Figure 36. Groin 45 in March 1998 



originally designed, but after notching, broken armor and core units were 

 discovered in the structure.' 



A survey of existing structures along Sea Bright to Ocean Township con- 

 ducted in August 1985 reported the description and condition of structures for the 

 New York District's Sea Bright to Ocean Township General Design 

 Memorandum (New York District 1989). Six of these structures are described in 

 Table 4. Information is not available to determine whether the reported stone 

 sizes represent those specified in the original design of the structure. The stone 

 breakage observed in 1997 at Groin 46 was not noted in New York District 

 (1989). Breakage at other groins may be reflected in the "poor" condition 

 classifying Groins 42 and 43. 



The difference in penneability between the existing Groin 44, which is 

 assumed to be nearly zero (see discussion in Chapter 3). and the proposed exten- 

 sion (which will have an estimated composite permeability of 0.20) should have 

 no impact on overall structure function. No major modifications (in particular, 

 sand tightening) to the existing structure should be required prior to construction 

 of the extension. 



Personal Communication. 19 March 1998. Ms. L>nn Bocamazo. Civil Engineer. New York 

 District. 



40 



Chapter 4 Structure Design 



