the "C" mound and to keep the "A" mound at its present depth. 

 Presently, the disposal point is between mounds "A" and "C" so 

 that future disposal operations will produce a single broad mound 

 at a depth equal to mounds "A" and "C". Figure 2-2 presents the 

 contoured bathymetric chart for the WLIS survey area in August 

 1985. The dominant feature that has appeared since the March 



1984 survey (Figure 2-3) is the disposal mound just east of the 

 buoy location, or mound "C". Mound "B", seen to the west of 

 mound "A", was the result of the disposal of approximately 73,800 

 m-^ of material from Milford Harbor during April-June 1984. 



5. Detailed examination of the depth matrix indicates the 

 minimum depth at mound "C" to be approximately 28.6 meters. This 

 new disposal mound is the result of disposal operations occurring 

 from 10 to 75 meters east of the disposal buoy, according to 

 available scow logs. The minimum depth of mound "A" has remained 

 at approximately 29.2 meters since June 1984. Mound "B" has a 

 minimum depth of approximately 32.4 meters. 



6. Another bathymetric survey was performed on 3 October 



1985 over the same grid (Figure 2-1) used during the August 

 survey to detect significant changes in the topography of the 

 disposal site after passage of Hurricane Gloria. Figure 2-4 

 presents the contoured bathymetric chart for the WLIS survey area 

 in October 1985. Comparison of the August and October surveys 

 reveals the lack of any large scale changes in the bottom 

 topography at WLIS. Examination of the depth matrix for the 

 October survey indicates minimum depths of approximately 28.6, 

 29.2 and 32.4 meters at disposal mounds "C", "A" and "B", 

 respectively. These depth values are identical to the minimum 

 depths obtained prior to the storm in the August 1985 survey. 



7. Volume difference calculations were performed on a 

 reduced grid size that encompassed only the disposal mounds and 

 the immediate surrounding area. These calculations compare the 

 average depth of each 25 m x 12.5 m grid cell for the August and 

 October bathymetric surveys and sum the difference in depths over 

 the entire survey area. The standard error for this accumulative 

 volume change is calculated using the error of an individual 

 depth measurement and a sample size of the number of grid cells 

 that compose the survey area. Comparison of the October survey 

 to the August survey resulted in a volume change of approximately 

 600 m^ with a standard error of ±4410 m^ . Calculation of the 95% 

 confidence limits around this volume change indicates that the 

 actual volume change falls anywhere in the range of -8044 to 

 +9244 m-^. Therefore, one cannot conclude that a significant 

 volume change has occurred. 



3.0 REMOTS ANALYSIS 



8. On 2 3 August 1985, a REMOTS survey was conducted at the 

 WLIS disposal site. The purpose of this survey was to evaluate 

 the dispersion of dredged material at WLIS and to determine the 



