IS 



quantitation limit; Table 3-3). Two types of BNA compounds were detected in MBDS 

 samples: phthalate esters and PAHs. Almost all of the samples contained bis(2- 

 ethylhexyl)phthalate (including three of four method blanks), and ten out of thirty samples 

 contained di-n-octyl phthalate (Table 3-4). Samples containing bis(2-ethylhexyl)phthalate 

 were qualified due to method blank contamination. 



About one-third of the MBDS stations were below detection limits in all PAH 

 compounds, including the reference area 18-17. FG-23 contained an estimated concentration 

 of pyrene (130 ppb). PAH results were separated into low molecular weight (LMW) and 

 high molecular weight (HMW) compounds (Table 3-3). Total LMW PAH concentrations 

 ranged from 100 to 510 ppb, except for a maximum LMW PAH concentration measured at 

 Station 12-3 (1500 ppb). Phenanthrene was the most commonly detected LMW PAH 

 compound; naphthalene was detected only at Station 12-3. Eight HMW PAH compounds 

 were detected, and total HMW concentrations ranged from 130 to 6520 ppb (Station 12-3) 

 (Table 3-3). 



Chemical Analyses of Sediment Sampling at the Massachusetts Bay Disposal Site, June 1989 



