1. Material Characteristics. 



a. Native Sand. 



(J)g, = 2.51 (|) (0.1756 mm) (see laole C-5). 



4,^ = 1.37 d> (0.3869 mm) 

 lb 



Mean diameter (see eq. 5-2) 



= 1.94 4) (0.2606 mm) 



0.570 ()) (0.6736 mm) 



(})_, = 2.61 <t) (0.1638 mm) 



OH 



6,, = 1.00 (() (0.500 mm) 

 lb 



Mean diameter (see eq. 5-2) 



^ = ^-^^ t ^'^" = 1-81 * (0.285 mm) 



(pA Z 



o.A = ^'^^ " ^'"^ = 0.805 <^ (0.572 mm) 

 (pA Z 



c. Borrow — Source B. 



(fig^ = 3.47 (j> (0.0902 mm) 

 (j) , = 0.90 <t> (0.5359 mm) 



Mean diameter (see eq. 5-1): 



^ = 3.47 + 0.90 ^ 2.19 ^ (0.219 mm) 



<pD 2. 



^ = -^'^^ ^ ^'^^ = 1.29 <). (0.4090 mm) 

 90 z 



2. Evaluation of Borrow Materials (see Fig. 5-3) . 



V V . 1.81 -1.94 _ ^^228 

 o^ 0.57 



(|)n 



%A 0.805 , .,„ 



— "— = r, cT = 1.412 



a, 0.57 

 (})n 



8-91 



