Table 6. Fill requirements for the Maryland coast (U.S. Army 

 Engineer District, Baltimore, 1972). 



Location Initial fill (*10 6 yd 3 ) Nourishment (xlO 6 yd 3 ) 



Annual 50-yr period 



0.0913 4.5650 



1.4885 74.4250 



Fenwich Island 



3.1262 



Ocean City 



1.3115 



Assateague 



5.4843 



North Beach 



0.9729 



Fox Level 



0.6542 



Pope Bay 



0.8544 



Tom's Cove 



0.1558 



Totals 12.5593 1.5798 78.9900 



Total sand requirement for complete project: 91,550,000 yd 3 , 



Textural characteristics of beach sand at Ocean City and Assateague 

 as reported by the U.S. Army Engineer District, Baltimore (1972), are 

 shown in Table 7. Of 36 samples collected between the dune and the low 

 water line along Ocean City, most are within the fine- and medium-size 

 classification of sand. The actual range of median sizes is 2.56 to 0.79 

 phi (0.17 to 0.58 millimeter); the average median size is 1.69 phi (0.31 

 millimeter) , which is about the middle of the medium-size classification 

 (1 to 2 phi). Seventy-six samples were collected from the beaches of 

 Assateague Island. These sands tend to be slightly coarser than those 

 from Ocean City, having an average median diameter of 1.56 phi (0.34 

 millimeter) . Beach sands from this region are durable quartz and feld- 

 spar grains with minor amounts of accessory heavy minerals. Calcium 

 carbonate content and content of easily abraded or crumbled grains, such 

 as clasts of peat or clay, glauconite grains, foram tests, etc., are 

 limited to a few percent. 



3. Resource Assessment of Inner Shelf Sand Deposits . 



a. Textural Characteristics of Offshore Sands . Although most of 

 the entire inner shelf off northern Delmarva is mantled by fine to coarse 

 sands, the linear shoals provide the best potential source of beach sand 

 in terms of size, sorting, thickness, and ease in locating. The impact 

 of local relief on the three-dimensional shape of the surface sand body 

 is illustrated by the thickness map of medium- to coarse-size, clean sands 

 (Fig. 38). This figure, constructed using the results of a visual inspec- 

 tion of core samples collected at 1-foot intervals, groups the sediment 

 thicknesses in four classes. Cores collected from the crests of large 

 shoals generally show sand thicknesses greater than 3.7 meters or at least 

 between 1.8 and 3.7 meters. Sand thicknesses between 0.9 and 1.8 meters 

 are restricted to flanks of shoals, or in some cases, between shoals. 



92 



