32 



chemical analysis. Therefore, the results for these stations were normalized to the percent 

 silt/clay in the fraction of the sample that was analyzed (F7 = 15%, EREF=20%, 

 SREF=21%). Results from normalization of samples with <20% fine-grained material 

 should be treated with caution as artificially inflated values can result (NOAA 1991). 



The normalized results for metals analysis for both cap sediments and the reference 

 stations are listed in Table 3-4. There are fewer normalized values that are above the 

 maximum normalized reference values, especially for Hg. Again, the significantly elevated 

 values are concentrated in Stations F7 (As, Cr, Cu, Pb, Ni, and Zn) and H5 (Cu, Pb, and 

 Zn). The number of elevated normalized values at F7 is partially a function of 

 normalization, where the data are normalized to a very small fraction of fine grained 

 sediment. Both F7 and H5 are located along the southern edge of the sampled cap stations 

 (Figures 3-11, 3-12, and 3-13). 



PAHs were analyzed at the reference areas as part of the baseline chemistry survey. 

 The total Low Molecular Weight (LMW) and High Molecular Weight (HMW) PAHs, not 

 including values below detection, are listed for each reference area. SEREF had the lowest 

 values for total LMW and HMW PAHs, and SREF had the highest values. The results for 

 all replicates at each reference area are listed in Table 3-5. 



Monitoring Cruise at the Portland Disposal Site, July 1992 



