|
|
Lower Chemical Exceedance Level (LCEL) |
Higher Chemical Exceedance Level (UCEL) |
1993 - 1997 |
1996 - 2000 |
|
Particle Size Fractionation (%ww) |
--- |
--- |
90 (82-98) |
94 (85-99) |
|
Electrochemical Potential (mV) |
--- |
--- |
-93 (-26
to -248) |
-136 (-248
to –41) |
|
Specific Gravity |
--- |
--- |
2.4 (2.1-2.6) |
--- |
|
Total Volatile Solids (%w/w) |
--- |
--- |
8 (6-10) |
8.5 (8.0-9.4) |
|
Total Solids (%w/w) |
--- |
--- |
39 (36-44) |
39 (35-42) |
|
Dry Wet Ratio (w/w) |
--- |
--- |
0.4 (0.3-0.4) |
--- |
|
Chemical Oxygen Demand (mg/kg) |
--- |
--- |
15000 (13000-16000) |
15000 (13000-17000) |
|
Total Carbon (%w/w) |
--- |
--- |
0.6 (0.3-0.7) |
0.6 (0.3-0.7) |
|
Ammonical Nitrogen (mg/kg) |
--- |
--- |
12 (8-19) |
14 (2-34) |
|
Total Kjeldahl Nitrogen (mg/kg) |
--- |
--- |
450 (290-600) |
450 (290-580) |
|
Total Phosphorus (mg/kg) |
--- |
--- |
230 (150-360) |
200 (150-290) |
|
Total Sulphide (mg/kg) |
--- |
--- |
22 (6-67) |
37 (6-110) |
|
Total Cyanide (mg/kg) |
--- |
--- |
0.1 (0.1-0.1) |
<0.1 (<0.1-0.1) |
|
Aluminium (mg/kg) |
--- |
--- |
25000 (18,000-37,000) |
--- |
|
Arsenic (mg/kg) |
12 |
42 |
10.0 (8.2-12.0) |
9.8 (8.4-12.0) |
|
Boron (mg/kg) |
--- |
--- |
26 (15-33) |
--- |
|
Cadmium (mg/kg) |
1.5 |
4 |
0.2 (0.1-0.5) |
0.1 (<0.1-0.1) |
|
Chromium (mg/kg) |
80 |
160 |
38 (34-42) |
40 (34-46) |
|
Copper (mg/kg) |
65 |
110 |
43 (41-49) |
44 (41-49) |
|
Iron (mg/kg) |
--- |
--- |
33000 (31000-36000) |
--- |
|
Lead (mg/kg) |
75 |
110 |
52 (41-62) |
59 (52-64) |
|
Manganese (mg/kg) |
--- |
--- |
620 (540-670) |
--- |
|
Mercury (mg/kg) |
0.5 |
1 |
0.2 (0.1-0.2) |
0.23 (0.15-0.46) |
|
Nickel (mg/kg) (7) |
40 |
40 |
23 (20-26) |
24 (18-30) |
|
Silver (mg/kg) |
1 |
2 |
--- |
<1.0 (<1.0-1.0) |
|
Zinc (mg/kg) |
200 |
270 |
126 (100-140) |
140 (110-150) |
|
Total Polychlorinated Biphenyls (PCBs) |
23 |
180 |
--- |
<5 (<5-5) |
|
Low Molecular Weight Polyaromatic Hydrocarbons
(PAHs) (μg/kg) (3) (5) |
550 |
3160 |
--- |
6 (N.D-17) |
|
High Molecular Weight Polyaromatic Hydrocarbons
(PAHs) (μg/kg) (4) (5) |
1700 |
9600 |
--- |
78 (17-152) |
|
Polycyclic Aromatic Hydrocarbons (μg/kg) |
--- |
--- |
55 (44-68) |
--- |
|
Polychlorinated Biphenyls (μg/kg) |
--- |
--- |
8 (5-19) |
--- |
Notes:
1. Data presented are arithmetic means; data in brackets indicate ranges.
2. All data are based on the analyses of bulk (unsieved) sediment and are reported on a dry weight basis unless stated otherwise.
3. Low molecular weight polyaromatic hydrocarbons (PAHs) include congeners of molecular weight below 200, namely Acenaphthylene, Acenaphthene, Flourene, Phenathrene and Anthracene.
4. High molecular weight polyaromatic hydrocarbons (PAHs) include 10 congeners with molecular weight above 200, namely Fluoranthene, Pyrene, Benzo(a)anthracene, Chrysene, Benzo(b)fluoranthene, Benzo(k)fluorathene, Benzo(a)pyrene, Dibenzo(a,h)anthracene, Benzo(ghi)perylene and Indeno(1,2,3-cd)pyrene.
5. PAHs results are based on sediment samples collected in 1998-2000 only.
6. N.D. Not detected – all congeners are below the detection limit.
7.
When the LCEL and UCEL for a
contaminant are the same, the contaminant level is considered to have exceeded
UCEL if it is greater than the value shown.