Newark Bay Study - Passaic River Public Digital Library

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1-24 chemicals and biological tissues monitored), spatial (i.e., only few locations covered), and temporal (i.e., not often enough) distribution of information in the Bay. It is the intention of the Field Sampling Program performed by TSI as part of its Remedial Investigation Work Plan (TSI, 2004) to begin to address the data gaps in the study domain. The most pertinent plots are presented and discussed as part of this modeling plan and the main observations about the spatial and temporal relationships that exist within the domain for the selected chemicals are presented below. The discussions are not intended to be exhaustive, but rather a summary of the most important data features and availability. Polychlorinated Biphenyls (PCBs). Figure 1-7 shows total PCBs as the sum of congeners (closed circles ●), sum of homologs (open circles ○), and the sum of coplanar congeners (open triangles ª) in surface sediments and with depth in the Newark Bay-Kill van Kull domain. The data reveals that at every river mile within the Bay and at a few locations in the Kill van Kull, both the 23 ng/g ER-L and the 180 ng/g ER-M values are exceeded. Since they are a specific subset of the PCB congeners, the concentrations of coplanar congeners are systematically lower than the total PCBs. There is no noticeable spatial trend in the surface sediments within Newark Bay. Lower detections were encountered in the Kill van Kull, but very few samples were available for review, some of which did exceed the guidelines. The average total PCB level in Newark Bay surface sediment is 332 ng/g in the top 12 cm, whereas the highest concentration was 1990 ng/g at approximately RM3.8 into the Bay. In general, levels of PCBs decrease slightly with depth, except at the mouth of the Passaic River where deeper sediments (3 to 6 ft and 7 to 13 ft) have concentrations of coplanar PCBs similar to or even exceeding what is observed in surface sediments. Yet, it is not uncommon to find high levels of PCBs in deeper layers of sediments into Newark Bay, as is the case at RM6.9 where concentrations of coplanar PCBs are higher in deeper sediments (3 to 6 ft) than at 0.5 to 3 ft. Note that total PCB measurements are available only for the layer between 0 and 4.5 ft, and are spatially limited to either the mouth of the Passaic River or to a section between RM4 and RM5.2. Vertical concentration profiles on selected cores show different patterns (Figure 1-8). Data from three cores collected close to each other show consistently high surface and subsurface coplanar PCB concentrations in one core 100A-NWB, and decreasing levels with increasing depth in the other cores (99A-NWB and 98A-NWB, northern Newark Bay). In the mid-section of the Bay, decreasing PCB levels with depth were also noted, although in many cases there were no measurements performed on sediments deeper than 4.5 ft. Note that the plotted sediment core concentrations are those reported at the top of the depth intervals, although, like in core number 98A-NWB (mouth of the Passaic River), the sampled intervals are very small: top 0.17 ft, between 2.8 and 2.9 ft, exactly at 4.6 ft, and at 6 ft. The profile of that core, however, suggests that most of the PCBs reside in the upper layer, since it is located in a low depositional area. However, the interpretation of the depth profiles to reconstitute the history of deposition is limited in the absence
PCBs (ng/g) PCBs (ng/g) PCBs (ng/g) PCBs (ng/g) PCBs (ng/g) 10 0 0 0 10 0 0 0 10 0 0 10 0 0 10 0 10 0.1 10 0 1 10 0 0 0 10 0 0 10 0 10 1 0.1 10 0 0 0 10 0 0 10 0 10 1 0.1 10 0 0 0 10 0 0 10 0 10 1 0.1 10 1 0.1 Top 0.02 ft 0 1 2 3 4 5 6 7 8 9 10 River Mile (mi) 0.5 - 3 ft 0 1 2 3 4 5 River Mile (mi) 6 7 8 9 10 0.5 - 4.5 ft 0 1 2 3 4 5 6 7 8 9 10 River Mile (mi) 3 - 6 ft 0 1 2 3 4 5 6 7 8 9 10 River Mile (mi) 7 - 13 ft 0 1 2 3 4 5 6 7 8 9 10 River Mile (mi) Figure 1-7. Longitudinal and vertical profiles of PCBs along the axis of Newark Bay/Kill van Kull. Red line and opposing arrows indicate separation point between the two water bodies and flow direction. Closed circles (●) represent sum of all congeners, open circles (○) represent sum of homolog groups, and open triangles (ª) represent sum of coplanar PCBs. The first mile overlaps with the Lower Passaic River Restoration Project Study Area. ER-M ER-L ER-M ER-L ER-M ER-L ER-M ER-L ER-M ER-L 1-25
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Page 29: 1-23 an exhaustive data analysis ha
Page 33 and 34: depositional/erosional patterns in
Page 35 and 36: TCDD (ng/g) TCDD (ng/g) TCDD (ng/g)
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
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