2.1
Air quality monitoring,
including 1-hr and 24-hr TSP, was conducted once every six days in
accordance with the EM&A Manual. The
2.2
The Contractor was notified of
the exceedances and reasons by the ET through the
Interim Notifications of Exceedance (NOE).
Recommendations were also provided in the NOE for the Contractor’s actions.
2.3
Table 2.1 presents the number of exceedances
recorded in each month of the reporting quarter. The number of monitoring
events included regular monitoring events and additional ones.
Table 2.1 Summary
of Number of Exceedances
for 1-hr & 24-hr TSP Concentration
|
Monitoring Parameter |
Level of Exceedance |
|
||
|
Apr. 2006 |
May 2006 |
Jun. 2006 |
||
|
1-hr TSP |
No. of monitoring events |
15 |
15 |
18 |
|
Action |
0 |
0 |
0 |
|
|
Limit |
0 |
0 |
0 |
|
|
Total |
0 |
0 |
0 |
|
|
24-hr TSP |
No. of monitoring events |
12 |
10 |
10 |
|
Action |
2 |
1 |
0 |
|
|
Limit |
3 |
1 |
0 |
|
|
Total |
5 |
2 |
0 |
|
2.4
In accordance with the EM&A
Manual, the water quality monitoring was conducted at the impact stations (FM1
and FM2) and the control station (FC1 and FC2) in the reporting quarter.
2.5
Impact water quality monitoring was conducted three days per
week. Measurements were taken at both mid-ebb and mid-flood tides at three
depths (i.e. 1m below surface, mid depth and 1m from seabed). The
2.6
A total of 35 water quality exceedances
were recorded in the reporting quarter, 6 in April,
13 in May and
16 in June 2006.
2.7
Field observation confirmed that no sediment plume observed
from the Fill Bank. The recorded levels were within the respective baseline
data range. The exceedances were due to natural
variation and not Project-related.
2.8
Table 2.2 tabulates the total number of water quality exceedances in the reporting quarter. The trend of water
quality over the past quarter is depicted in Appendix E.
Table 2.2 Total
Number of Water Quality Exceedances in the Quarter
|
Parameter |
Exceedance Level |
Apr 06 |
May 06 |
Jun 06 |
|
Number
of monitoring days |
14 |
13 |
12 |
|
|
DO
(S&M) |
Action |
0 |
0 |
1 |
|
Limit |
0 |
0 |
0 |
|
|
Total |
0 |
0 |
1 |
|
|
DO(B) |
Action |
0 |
0 |
0 |
|
Limit |
0 |
0 |
0 |
|
|
Total |
0 |
0 |
0 |
|
|
Turbidity |
Action |
0 |
3 |
6 |
|
Limit |
0 |
1 |
2 |
|
|
Total |
0 |
4 |
8 |
|
|
SS |
Action |
3 |
6 |
5 |
|
Limit |
3 |
3 |
2 |
|
|
Total |
6 |
9 |
7 |
|
|
Total
number of DO, Turbidity and SS exceedances |
Action |
3 |
9 |
12 |
|
Limit |
3 |
4 |
4 |
|
|
Total |
6 |
13 |
16 |
|
2.9
A comparison between the quarterly mean/median of SS and the
1.3 times of the baseline mean was made for each tide at each station. The
statistical analysis results are given in Appendix F. Monitoring stations with
significant difference (p<0.05) is summarized in Table 2.3. It was observed
a generally better water quality was resulted in the reporting quarter in
respect to 130% of the baseline mean/median.
Table
2.3 Summary
of Statistically Significant Results of SS
|
Monitoring Station |
Significant difference? |
||
|
Mid-ebb |
Mid-flood |
||
|
Designated
Control Station |
FC1 |
Y |
N |
|
FC2 |
Y |
N |
|
|
Designated
Monitoring Station |
FM1 |
N |
N |
|
FM2 |
Y |
N |
|