support piles under the cap beam. In addition, angled prestressed con- 

 crete batter piles are installed along the marina side of the structure giv- 

 ing increased lateral support. The baffle panels extend from the bottom 

 of the cap beam to el -0.3 m (-1 ft) mllw. The breakwater is 398 m 

 (1,306 ft) in length and made up of a 176-m-long (576-ft-long) shoreward 

 leg and a 222-m-long (730-ft-long) seaward section. A layout of the ma- 

 rina is shown in Figure 29. 



-N- 



SCALE IN FEET 



Figure 29. Layout of Spud Point Marina, CA 



The Spud Point Marina site was monitored from March 1988 to Febru- 

 ary 1989 under the MCNP program (Lott 1991). The monitoring con- 

 sisted of evaluating the tidal flushing characteristics of the baffled 

 breakwater, measuring transmitted wave heights in the marina for various 

 incident wave and tide levels, and evaluating the structural integrity of the 

 baffled breakwater. At the conclusion of the original monitoring, it was 

 noted that hairline cracks had formed across the width of the top of the 

 breakwater cap in several locations, particularly where there were changes 

 in cap width. The cracks appeared immediately after the cap was cast and 

 were probably shrinkage related. They were considered superficial and 

 did not affect the structural integrity of the breakwater. 



The Spud Point Marina breakwater (Figure 30) was inspected on 16 

 September 1998. The assessment revealed no evidence of misalignment, 

 movement, spalling, or subsidence of the structure. The hairline cracks 

 across the top of the breakwater cap noted in the earlier surveys did not 

 appear to have widened (Figure 31). Additional hairline cracks were ob- 

 served, particularly on the vertical sides of the cap. Some of these cracks 



Chapter 2 Project Descriptions and Inspection Results 



27 



