Newark Bay Study - Passaic River Public Digital Library

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1-28 Longitudinal, vertical and lateral profiles for TCDD and OCDD in Newark Bay sediments are presented in Figures 1-10, 1-11 and 1-12. The concentrations of TCDD in surface sediments are about 0.4 ng/g near the mouth of the Passaic River, then decrease within the Bay to an average concentration of 0.01 ng/g (Figure 1-10). In the Kill van Kull, TCDD levels drop by one order of magnitude relative to Newark Bay. Peak levels in the surface sediments occur within one mile of Newark Bay. Unlike the Passaic River where the peak concentrations occur at depth, vertical profiles generally show a consistent trend of decreasing TCDD levels in deeper sediments (Figure 1- 11). It is noteworthy that most cores were analyzed for TCDD to a depth of 6 ft below the surface; the analysis for layers between 6 ft and 14 ft was only performed on a limited number of cores. The data also show some spatial variation in TCDD concentration in the lateral direction. For example, a comparison of TCDD levels in surface sediment collected east and west of the midchannel (refer to Figure 1-12) reveals some differences in concentrations (open vs. closed circles); those differences are however less pronounced than what is observed for total PCBs (tPCBs). The data also show significant differences within a cluster of samples collected from the same reach and river mile (open circles). In addition, there is no clear pattern to the lateral distribution of TCDD levels – concentrations appear to vary independently of proximity to the shoreline. One interesting aspect of the TCDD distribution in Newark Bay is the decrease in the ratio of 2,3,7,8-TCDD to total TCDD in surface sediments south of the lower Passaic River (Figure 1- 13). The ratio varies from about 0.64 in Newark Bay, to about 0.36 in Kill van Kull, with average values of about 0.58 and 0.48, respectively. Although slightly lower, the ratio in northern Newark Bay is comparable to 0.71 as calculated by Chaky (2003). The dominance of the 2,3,7,8-TCDD in the lower Passaic River and Newark Bay suggests that the ratio may be used as a tracer to fingerprint dioxin contamination in the study area. The use of the ratio should however be subject to further scrutiny by, for example, testing it on other dioxin congeners, before it becomes a reliable fingerprinting tool. OCDD is also widely distributed throughout Newark Bay (Figure 1-14). The highest levels in the surface sediment are also found near the mouth of the Passaic River, where peak concentrations reach 7.3 ng/g (compared to 22.6 ng/g in the lower Passaic River proper). Figure 1- 14 also shows a decrease in OCDD concentrations from the mouth of the lower Passaic River through the first couple of miles to the south in Newark Bay. It is, however, interesting to note that OCDD levels in surface sediments increase again between RM2.5 and RM5.5 in the Bay suggesting the presence of other potential sources of OCDD in Newark Bay proper. Unlike TCDD, the concentration in deep sediments has a tendency to increase in particular between RM2.5 and RM5.5. For example, between 2 and 4 ft below the surface sediment, OCDD levels remain comparable to those found in the surface sediments and in some cases even exceed them. In addition, levels of OCDD reach a maximum concentration of 6.2 ng/g in sediment buried between 2 and 4 ft, compared to only 2 ng/g in the surface sediment at the same location. Depth profiles at selected
TCDD (ng/g) TCDD (ng/g) TCDD (ng/g) TCDD (ng/g) TCDD (ng/g) 10 1 0.1 0.01 0.001 0.0001 10 1 0.1 0.01 0.001 Surface Sediment 0 1 2 3 4 5 River Mile (mi) 6 7 8 9 10 0.0001 0 1 2 3 4 5 6 7 8 9 10 10 1 0.1 0.01 0.001 River Mile (mi) 0.5 - 2 ft 0.0001 0 1 2 3 4 5 6 7 8 9 10 10 1 0.1 0.01 0.001 0.0001 10 1 0.1 0.01 0.001 0.0001 River Mile (mi) 2 - 4 ft 4 - 8 ft 0 1 2 3 4 5 6 7 8 9 River Mile (mi) 0 1 2 3 4 5 6 7 8 9 River Mile (mi) Figure 1-10. Longitudinal and vertical profile of 2,3,7,8 TCDD in the Newark Bay/Kill van Kull Domain. The first mile overlaps with the Lower Passaic River Restoration Project Study Area. 12 ft 10 10 1-29
Page 3 and 4: Newark Bay Study Final Modeling Wor
Page 5 and 6: FIGURES Figure Page Figure 1-1. New
Page 7 and 8: SECTION 1 1 INTRODUCTION 1.1 OVERVI
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Page 19 and 20: 1.4.2.1 A Macro-Scale Solids Balanc
Page 21 and 22: the peaks in flow, thereby limiting
Page 23 and 24: Figure 1-4. Bathymetry and Sediment
Page 25 and 26: Figure 1-5. Sampling locations with
Page 27 and 28: Table 1-2. Extent of historical dat
Page 29 and 30: 1-23 an exhaustive data analysis ha
Page 31 and 32: PCBs (ng/g) PCBs (ng/g) PCBs (ng/g)
Page 33: depositional/erosional patterns in
Page 37 and 38: TCDD (ng/g) 0.2 0.16 0.12 0.08 0.04
Page 39 and 40: 1-33 locations indicate that OCDD i
Page 41 and 42: tPAHs (ng/g) tPAHs (ng/g) tPAHs (ng
Page 43 and 44: 1-37 and RM6, there seems to be an
Page 45 and 46: Depth (ft) Depth (ft) 0 2 4 6 8 10
Page 47 and 48: Chromium (ng/g) Chromium (ng/g) Chr
Page 49 and 50: 1-43 westerly section of the Kill v
Page 51 and 52: Arsenic (ng/g) Arsenic (ng/g) Arsen
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