <br />shall provide two samples ot rock of at least 5 toaa each, DIeting the <br />gradation tel' the class specified. The sample at the construction site <br />may be a part at the tinished riprap coverill8. The other sample shall be <br />provided at the quarry. These samples shall be used as a frequent reter- <br />ence tor Judging the gradatia1 ot the riprap supplied. Any difference of <br /> <br />~ <br /> <br />11-38 <br /> <br />. <br />