However, three stations at CS-1 had unusually low (less than +6) 

 values (400W, 200NE, and 600S) ; station 400S at CS-2 was also 

 anomalously low. 



Post Storm Survey 



On 28 October, one month after Hurricane Gloria, 

 REMOTS surveys were again performed at CS-1 and CS-2. Ten 

 stations were occupied at each mound (Figure 3-48) . 



Hurricane-produced erosional features such as mud clasts 

 and surface shell lag layers were evident in a number of stations 

 at CS-1 (Figures 3-48 and 3-49) . In addition, several stations 

 (25E, 200E, and 200W) exhibited fine sand sediments (4-3 phi) 

 overlying silt-clay (Figure 3-50) . Sand layers had not been 

 observed previously at CS-1; this coarse-grained material may have 

 represented lag deposits produced by bottom scour (compare with 

 Figure 3-39A) . 



A similar pattern of bottom disturbance was evident at 

 CS-2 (Figure 3-51) . Shell lag, mud clasts, and sandy surface 

 layers were evident throughout the mound. At a number of stations 



(25S, 200S, 200E) , the apparent percentage of coarse-grained 

 sediments evident in surface sediments had increased since August 



(Figure 3-52) . As at CS-1, this suggested that fine-grained 

 sediments had been winnowed by bottom currents. Unlike STNH-N and 

 STNH-S, evidence of bottom disturbance at the two capped mounds 

 did not appear concentrated at the center of the disposal mounds. 



At CS-1, post-storm boundary roughness values were 

 significantly greater than the August values (Mann-Whitney U-test, 

 p = 0.007) . Conversely, boundary roughness values at CS-2 had not 

 changed significantly (Mann-Whitney U-test, p = 0.408). This 

 discrepancy suggested that the sand cap may have been more 

 effective than the silt cap in stabilizing the bottom. 



RPD values decreased significantly since the August 

 survey at both CS-1 and CS-2 mounds (Figures 3-53 and 3-54, 

 Mann-Whitney U-tests; p = 0.048 and 0.003 respectively). This 

 decrease apparently reflected the disturbance produced by 

 Hurricane Gloria. In general, RPD depths decreased less at these 

 capped mounds due to the storm than at STNH-N and STNH-S. 



Comparison of the distributions of the apparent infaunal 

 successional stages at CS-1 and CS-2 (Figures 3-55 and 3-56) with 

 the August data (Figures 3-44 and 3-45) indicates that CS-2 

 experienced no obvious change in successional status, while CS-1 

 showed evidence of retrograde succession. In the post-storm 

 survey, only two stations at CS-1 (CTR and 600W) revealed evidence 

 of Stage III infauna. This apparent difference in the impact of 



15 



