Sediment quality at Massachusetts Bay Disposal Site stations and Reference Areas compared to regional sediment quality.  
                                 
      Metals (ug/g dry wt) Organics (ng/g dry wt.)  
LOCATION DATA SOURCE DATE ARSENIC CADMIUM CHROMIUM COPPER LEAD MERCURY NICKEL ZINC Total PCBs1 Total DDTs3 Total PAHs LMW PAHs4 HMW PAHs7  
                                 
Reference Stations                                
Mean Ref. Stations SAIC, 1994 1985 - 1987     56 20.8 56.3   27.8 98.8            
Mean Ref. Stations SAIC, 1994 June, 1989     73.5 29 50   23.5 116 nd2 7.45 65 nd 65  
Mean Ref. Stations SAIC, 1995 1989 - 1993 15.7 1.08 79.8 19.7 46.7 0.121 25.1 90     2352 268 2060  
1994 Ref. Station M&E, 1995 (EPA) Sept, 1994 10.8 0.03 59 16.4 30.6 0.12 20.7 74.5 15.3 5.1 1130 178 952  
                                 
Disposal Site Stations                                
Mean MBDS SAIC, 1994 June, 1989     70 44 72   21 127     1308 164 5 1144  
Station 12-3 SAIC, 1994 June, 1989     139 74 110 0.47 16 221 nd2   8002 1500 5 6520  
Station 12-3 SAIC, 1996 Sept, 1993 12 1.7 95 44 71 0.101 26 129     21600 6500 6 15100  
MBDS South Gardner and Pruell, 19918 May, 1991   0.54 35.7 15.7 3.08   25.9 72.7 2.3 4.1 178.3 27.3 151  
IWS North Gardner and Pruell, 19918 May, 1991   0.36 40.8 18.4 3.19   26.2 78.4 1.2 1.1 32.4 6.6 25.8  
Station 12-3 M&E, 1995 (EPA) Sept, 1994 12.1 0.03 80.7 42.1 64 0.3 22.5 102.7 318.1 112.3 15950 2816 13134  
IWS M&E, 1995 (EPA) Sept, 1994 14.4 0.03 92.5 34.7 59.7 0.24 31.4 110 117.9 16.7 14614 2114 12500  
                                 
Regional or local levels                                
NS&T National Mean SAIC, 1994 1985 - 1989     110 35 43 0.17 34 140            
NS&T National "High" SAIC, 1994 1985 - 1989     230 84 89 0.49 69 270            
Mean Boston Harbor Long et al., 1996 (NOAA) July, 1993         144.4       268   14804      
Effects range - Low Long et al., 1995 (NOAA) 1980s-1990s 8.2 1.2 81 34 46.7 0.15 20.9 150 22.7 1.58 4022 552 1700  
Effects range - Medium Long et al., 1995 (NOAA) 1980s-1990s 70 9.6 370 270 218 0.71 51.6 410 180 46.1 44792 3160 9600  
                                 
1 Sum of 18 or 19 congeners                                

 

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