33 



Table 2-8 

 Methods of Physical and Chemical Analyses for NLDS Seawolf Core Subsamples 



Core Subsample 



Analysis 



Method 



Instrumentation 



All samples 



Grain Size 



ASTM D422 



Sieve/Hydrometer 



All samples 



Moisture Content 



CLP ILMO 4.0 



SW-846 Method* 

 (USEPA 1997) 





All samples 



Total Organic Carbon 



9060 





All samples 



PAHs 



3550A/8270 



GC/MS 



Short core samples 



Trace Metals: 









Arsenic 



3051/6010 



ICP 





Cadmium 



3051/6010 



ICP 





Chromium 



3051/6010 



ICP 





Copper 



3051/6010 



ICP 





Lead 



3051/6010 



ICP 





Mercury 



N A/7471 



CVAA 





Nickel 



3051/6010 



ICP 



All samples 



Zinc 



3051/6010 



ICP 



* First value refers to extraction method, second value refers to analysis method. 

 PAHs = Polycyclic aromatic hydrocarbons 

 NA = Not Applicable 

 GC/MS = Gas Chromatograph/Mass Spectrometer 

 ICP = Inductively Coupled Argon Plasma Emission Spectrometry 

 CVAA = Cold Vapor Atomic Absorption 



2.4.3.1 Polycyclic Aromatic Hydrocarbons (PAHs) 



The initial PAH data received from the MAXIM laboratory pertaining to the 1997 

 core sub-samples were deemed not acceptable for this study because the detection limits were 

 too high. The samples were re-analyzed by a new laboratory (WHG); the methods and results 

 presented here are from the WHG analyses. The potential impact to data quality from 

 changing laboratories was considered to be minimal, and is further discussed in Section 2.4.4. 



Sediment Extraction. According to the Woods Hole Group standard operation 

 procedure, the sediment samples were spiked with surrogate compounds, and extracted by 

 pressurized fluid extraction (Dionex Accelerated Solvent Extractor Model 200) using a 

 methylene chloride: acetone solvent solution. To measure moisture content, samples were 

 weighed, dried in an oven, and re-weighed. 



Monitoring Cruise at the New London Disposal Site, Seawolf Mound 1995 - 1998 



