REMOTS® monitoring at the New Haven 83 (NH-83) disposal mound 

 began with a baseline survey in October 1984. The 1986 survey was 

 conducted at the same stations sampled in August 1985. 



The 1986 REMOTS® survey of the CLIS-86 disposal point was the 

 first to be conducted at this site. This point was established 

 east of the Cap Sites One and Two in October 1985; disposal has 

 taken place since that time. The present survey was done on a 

 cross-shaped grid at 17 stations, located at 200 meter intervals 

 from station Center out to 600 meters. Quadrant stations were also 

 located at 200 meter positions. 



The REMOTS® surveys at the Ghost Site 1 and Ghost Site 

 2 areas each consisted of a 7 x 7 orthogonal grid with stations 

 located 100 meters apart. Only One photograph was taken at each 

 station. 



REMOTS® photographs were taken with a Benthos Model 3731 

 Sediment-Profile Camera (Benthos, Inc. North Falmouth, MA) . The 

 REMOTS® camera is designed to obtain in-situ profile photographs 

 of the top 15-20 cm of sediment. A detailed description of the 

 REMOTS® camera operation and photograph analysis is presented in 

 Damos Contribution #60 (SAIC, 1989b). 



2 . 4 Sediment Chemical Analysis 



Sediment samples were collected from the centers of the 

 ten disposal mounds in the CLIS disposal area and at the reference 

 station. In addition, eight stations around the STNH-N mound were 

 sampled. For all of these stations, triplicate samples were 

 collected using a 0.1 m 2 Smith-Mclntyre grab sampler. Four 

 polycarbonate plastic core liners (6.5 cm ID) were pushed into each 

 sediment grab sample and extracted. These core samples were then 

 separated into the Top (0-2 cm) section and the Bottom or remainder 

 (about 2-10 cm depth) section and bagged separately for subsequent 

 chemical analysis by the NED laboratory. The cores were separated 

 to determine whether the surface sediment was relatively more or 

 less contaminated than the deeper sediment. The samples were kept 

 cold and returned to the NED laboratory where they were stored at 

 4°C until analyzed. The parameters measured included a suite of 

 trace metals, and several organic constituents. 



Sediment analyses were conducted using methods described 

 by the U.S. Environmental Protection Agency (Plumb, 1981) . Mercury 

 (Hg) analysis was performed using acid digestion and cold vapor 

 atomic absorption spectrophotometry; arsenic (As) analysis was 

 accomplished using acid digestion and gaseous anhydride atomic 

 absorption spectrophotometry. The other inorganic compounds (lead 

 (Pb) , zinc (Zn) , chromium (Cr) , copper (Cu) , cadmium (Cd) , nickel 

 (Ni) , and iron (Fe) ) were analyzed using acid digestion and flame 

 atomic absorption spectrophotometry. 



