Table 5. Sand availability for borrow areas.' 



Area 



Sand thickness 



Sand volume 



Minimum^ 



Potential^ 



Minimum 



Potential 





(yards) 



(yards) 



(X 10^ cubic yards) 



(X 10^ cubic yards) 



A 



3 



3.0 



24.30 



24.30 



B 



3 



5.0 



19.41 



32.35 



C 



2 



3.0 



14.32 



21.48 



D 



3 



5.0 



65.64 



109.40 



E 



2 



2.5 



38.64 



48.21 



F 



3 



5.0 



672.00 



1,120.00 



G 



4 



4.3 



241.04 



259.11 



H 



3 



4.3 



480.00 



688.00 



I 



4 



5.0 



518.68 



648.35 



J 



3 



6.0 



756.00 



1,512.00 



K 



2 



3.0 



950.06 



1,425.09 



L 



3 



3.0 



698.01 



698.01 



M 



6 



6.0 



960.30 



960.30 



N 



2 



3.5 



399.04 



698.32 



Total 



5,837.42 



8,244.98 



1. See Figures 27, 28, and 29. 



2. Values based on core data. 



3. Values derived from extrapolation of core data by seismic reflection records. 



d. Area D, Area D is an elongate region between Gardiners Island 

 and the southern Long Island peninsula (Fig. 27). Cores 9, 11, and 12 

 contain suitable sand for their entire lengths, which means a minimum 

 sand thickness of 3 yards. The sand appears on the seismic records to 

 be flat bedded and continuous with depth; therefore, 5 yards (4.6 meters) 

 is judged to be a reasonable potential thickness. The eastern boundary 

 shows a sharp contact where fine-grained (type V) sediments overlie the 

 older sand deposits. The western boundary is tentative because data are 

 lacking; it possibly continues farther west to the line of islands string- 

 ing south from Gardiners Island. 



e. Area E. This area projects southeast from the eastern shore of 

 Gardiners Island (Fig. 27). The sea floor slopes gently east from the 

 shore at Gardiners Island to the 60-foot (18.3 meters) depth contour. 

 Core 13 contains clean, inedium to coarse sand for the entire length of 

 6.6 feet (2 meters) while core 14, to the southeast, contains 7.5 feet 



72 



