Table 2-1 



Summary of Laboratory Analytical Work, Summer 1991 



TYPE OF TEST 



TEST METHOD 



INSTRUMENTATION 



Metals 



EPA Test Method No. 







Sample Prep 



Analytical 





Cadmium (Cd) 



3050 



7131 



GFAA 



Lead (Pb) 



3050 



7421 



GFAA 



Zinc (Zn) 



3050 



6010 



ICP 



Polynuclear 

 Aromatic 

 Hydrocarbons 

 (PAHs) 



3540 



8270 



GCMS 



Total Organic 

 Carbon 





9060 





Grain Size 



ASTM 

 D422-63 







method blanks, matrix spikes, duplicate samples, and laboratory control samples. Method 

 blanks are laboratory QC samples processed with the samples but containing only reagents. 

 Method blanks test for contamination which may have been contributed by the laboratory 

 during sample preparation. No contaminants were measured in these method blanks. 

 Analysis of matrix spike samples provided a measure of the efficiency and effectiveness of 

 sample preparation and analysis procedures. The matrix spike samples also indicate how 

 tightly a compound is bound to its matrix and the presence of interfering compounds. 



Matrix spikes were also used to assess the accuracy of analytical measurements. 

 Duplicate samples indicate variability in laboratory procedures and degrees of difference 

 between individual samples. Duplicate blank spike and duplicate matrix spike samples were 

 used to measure precision in laboratory procedures. 



Monitoring Cruise at the New London Disposal Site, June 1991 



