40_ 



3.6 Sediment Grab Sample Collection 



A series of nine sediment grab samples were collected from the initial pseudo-UDM 

 deposit during the November 1996 precap survey over the Royal River Project Area 

 (Figure 3-6). A 0. 1 m^ Young-modified Van Veen grab sampling device was deployed at 

 the central disposal point as well as eight stations within a 50 m radius of the PDA 96 buoy 

 (Table 3-2). 



Each grab sample from the precap survey provided sufficient quantity of material 

 for analyses. For grain size analyses, a portion of the sediments were placed into one- 

 gallon Dow® Ziploc® storage bags, labeled, and forwarded to an independent laboratory. 

 The remaining sediments of each grab sample were subdivided into two pre-cleaned 1 liter 

 bottles, and preserved in a 70% methanol/seawater or a buffered Rose Bengal/formalin- 

 /seawater solution. A discussion of the solutions used for preserving the samples is in 

 Section 3.8. The 18 samples were sent to the Micropaleontology Laboratory at Wesleyan 

 University for meiofauna and mineralogical analyses. 



Table 3-2 





Grab Sampling Grid 





Station 



Latitude 



Longitude 





NAD 27 





CTR 



43° 33.790' N 



70° 01.512' 



W 



SON 



43° 33.817' N 



70° 01.512' 



W 



50NE 



43° 33.830' N 



70° 01.488' 



W 



50ENE 



43° 33.800' N 



70° 01.482' 



W 



50SE 



43° 33.771' N 



70° 01.488' 



W 



SOS 



43° 33.763' N 



70° 01.512' 



W 



SOSW 



43° 33.771' N 



70° 01.542' 



W 



SOW 



43° 33.790' N 



70° 01.554' 



W 



SONW 



43° 33.830' N 



70° 01.542' 



W 



Tlie Portland Disposal Site Capping Demonstration Project, 1995-1997 



