Drainage SERvices department
CONTRACT NO. HATS 07/2023 ENVIRONMENTAL TEAM FOR HUNG SHUI KIU EFFLUENT POLISHING PLANT PHASE 1
BASELINE MONITORING REPORT
2.3 Monitoring Parameters, Frequency, and Duration
3.3 Monitoring Parameters, Frequency and Duration
Figure
1
|
Locations of
Construction Dust Monitoring Stations
|
Figure
2
|
Locations of
Stream Water Quality Monitoring Stations for Construction Phase
|
Figure
3
|
Locations of
Water Quality Monitoring Stations Under Operation Phase (Urmston Road Outfall
Discharge)
|
Figure
4
|
Locations of
Water Quality Monitoring Station Under Operation Phase (Tin Shui Wai Nullah
Discharge)
|
Appendix
A1
|
Calibration Certificates for Air Quality Monitoring Equipment
|
Appendix
A2
|
Wind Data and Rainfall Record From Hong Kong Observatory Weather
Station
|
Appendix
A3
|
Baseline Air Quality Monitoring Results
|
Appendix
B1
|
Calibration Certificates for Water Quality Monitoring Equipment
|
Appendix
B2
|
Baseline Water Quality Monitoring Schedule
|
Appendix
B3
|
HOKLAS-accreditation Certificate of the Testing Laboratory and
Laboratory Results
|
Appendix
b4
|
Stream Water Quality Monitoring Results
|
Appendix
b5
|
Marine Water Quality Monitoring Results
|
In accordance with the approved Environmental Monitoring and Audit Manual (EM&A Manual) for the Project, baseline environmental monitoring should be conducted prior to the commencement of construction works. According to the Section 4.6.1.3 of EM&A Manual, Baseline Monitoring Report should be submitted within 10 working days from the completion of baseline monitoring work. A Method Statement which provides the details of monitoring methodology, equipment, monitoring locations and criteria for the baseline water quality monitoring was agreed by EPD on 3 July 2024.
The baseline air quality monitoring was carried out 3 times per day for 2 weeks between 24 June 2024 and 7 July 2024, and the baseline water quality monitoring was carried out 3 days per week for 4 weeks between 24 June 2024 and 20 July 2024.
1.1.1 The Hung Shui Kiu Effluent Polishing Plant (HSKEPP) (the Project) which is located in the north-western side of the Hung Shiu Kiu / Ha Tsuen New Development Area (HSK/HT NDA). It is designed to provide reliable, adequate and quality sewage treatment and sewage effluent disposal for the sewage collected from the new developments within the HSK/HT NDA and other developments on the North West New Territories (NWNT).
1.1.2 An Environmental Impact Assessment (EIA) study for the Project was conducted in accordance with EIA Study Brief No. ESB-312/2019 and the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM). The EIA Report and Environmental Monitoring and Audit (EM&A) Manual (Register No. AEIAR – 240/2022) were approved with conditions on 19 October 2022 under the Environmental Impact Assessment Ordinance (EIAO), with an Environmental Permit (EP) granted on 19 October 2022 (EP No. EP-608/2022).
1.1.3 The key elements of the Project as assessed in the EIA Report are listed below:
Ÿ Demolition of existing structures and buildings within San Wai Preliminary Treatment Works (SWPTW) for construction of HSKEPP facilities;
Ÿ Construction of a sewage treatment plant with a maximum capacity of Average Dry Weather Flow (ADWF) up to 90,000 m3/day;
Ÿ Construction of sludge treatment facilities for treating sludge generated from Hung Shui Kiu (HSK) Effluent Polishing Plant (EPP) and additional sludge generated from the San Wai Sewage Treatment Works (STW) and other nearby STWs;
Ÿ Construction of facilities for receiving and co-digesting pre-treated food or organic wastes;
Ÿ Construction of effluent discharge pipe connecting to the existing discharge tunnel of San Wai STW; and
Ÿ Associated ancillary works.
1.1.4 According to the approved EM&A Manual of the Project, baseline monitoring should be carried out to review the ambient 1-hour Total Suspended Particulates (TSP) levels and water quality baseline condition at the monitoring locations for the determination of the appropriate Action levels with the Limit levels set against statutory or otherwise agreed limits prior to the commencement of impact monitoring during construction phase of the Project. The baseline air quality monitoring was carried out for at least 14 consecutive days in June 2024 and the baseline water quality monitoring was carried out for at least 3 days per week for 4 consecutive weeks.
1.2.1 This Baseline Monitoring Report represents the monitoring locations, equipment, period, methodology, results and observations during the baseline monitoring period.
1.2.2 The purposes of this Report are to:
Ÿ Summarise the findings of baseline monitoring for air and water quality; and
Ÿ Establish the Action and Limit (A/L) levels in accordance with the EM&A Manual for the subsequent impact monitoring during construction stage.
1.3.1 This Report comprises the following sections:
Ÿ Section 1 introduces the background of the Project and purpose of this Report;
Ÿ Section 2 presents the baseline monitoring requirements, methodologies, and monitoring results of air quality;
Ÿ Section 3 presents the baseline monitoring requirements, methodologies, and monitoring results of water quality; and
Ÿ Section 4 concludes the findings of the baseline monitoring.
2.1.1 According to the EM&A Manual, baseline monitoring of 1-hr Total Suspended Particulate (TSP) levels should be monitored and audited. TSP baseline monitoring should be carried out for a continuous period of at least two weeks with three sets of 1-hour ambient measurement taken daily at the designated monitoring stations prior to the commissioning of major construction works.
2.1.2 Baseline air quality monitoring was conducted between 24 June 2024 and 7 July 2024 at three designated monitoring stations.
2.2.1 Portable direct reading dust meter was used to measure 1-hr average TSP monitoring. The portable direct reading dust meters used in the baseline monitoring had been agreed by the Independent Environmental Checker (IEC) in accordance with the provision and requirements set out in the EM&A Manual. Copies of calibration certificates were attached in Appendix A1. Table 2-1 summarises the equipment and brand used in the baseline air quality monitoring programme.
Table 2‑1 Air Quality Monitoring Equipment
|
Equipment |
Brand and Model |
Quantity |
Serial Number |
|
Portable direct reading dust meter (1-hr TSP) |
TSI Handheld TSP Meter (Model No.: AM520) |
3 |
1. 5201735004 2. 5201735006 3. 5202345003 |
2.2.2 The 1-hour portable direct reading dust meters were calibrated at 1-year interval against a Tisch Environmental Mass Flow Controlled TSP High Volume Sampler to check the validity and accuracy of the results measured by direct reading method.
2.3.1 Table 2-2 summarises the monitoring parameters, frequency and duration of baseline TSP monitoring.
Table 2‑2 Summary of Monitoring Parameter, Frequency and Duration
|
Parameter |
Duration |
Frequency |
|
1-hr TSP |
Consecutive days of at least 2 weeks before commencement of major construction works |
3 times per day |
2.4.1 The location of the monitoring stations was tabulated in Tale 2-3 and illustrated in Figure 1.
Table 2‑3 Location of Air Quality Monitoring Station
|
Monitoring Station ID |
Description |
Remark |
|
AM1 |
Tseung Kong Wai |
· No major source of TSP was observed. · Baseline monitoring was conducted at the ground level to represent the worst-case dust impact. |
|
AM2 |
Farm House |
· No major source of TSP was observed. · Baseline monitoring was conducted at the ground level to represent the worst-case dust impact. |
|
AM3 |
Planned Port Back-up, Storage and Workshop |
· No major source of TSP was observed. · Baseline monitoring was conducted at the ground level to represent the worst-case dust impact. |
2.5.1 The 1-hr TSP was sampled by drawing air into the portable dust monitor where particulate concentrations were measured instantaneously with an in-built silicon detector sensing light scattered by the particulates in the sampled air. Continuous TSP levels were indicated and logged by a built-in data logger compatible with Windows based program to facilitate data collection, analysis and reporting.
2.5.2 The measuring procedures of the 1-hour dust meter was undertaken in accordance with the Manufacturer’s Instruction Manual as follows:
Ÿ Power on the meter
Ÿ Check the date and time
Ÿ Check the battery and make sure it is good enough to complete the sampling
Ÿ Select the “Calibration” from the menu
Ÿ Plug in the zero calibration filter to the meter
Ÿ Select the “Zero Cal” and run it
Ÿ Back to main menu and select the “Run Mode/Manual Mode”
Ÿ Press “Enter” to start the sampling
Ÿ When sampling is completed, press the “Enter” to stop the sampling
Ÿ Back to the main menu and select the “Data”
Ÿ Select the “Statistics” and read back the last memory record
2.5.3 Adoption of the wind data from the existing automatic wind station, i.e. Lau Fau Shan, operated by Hong Kong Observatory (HKO) rather than setting up wind data monitoring equipment is based on the following justifications:
Ÿ Lau Fau Shan automatic wind station is located in the vicinity of the designated monitoring locations. This Automatic wind station (22°28'08", 113°59'01") is located at the north of the Project and the anemometer is set up at 31m above mean sea level.
Ÿ This automatic wind station is considered as the closest wind station to the Project areas that can provide representative wind data in Hung Shui Kiu areas.
Ÿ Wind data collected by HKO was considered as a reliable data source for the wind data, it is widely used in many EM&A projects (e.g. Expansion of Hong Kong International Airport into a Three-runway System, Siu Ho Wan Station and Siu Ho Wan Depot Replanning Works – Advance Construction Works). The data set is more accurate and reliable that could be downloaded periodically with real-timed data logger.
2.5.4 The data collected from Lau Fau Shan Wind Station were used to check the wind speed and wind direction. Details of the collected wind data were presented in Appendix A2.
2.5.5 General meteorological conditions (i.e. prevailing wind condition and precipitation) and observations of any significant nearby dust source(s) during the baseline monitoring were also recorded.
2.6.1 The baseline air quality monitoring at AM1, AM2 and AM3 were conducted between 24 June 2024 and 7 July 2024.
2.6.2 The baseline air quality monitoring results for 1-hr TSP were summarised in Table 2-4. The detailed TSP monitoring data presentations were presented in Appendix A3.
Table 2‑4 Summary of 1-hr TSP Baseline Monitoring Results
|
1-hr TSP Levels |
Monitoring Station ID |
||
|
AM1 |
AM2 |
AM3 |
|
|
Average (µg/m3) |
20.0 |
16.4 |
20.6 |
|
Range (µg/m3) |
5.0 – 52.0 |
1.0 – 49.0 |
4.0 – 57.0 |
2.7.1 The air quality monitoring results of 1-hr TSP were well below the Limit Level set out in the EM&A Manual respectively at the monitoring locations. The A/L for air quality impact monitoring were established according to the criteria and methodology in the EM&A Manual as presented in Table 2-5.
Table 2‑5 Guidelines for Establishing Action and Limit Level for Air Quality
|
Parameter |
Action Level |
Limit Level |
|
1-hour TSP Level |
For baseline level ≤ 384µg/m3, Action Level = (Baseline level * 1.3 + Limit level)/2, For baseline level > 384µg/m3, Action Level = Limit level |
500 µg/m3 |
2.7.2 Table 2.6 shows the derived A/L Levels for air quality impact monitoring during the construction of the Project.
Table 2‑6 Action and Limit Levels for Dust Level
|
Parameter |
Monitoring Station ID |
Action Level (µg/m3) |
Limit Level (µg/m3) |
|
1-hr TSP Level |
AM1 |
263.0 |
500 |
|
AM2 |
260.6 |
500 |
|
|
AM3 |
263.4 |
500 |
3.1.1 According to the monitoring methodology as stipulated for baseline and impact water quality monitoring in the EM&A Manual and EP, baseline water quality monitoring was undertaken to establish the baseline water quality levels at the designated monitoring stations. The baseline monitoring was conducted 3 days per week for at least 4 weeks prior to the commencement of the works. The interval between two sets of monitoring was not less than 36 hours.
3.1.2 Marine Water Quality Baseline Monitoring was conducted at W1, W2, W3, W4, W5. W6, W7, W8 within North Western WCZ, and E24A, E25, E26, E27A, E28A, DB1, SP1, and KT1 within Inner Deep Bay at mid-ebb and mid-flood tides. Stream Water Quality Baseline Monitoring was also conducted at C1 and M1. Water depths, namely, 1m below water surface, mid-depth and 1m above sea/riverbed, except where the water depth was less than 6m, in which case the mid-depth station was omitted. If the water depth was less than 3m, only the mid-depth would be monitored. The baseline water quality monitoring was conducted between 24 June 2024 and 20 July 2024.
3.2.1 Based on the Method Statement, the monitoring equipment in Table 3-1 were used for the in-situ measurement of water quality. Copies of the calibration certificates for water quality monitoring equipment were provided in Appendix B1.
Table 3‑1 Water Quality Monitoring Equipment
|
Equipment |
Model |
|
DO and Temperature Meter, Salinity Meter, pH meter and Turbidimeter |
YSI ProDSS Multi Parameters |
|
Serial Number |
1. 15M100005 2. 16H104233 3. 21G105356 4. 21K101468 |
|
Positioning Equipment |
Xyorca XY-453 (S/N: OA35000025) |
|
Water Sampler |
1120-1180 Vertical AlphaTM Bottles |
3.3.1 Table 3-2 and Table 3-3 summarise the monitoring parameters, frequency, and duration of the baseline water quality monitoring. The monitoring schedule was provided in Appendix B2.
Table 3‑2 Stream Water Quality Monitoring Parameter, Frequency and Duration
|
Parameter |
Frequency and Duration |
|
In-situ measurements: Dissolved Oxygen, Temperature, pH, Turbidity, Laboratory measurements: Suspended Solids (SS) |
3 days per week for four weeks (12 days) prior to the commencement of construction works |
Table 3‑3 Marine Water Quality Monitoring Parameter, Frequency and Duration
|
Parameter |
Frequency and Duration |
|
In-situ measurements: Dissolved Oxygen, Salinity, Temperature, pH, Turbidity, Laboratory measurements: Suspended Solids (SS), Biochemical Oxygen Demand (BOD5), Ammonia Nitrogen (NH3-N), Nitrite Nitrogen (NO2-N), Nitrate Nitrogen (NO3-N), Total Inorganic Nitrogen (TIN), Total Kjeldahl Nitrogen (TKN), Total Nitrogen (TN), Total Phosphorus (TP), E.coli |
3 days per week at mid-flood and mid-ebb tides for four weeks (12 days) prior to the commencement of construction works |
3.4.1 In accordance with the Method Statement, the monitoring was conducted at all designated monitoring stations as shown in Table 3-4. The locations of the monitoring stations for stream were shown in Figure 2 and the locations of the monitoring stations for marine water were shown Figure 3 and Figure 4.
Table 3‑4 Locations of Water Quality Impact Stations
|
Monitoring Station ID |
Description |
Coordinates |
|
|
Easting |
Northing |
||
|
C1 |
Control station at upstream location of construction site for stream water quality monitoring during construction phase |
816278 |
834038 |
|
M1 |
Impact station at downstream location of construction site for stream water quality monitoring during construction phase |
816571 |
833970 |
|
W1 |
Location within the North Western WCZ |
808231 |
827494 |
|
W2 |
Location within the North Western WCZ |
807469 |
828888 |
|
W3 |
Location within the North Western WCZ |
807221 |
823737 |
|
W4 |
Location within the North Western WCZ |
806309 |
829988 |
|
W5 |
Location within the North Western WCZ |
809062 |
824638 |
|
W6 |
Location within the North Western WCZ |
807066 |
825034 |
|
W7 |
Location within the North Western WCZ |
805592 |
828162 |
|
W8 |
Location within the North Western WCZ |
805412 |
829400 |
|
E24A(1) |
Oyster Culture Area |
815892 |
837253 |
|
E25 |
Mangroves (Inner Deep Bay) |
820238 |
838028 |
|
E26 |
Ma Po Marshes SSSI |
821036 |
837913 |
|
E27A(1) |
Mai Po Inner Deep Bay Ramsar Site / Inner Deep Bay SSSI |
819535 |
838830 |
|
E28A(1) |
Mangroves along Shan Pui River |
821073 |
836610 |
|
DB1 |
Inner Deep Bay |
814631 |
836460 |
|
SP1 |
Shan Pui River, upstream of discharge point |
821192 |
835933 |
|
KT1 |
Kam Tin River, upstream of discharge point |
821526 |
836682 |
Remark:
(1) E24, E27 and E28 were found inaccessible due to safety reason with significant low water depth (<0.9m). Alternative locations E24A (i.e. ~150m west of E24), E27A (i.e. ~600m west of E27) and E28A (i.e. ~50m east of E28) were proposed based on the criteria as stipulated in Section 4.5.2.6 of the EM&A Manual. The locations of E24A, E27A and E28A were considered as representative monitoring stations for Oyster Culture Area, Mai Po Inner Deep Bay Ramsar Site / Inner Deep Bay SSSI, and Mangroves along Shan Pui River, respectively. The relocation of E27 was approved by EPD on 21 June 2024 whereas the relocation of E24 and E28 were approved by EPD on 3 July 2024.
3.5.1 The procedures adopted for dissolved oxygen (DO), temperature, turbidity, pH, salinity and suspended solids (SS), Biochemical Oxygen Demand (BOD5), Ammonia Nitrogen (NH3-N), Nitrite Nitrogen (NO2-N), Nitrate Nitrogen (NO3-N), Total Inorganic Nitrogen (TIN), Total Kjeldahl Nitrogen (TKN), Total Phosphorus (TP), Total Nitrogen (TN), and E.coli measurement followed the Method Statement and were discussed in the following sections.
Instrumentation
3.5.2 The in-situ water quality parameters, viz. DO, temperature, turbidity, pH and salinity were measured by a multi-parameter meter (YSI ProDSS Multi Parameters).
Operating/Analytical Procedures
3.5.3 Based on the in-situ measurement, 18 water monitoring stations including 10 stations (i.e. C1, M1, DB1, E24A, E25, E26, E27A, E28A, KT1 and SP1) had water depth of less than 3m while the rest of the water monitoring stations had water depths between 3m and 6m. The measurements and samplings at the mid-depth station was omitted for those monitoring stations water depth between 3m and 6m, while only the mid-depth station was monitored at those monitoring stations with water depth of less than 3m.
3.5.4 At each sampling depth, at least duplicate readings of dissolved oxygen content and turbidity were taken. The probes were retrieved out of the water after the first measurement and then re-deployed for the second measurement.
3.5.5 Duplicate water samples for Suspended Solids (SS), Biochemical Oxygen Demand (BOD5), Ammonia Nitrogen (NH3-N), Nitrite Nitrogen (NO2-N), Nitrate Nitrogen (NO3-N), Total Inorganic Nitrogen (TIN), Total Kjeldahl Nitrogen (TKN), Total Phosphorus (TP), Total Nitrogen (TN), and E.coli were collected by water samplers and stored in polyethylene bottles. Sampling bottles were pre-rinsed with the same water samples. The sample bottles were then packed into a cool box kept at 4oC and delivered to a HOKLAS accredited laboratory, ALS Technichem (HK) Pty Ltd. follow the standard methods according to Table 3-5 and as described in “American Public Health Association (APHA Standard Methods for the Examination of Water and Wastewater”, 21st edition, unless otherwise specified. The results for laboratory analysis of determinant and the HOKLAS-accreditation Certificate of this testing laboratory were represented in Appendix B3.
Table 3‑5 Analytical Methods to be Applied to Water Quality Samples
|
Determinant |
Standard Method |
|
Suspended Solids |
APHA 2540 D |
|
Ammonia as N |
APHA 4500 NH3 G |
|
Nitrite as N |
APHA 4500 NO3: I |
|
Nitrate as N |
APHA 4500 NO3: I |
|
Total Kjeldahl Nitrogen as N |
APHA 4500 P: J, APHA 4500 NO3: I |
|
Total Nitrogen as N |
APHA 4500 P: J, NO3: I |
|
Total Inorganic Nitrogen as N (NOx + NH3) |
APHA 4500 NH3 G, APHA 4500 NO3: I, |
|
Total Phosphorus as P |
APHA 4500 P: J |
|
Escherichia coli |
TM09/EC/10/98 Issue 3, HKEPD |
|
Biochemical Oxygen Demand (BOD5) |
APHA 5210 B |
Maintenance and Calibration
3.5.6 Before each round of monitoring, the dissolved oxygen probe of YSI (YSI ProDSS Multi Parameters) was calibrated by the web bulb method.
3.5.7 The monitoring instruments were checked, calibrated, and certified by a laboratory accredited under HOKLAS before use and subsequently re-calibrated at 3-monthly intervals throughout baseline water quality monitoring.
3.6.1 The baseline water quality monitoring at the designated monitoring stations were conducted between 24 June 2024 and 20 July 2024. A summary of stream baseline water quality monitoring results was given in Table 3-6. Summary of the in-situ measurement for marine baseline water quality monitoring in mid-ebb and mid-flood conditions was given in Table 3-7 and Table 3-8 respectively. Summary of the laboratory analysis for marine baseline water quality monitoring in mid-ebb and mid-flood conditions was given in Table 3-9 and Table 3-10 respectively. Details of stream water quality monitoring and marine water quality monitoring results were presented in Appendix B4 and Appendix B5 respectively.
3.6.2 The weather conditions during the monitoring period were mainly fine and sunny. Stream conditions throughout the monitoring days were consistently moderate. No major pollution sources, which might affect the results, were observed in the vicinity during the baseline monitoring.
Table 3‑6 Summary of Baseline Stream Water Quality Monitoring Results
|
Monitoring Station ID |
pH |
Dissolved Oxygen (mg/L) |
Dissolved Oxygen Saturation (%) |
Turbidity (NTU) |
Suspended Solid (mg/L) |
|
|
C1 |
Avg. |
7.1 |
4.6 |
59.3 |
2.8 |
3 |
|
Min. |
6.7 |
2.3 |
28.4 |
0.6 |
2 |
|
|
Max |
7.4 |
8.4 |
110.8 |
6.5 |
5 |
|
|
M1 |
Avg. |
7.3 |
5.3 |
66.9 |
8.5 |
10 |
|
Min. |
7.1 |
3.7 |
47.9 |
3.2 |
2 |
|
|
Max |
7.4 |
6.6 |
83.7 |
17.8 |
26 |
|
Table 3‑7 Summary of Baseline Marine Water Quality Monitoring Results for In-situ Measurements (Mid-Ebb)
|
Monitoring Station ID |
pH |
Salinity (ppt) |
Dissolved Oxygen Saturation (%) |
Dissolved Oxygen (mg/L) |
Turbidity (NTU) |
|
|
W1 |
Avg. |
7.9 |
19.1 |
75.8 (Surface & Middle) |
5.4 (Surface & Middle) |
5.5 |
|
45.9 (Bottom) |
3.2 (Bottom) |
|||||
|
Min. |
7.6 |
5.8 |
40.7 (Surface & Middle) |
2.8 (Surface & Middle) |
1.0 |
|
|
31.8 (Bottom) |
2.2 (Bottom) |
|||||
|
Max |
8.6 |
29.8 |
110.9 (Surface & Middle) |
7.8 (Surface & Middle) |
16.7 |
|
|
67.1 (Bottom) |
4.7 (Bottom) |
|||||
|
W2 |
Avg. |
7.9 |
19.6 |
73.8 (Surface & Middle) |
5.3 (Surface & Middle) |
6.2 |
|
38.9 (Bottom) |
2.7 (Bottom) |
|||||
|
Min. |
7.6 |
4.5 |
47.0 (Surface & Middle) |
3.3 (Surface & Middle) |
1.1 |
|
|
21.0 (Bottom) |
1.5 (Bottom) |
|||||
|
Max |
8.6 |
32.2 |
104.5 (Surface & Middle) |
7.5 (Surface & Middle) |
15.0 |
|
|
59.7 (Bottom) |
4.2 (Bottom) |
|||||
|
W3 |
Avg. |
7.8 |
16.3 |
76.4 (Surface & Middle) |
5.5 (Surface & Middle) |
4.7 |
|
54.5 (Bottom) |
3.9 (Bottom) |
|||||
|
Min. |
7.5 |
5.1 |
56.6 (Surface & Middle) |
4.0 (Surface & Middle) |
0.9 |
|
|
28.6 (Bottom) |
2.0 (Bottom) |
|||||
|
Max |
8.4 |
26.5 |
110.6 (Surface & Middle) |
7.9 (Surface & Middle) |
11.8 |
|
|
74.5 (Bottom) |
5.5 (Bottom) |
|||||
|
W4 |
Avg. |
7.8 |
20.0 |
69.2 (Surface & Middle) |
5.0 (Surface & Middle) |
7.5 |
|
37.2 (Bottom) |
2.6 (Bottom) |
|||||
|
Min. |
7.5 |
2.6 |
39.2 (Surface & Middle) |
2.7 (Surface & Middle) |
1.0 |
|
|
24.7 (Bottom) |
1.7 (Bottom) |
|||||
|
Max |
8.4 |
31.6 |
97.4 (Surface & Middle) |
7.0 (Surface & Middle) |
19.5 |
|
|
59.8 (Bottom) |
4.2 (Bottom) |
|||||
|
W5 |
Avg. |
7.9 |
22.5 |
68.0 (Surface & Middle) |
4.9 (Surface & Middle) |
5.3 |
|
35.9 (Bottom) |
2.5 (Bottom) |
|||||
|
Min. |
7.6 |
6.9 |
31.2 (Surface & Middle) |
2.2 (Surface & Middle) |
0.6 |
|
|
19.9 (Bottom) |
1.4 (Bottom) |
|||||
|
Max |
8.7 |
33.5 |
109.5 (Surface & Middle) |
7.8 (Surface & Middle) |
17.1 |
|
|
57.2 (Bottom) |
4.0 (Bottom) |
|||||
|
W6 |
Avg. |
7.8 |
17.9 |
73.8 (Surface & Middle) |
5.3 (Surface & Middle) |
6.0 |
|
49.5 (Bottom) |
3.5 (Bottom) |
|||||
|
Min. |
7.6 |
4.8 |
46.9 (Surface & Middle) |
3.3 (Surface & Middle) |
1.3 |
|
|
32.8 (Bottom) |
2.3 (Bottom) |
|||||
|
Max |
8.4 |
29.6 |
117.6 (Surface & Middle) |
8.4 (Surface & Middle) |
14.9 |
|
|
68.9 (Bottom) |
4.9 (Bottom) |
|||||
|
W7 |
Avg. |
7.8 |
13.7 |
74.3 (Surface & Middle) |
5.4 (Surface & Middle) |
8.9 |
|
62.5 (Bottom) |
4.5 (Bottom) |
|||||
|
Min. |
7.5 |
4.6 |
56.4 (Surface & Middle) |
4.0 (Surface & Middle) |
1.7 |
|
|
50.1 (Bottom) |
3.5 (Bottom) |
|||||
|
Max |
8.4 |
23.6 |
97.6 (Surface & Middle) |
7.0 (Surface & Middle) |
18.8 |
|
|
79.6 (Bottom) |
6.0 (Bottom) |
|||||
|
W8 |
Avg. |
7.8 |
13.1 |
74.5 (Surface & Middle) |
5.5 (Surface & Middle) |
8.8 |
|
59.8 (Bottom) |
4.3 (Bottom) |
|||||
|
Min. |
7.6 |
3.1 |
55.0 (Surface & Middle) |
3.9 (Surface & Middle) |
2.2 |
|
|
44.5 (Bottom) |
3.1 (Bottom) |
|||||
|
Max |
8.4 |
24..3 |
97.0 (Surface & Middle) |
7.0 (Surface & Middle) |
22.4 |
|
|
74.9 (Bottom) |
5.6 (Bottom) |
|||||
|
DB1 |
Avg. |
7.9 |
9.2 |
100.1 |
7.1 |
16.4 |
|
Min. |
7.4 |
6.2 |
81.6 |
5.8 |
2.7 |
|
|
Max |
8.4 |
16.0 |
148.6 |
10.3 |
39.8 |
|
|
E24A |
Avg. |
8.0 |
7.9 |
100.6 |
7.1 |
22.7 |
|
Min. |
7.3 |
3.0 |
77.8 |
5.5 |
6.8 |
|
|
Max |
8.4 |
15.8 |
147.3 |
10.3 |
45.7 |
|
|
E25 |
Avg. |
7.6 |
2.3 |
74.4 |
5.4 |
36.9 |
|
Min. |
7.2 |
0.7 |
30.5 |
2.3 |
16.1 |
|
|
Max |
8.0 |
6.5 |
128.5 |
9.3 |
60.4 |
|
|
E26 |
Avg. |
7.5 |
1.5 |
58.9 (Surface & Middle) |
4.3 (Surface & Middle) |
47.7 |
|
58.9 (Bottom) |
4.3 (Bottom) |
|||||
|
Min. |
7.1 |
0.6 |
21.9 (Surface & Middle) |
1.6 (Surface & Middle) |
20.5 |
|
|
20.5 (Bottom) |
1.5 (Bottom) |
|||||
|
Max |
7.9 |
3.7 |
105.6 (Surface & Middle) |
7.7 (Surface & Middle) |
105.9 |
|
|
106.2 (Bottom) |
7.8 (Bottom) |
|||||
|
E27A |
Avg. |
7.7 |
2.9 |
77.6 |
5.7 |
44.9 |
|
Min. |
7.3 |
1.0 |
32.5 |
2.4 |
11.6 |
|
|
Max |
8.0 |
8.5 |
106.7 |
7.8 |
119.2 |
|
|
E28A |
Avg. |
7.4 |
1.2 |
46.7 |
3.4 |
55.2 |
|
Min. |
7.1 |
0.5 |
16.6 |
1.2 |
26.6 |
|
|
Max. |
7.6 |
2.4 |
87.4 |
6.4 |
89.6 |
|
|
KT1 |
Avg. |
7.5 |
1.1 |
53.8 |
4.0 |
48.1 |
|
Min. |
7.1 |
0.3 |
20.7 |
1.5 |
18.1 |
|
|
Max |
7.7 |
3.0 |
94.7 |
7.0 |
93.5 |
|
|
SP1 |
Avg. |
7.4 |
1.1 |
44.2 |
3.3 |
56.5 |
|
Min. |
7.1 |
0.3 |
14.5 |
1.1 |
32.1 |
|
|
Max |
7.6 |
2.4 |
87.8 |
6.5 |
88.5 |
|
Table 3‑8 Summary of Baseline Marine Water Quality Monitoring Results for In-situ Measurements (Mid-Flood)
|
Monitoring Station ID |
pH |
Salinity (ppt) |
Dissolved Oxygen Saturation (%) |
Dissolved Oxygen (mg/L) |
Turbidity (NTU) |
|
|
W1 |
Avg. |
7.9 |
19.6 |
70.8 (Surface & Middle) |
5.1 (Surface & Middle) |
6.0 |
|
43.5 (Bottom) |
3.0 (Bottom) |
|||||
|
Min. |
7.6 |
3.7 |
36.8 (Surface & Middle) |
2.6 (Surface & Middle) |
1.4 |
|
|
17.4 (Bottom) |
1.2 (Bottom) |
|||||
|
Max |
8.2 |
31.8 |
106.9 (Surface & Middle) |
7.6 (Surface & Middle) |
15.3 |
|
|
62.1 (Bottom) |
4.3 (Bottom) |
|||||
|
W2 |
Avg. |
7.9 |
19.2 |
71.4 (Surface & Middle) |
5.2 (Surface & Middle) |
7.1
|
|
42.4 (Bottom) |
3.0 (Bottom) |
|||||
|
Min. |
7.6 |
2.5 |
39.6 (Surface & Middle) |
2.8 (Surface & Middle) |
1.9 |
|
|
22.4 (Bottom) |
1.5 (Bottom) |
|||||
|
Max |
8.3 |
31.8 |
102.4 (Surface & Middle) |
7.3 (Surface & Middle) |
16.2 |
|
|
62.2 (Bottom) |
4.3 (Bottom) |
|||||
|
W3 |
Avg. |
7.8 |
16.2 |
74.4 (Surface & Middle) |
5.4 (Surface & Middle) |
6.2 |
|
54.7 (Bottom) |
3.9 (Bottom) |
|||||
|
Min. |
7.5 |
6.7 |
56.2 (Surface & Middle) |
4.0 (Surface & Middle) |
1.2 |
|
|
32.5 (Bottom) |
2.3 (Bottom) |
|||||
|
Max |
8.3 |
26.3 |
106.5 (Surface & Middle) |
7.6 (Surface & Middle) |
16.5 |
|
|
70.4 (Bottom) |
5.1 (Bottom) |
|||||
|
W4 |
Avg. |
7.8 |
19.8 |
65.1 (Surface & Middle) |
4.7 (Surface & Middle) |
7.8 |
|
38.0 (Bottom) |
2.7 (Bottom) |
|||||
|
Min. |
7.6 |
1.8 |
22.8 (Surface & Middle) |
1.6 (Surface & Middle) |
2.0 |
|
|
22.1 (Bottom) |
1.5 (Bottom) |
|||||
|
Max |
8.2 |
32.1 |
97.2 (Surface & Middle) |
7.1 (Surface & Middle) |
16.1 |
|
|
61.6 (Bottom) |
4.3 (Bottom) |
|||||
|
W5 |
Avg. |
7.9 |
20.1 |
71.0 (Surface & Middle) |
5.1 (Surface & Middle) |
5.5 |
|
39.0 (Bottom) |
2.7 (Bottom) |
|||||
|
Min. |
7.6 |
4.9 |
31.0 (Surface & Middle) |
2.2 (Surface & Middle) |
1.2 |
|
|
18.6 (Bottom) |
1.3 (Bottom) |
|||||
|
Max |
8.4 |
33.2 |
120.9 (Surface & Middle) |
8.6 (Surface & Middle) |
12.8 |
|
|
57.5 (Bottom) |
4.0 (Bottom) |
|||||
|
W6 |
Avg. |
7.8 |
17.2 |
74.0 (Surface & Middle) |
5.3 (Surface & Middle) |
6.1 |
|
53.5 (Bottom) |
3.8 (Bottom) |
|||||
|
Min. |
7.5 |
2.7 |
50.7 (Surface & Middle) |
3.6 (Surface & Middle) |
0.6 |
|
|
44.2 (Bottom) |
3.1 (Bottom) |
|||||
|
Max |
8.3 |
26.8 |
121.7 (Surface & Middle) |
8.7 (Surface & Middle) |
16.7 |
|
|
72.3 (Bottom) |
5.2 (Bottom) |
|||||
|
W7 |
Avg. |
7.8 |
14.5 |
72.9 (Surface & Middle) |
5.3 (Surface & Middle) |
9.2 |
|
58.9 (Bottom) |
4.2 (Bottom) |
|||||
|
Min. |
7.5 |
3.8 |
49.6 (Surface & Middle) |
3.5 (Surface & Middle) |
1.9 |
|
|
45.8 (Bottom) |
3.2 (Bottom) |
|||||
|
Max |
8.1 |
26.0 |
93.0 (Surface & Middle) |
6.8 (Surface & Middle) |
19.8 |
|
|
78.5 (Bottom) |
5.9 (Bottom) |
|||||
|
W8 |
Avg. |
7.8 |
14.0 |
72.8 (Surface & Middle) |
5.3 (Surface & Middle) |
8.4 |
|
60.1 (Bottom) |
4.3 (Bottom) |
|||||
|
Min. |
7.6 |
4.7 |
45.9 (Surface & Middle) |
3.2 (Surface & Middle) |
2.6 |
|
|
38.9 (Bottom) |
2.7 (Bottom) |
|||||
|
Max |
8.2 |
27.2 |
95.1 (Surface & Middle) |
7.0 (Surface & Middle) |
17.2 |
|
|
81.7 (Bottom) |
6.2 (Bottom) |
|||||
|
DB1 |
Avg. |
7.9 |
8.2 |
99.6 (Surface & Middle) |
7.1 (Surface & Middle) |
23.0 |
|
81.0 (Bottom) |
5.9 (Bottom) |
|||||
|
Min. |
7.4 |
2.7 |
81.0 (Surface & Middle) |
5.9 (Surface & Middle) |
3.4 |
|
|
81.0 (Bottom) |
5.9 (Bottom) |
|||||
|
Max |
8.4 |
14.0 |
143.2 (Surface & Middle) |
10.0 (Surface & Middle) |
52.9 |
|
|
81.0 (Bottom) |
5.9 (Bottom) |
|||||
|
E24A |
Avg. |
7.9 |
7.0 |
92.4 |
6.6 |
32.4 |
|
Min. |
7.5 |
1.9 |
36.5 |
2.7 |
7.7 |
|
|
Max |
8.3 |
12.9 |
135.1 |
9.5 |
69.1 |
|
|
E25 |
Avg. |
7.5 |
1.8 |
55.9 |
4.1 |
40.3 |
|
Min. |
7.1 |
0.6 |
22.9 |
1.7 |
20.0 |
|
|
Max |
7.9 |
3.9 |
88.8 |
6.6 |
75.1 |
|
|
E26 |
Avg. |
7.5 |
1.3 |
56.0 (Surface & Middle) |
4.1 (Surface & Middle) |
56.6 |
|
50.1 (Bottom) |
3.7 (Bottom) |
|||||
|
Min. |
7.1 |
0.5 |
16.6 (Surface & Middle) |
1.2 (Surface & Middle) |
23.6 |
|
|
15.7 (Bottom) |
1.2 (Bottom) |
|||||
|
Max |
8.0 |
2.9 |
109.4 (Surface & Middle) |
7.8 (Surface & Middle) |
118.7 |
|
|
97.9 (Bottom) |
7.2 (Bottom) |
|||||
|
E27A |
Avg. |
7.7 |
2.7 |
74.0 (Surface & Middle) |
5.4 (Surface & Middle) |
51.7 |
|
83.8 (Bottom) |
6.1 (Bottom) |
|||||
|
Min. |
7.2 |
1.0 |
40.1 (Surface & Middle) |
2.9 (Surface & Middle) |
15.7 |
|
|
83.8 (Bottom) |
6.1 (Bottom) |
|||||
|
Max |
8.1 |
5.0 |
110.9 (Surface & Middle) |
8.1 (Surface & Middle) |
87.7 |
|
|
83.8 (Bottom) |
6.1 (Bottom) |
|||||
|
E28A |
Avg. |
7.4 |
1.2 |
43.7 |
3.2 |
63.4 |
|
Min. |
7.0 |
0.4 |
16.0 |
1.2 |
30.3 |
|
|
Max. |
7.8 |
2.3 |
84.4 |
6.2 |
121.9 |
|
|
KT1 |
Avg. |
7.4 |
1.1 |
42.4 |
3.1 |
64.2 |
|
Min. |
7.1 |
0.3 |
14.7 |
1.1 |
31.1 |
|
|
Max |
7.8 |
2.5 |
79.0 |
5.9 |
163.9 |
|
|
SP1 |
Avg. |
7.4 |
1.1 |
41.5 |
3.1 |
61.9 |
|
Min. |
7.0 |
0.2 |
13.6 |
1.0 |
30.9 |
|
|
Max |
7.8 |
2.2 |
83.9 |
6.2 |
89.5 |
|
Table 3‑9 Summary of Baseline Marine Water Quality Monitoring Results for Laboratory Analysis (Mid-Ebb)
|
Monitoring Station ID |
SS (mg/L) |
NH3-N (mg/L) |
NO2-N (mg/L) |
TIN (mg/L) |
TKN (mg/L) |
TP (mg/L) |
NO3-N (mg/L) |
TN (mg/L) |
BOD5 (mg/L) |
E.coli (CFU/100mL) |
|
|
W1 |
Avg. |
5 |
<0.01 |
0.05 |
1.43 |
0.3 |
0.04 |
1.38 |
1.7 |
<2 |
360 |
|
Min. |
2 |
<0.01 |
0.02 |
0.74 |
0.1 |
0.01 |
0.68 |
1.0 |
<2 |
1 |
|
|
Max |
11 |
<0.01 |
0.11 |
1.68 |
0.6 |
0.06 |
1.65 |
2.2 |
<2 |
5300 |
|
|
W2 |
Avg. |
5 |
<0.01 |
0.05 |
1.42 |
0.2 |
0.04 |
1.37 |
1.7 |
<2 |
322 |
|
Min. |
2 |
<0.01 |
0.03 |
0.75 |
<0.1 |
0.01 |
0.68 |
1.0 |
<2 |
1 |
|
|
Max |
10 |
0.02 |
0.10 |
1.70 |
0.5 |
0.06 |
1.66 |
2.1 |
<2 |
5700 |
|
|
W3 |
Avg. |
5 |
<0.01 |
0.05 |
1.40 |
0.3 |
0.04 |
1.34 |
1.6 |
<2 |
203 |
|
Min. |
2 |
<0.01 |
0.02 |
0.75 |
<0.1 |
0.01 |
0.65 |
1.0 |
<2 |
1 |
|
|
Max |
10 |
0.13 |
0.09 |
1.73 |
1.4 |
0.06 |
1.65 |
2.9 |
<2 |
4700 |
|
|
W4 |
Avg. |
6 |
<0.01 |
0.05 |
1.39 |
0.3 |
0.04 |
1.34 |
1.6 |
<2 |
336 |
|
Min. |
2 |
<0.01 |
0.02 |
0.73 |
<0.1 |
0.01 |
0.68 |
1.0 |
<2 |
1 |
|
|
Max |
16 |
0.01 |
0.10 |
1.70 |
0.5 |
0.07 |
1.66 |
2.0 |
3 |
4900 |
|
|
W5 |
Avg. |
5 |
<0.01 |
0.05 |
1.43 |
0.2 |
0.04 |
1.38 |
1.7 |
<2 |
366 |
|
Min. |
2 |
<0.01 |
0.03 |
0.73 |
<0.1 |
0.01 |
0.68 |
0.9 |
<2 |
1 |
|
|
Max |
18 |
0.03 |
0.08 |
1.70 |
0.4 |
0.06 |
1.67 |
2.0 |
<2 |
5000 |
|
|
W6 |
Avg. |
6 |
<0.01 |
0.05 |
1.40 |
0.2 |
0.04 |
1.35 |
1.6 |
<2 |
268 |
|
Min. |
2 |
<0.01 |
0.02 |
0.75 |
0.1 |
0.01 |
0.65 |
1.0 |
<2 |
1 |
|
|
Max |
18 |
0.03 |
0.10 |
1.68 |
0.6 |
0.06 |
1.66 |
2.1 |
3 |
4400 |
|
|
W7 |
Avg. |
7 |
<0.01 |
0.05 |
1.38 |
0.3 |
0.05 |
1.33 |
1.6 |
<2 |
277 |
|
Min. |
2 |
<0.01 |
0.02 |
0.77 |
0.1 |
0.01 |
0.66 |
1.0 |
<2 |
1 |
|
|
Max |
25 |
0.04 |
0.09 |
1.71 |
0.7 |
0.08 |
1.68 |
2.2 |
3 |
3800 |
|
|
W8 |
Avg. |
7 |
<0.01 |
0.05 |
1.41 |
0.3 |
0.04 |
1.36 |
1.7 |
<2 |
217 |
|
Min. |
2 |
<0.01 |
0.02 |
0.73 |
0.1 |
0.01 |
0.67 |
1.0 |
<2 |
1 |
|
|
Max |
18 |
0.02 |
0.10 |
1.76 |
0.6 |
0.07 |
1.72 |
2.2 |
3 |
4700 |
|
|
DB1 |
Avg. |
24 |
1.81 |
0.11 |
1.76 |
1.2 |
0.27 |
1.05 |
2.3 |
4 |
2916 |
|
Min. |
3 |
<0.01 |
0.01 |
0.59 |
0.1 |
0.04 |
0.52 |
1.0 |
<2 |
<1 |
|
|
Max |
77 |
3.76 |
0.23 |
4.46 |
5.4 |
0.78 |
1.64 |
6.1 |
6 |
29000 |
|
|
E24A |
Avg. |
25 |
1.75 |
0.12 |
1.74 |
1.1 |
0.27 |
1.04 |
2.3 |
<2 |
1252 |
|
Min. |
3 |
<0.01 |
0.02 |
0.59 |
0.2 |
0.06 |
0.51 |
1.0 |
<2 |
2 |
|
|
Max |
102 |
3.70 |
0.23 |
4.41 |
5.4 |
0.77 |
1.61 |
6.1 |
4 |
7300 |
|
|
E25 |
Avg. |
51 |
2.3 |
0.19 |
3.48 |
3.1 |
0.64 |
1.07 |
4.2 |
4 |
9188 |
|
Min. |
9 |
<0.01 |
0.15 |
1.59 |
0.9 |
0.36 |
0.36 |
2.3 |
<2 |
97 |
|
|
Max |
88 |
4.60 |
0.24 |
5.13 |
5.5 |
1.19 |
1.75 |
6.2 |
7 |
40000 |
|
|
E26 |
Avg. |
52 |
2.52 |
0.18 |
3.55 |
3.2 |
0.65 |
1.06 |
4.3 |
4 |
12298 |
|
Min. |
9 |
<0.01 |
0.14 |
1.55 |
0.9 |
0.36 |
0.35 |
1.8 |
<2 |
38 |
|
|
Max |
98 |
4.87 |
0.25 |
5.41 |
5.8 |
1.22 |
1.73 |
6.3 |
7 |
53000 |
|
|
E27A |
Avg. |
53 |
2.23 |
0.19 |
3.49 |
3.1 |
0.64 |
1.08 |
4.2 |
4 |
7637 |
|
Min. |
11 |
0.02 |
0.14 |
1.58 |
0.9 |
0.35 |
0.35 |
2.3 |
<2 |
87 |
|
|
Max |
91 |
4.50 |
0.24 |
5.05 |
5.4 |
1.21 |
1.76 |
6.2 |
8 |
25000 |
|
|
E28A |
Avg. |
58 |
2.14 |
0.18 |
3.39 |
3.0 |
0.63 |
1.07 |
4.1 |
4 |
12280 |
|
Min. |
40 |
0.05 |
0.15 |
1.63 |
0.4 |
0.33 |
036 |
1.9 |
<2 |
620 |
|
|
Max |
103 |
4.78 |
0.21 |
5.31 |
5.4 |
1.24 |
1.74 |
6.1 |
7 |
49000 |
|
|
KT1 |
Avg. |
59 |
2.41 |
0.18 |
3.56 |
3.4 |
0.63 |
1.07 |
4.4 |
4 |
10652 |
|
Min. |
36 |
<0.01 |
0.15 |
1.58 |
0.9 |
0.34 |
0.36 |
1.9 |
<2 |
65 |
|
|
Max |
120 |
4.72 |
0.23 |
5.27 |
5.7 |
1.24 |
1.72 |
6.2 |
7 |
46000 |
|
|
SP1 |
Avg. |
60 |
2.10 |
0.18 |
3.34 |
2.9 |
0.62 |
1.06 |
4.2 |
4 |
11260 |
|
Min. |
41 |
0.04 |
0.15 |
1.52 |
0.4 |
0.34 |
0.34 |
1.9 |
<2 |
510 |
|
|
Max |
121 |
4.65 |
0.20 |
5.16 |
5.5 |
1.09 |
1.76 |
6.2 |
7 |
42000 |
|
Table 3‑10 Summary of Baseline Marine Water Quality Monitoring Results for Laboratory Analysis (Mid-Flood)
|
Monitoring Station ID |
SS (mg/L) |
NH3-N (mg/L) |
NO2-N (mg/L) |
TIN (mg/L) |
TKN (mg/L) |
TP (mg/L) |
NO3-N (mg/L) |
TN (mg/L) |
BOD5 (mg/L) |
E.coli (CFU/100mL) |
|
|
W1 |
Avg. |
4 |
<0.01 |
0.05 |
1.37 |
0.3 |
0.04 |
1.32 |
1.6 |
<2 |
307 |
|
Min. |
<2 |
<0.01 |
0.01 |
0.73 |
<0.1 |
0.01 |
0.66 |
1.0 |
<2 |
<1 |
|
|
Max |
11 |
0.02 |
0.09 |
1.80 |
0.7 |
0.06 |
1.75 |
2.1 |
<2 |
4300 |
|
|
W2 |
Avg. |
4 |
<0.01 |
0.05 |
1.36 |
0.3 |
0.04 |
1.31 |
1.6 |
<2 |
226 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.72 |
<0.1 |
0.01 |
0.66 |
1.0 |
<2 |
<1 |
|
|
Max |
10 |
0.01 |
0.11 |
0.78 |
0.6 |
0.16 |
1.74 |
2.1 |
<2 |
2600 |
|
|
W3 |
Avg. |
5 |
<0.01 |
0.05 |
1.41 |
0.2 |
0.05 |
1.36 |
1.6 |
<2 |
135 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.68 |
<0.1 |
<0.01 |
0.61 |
0.9 |
<2 |
<1 |
|
|
Max |
15 |
<0.01 |
0.11 |
1.78 |
0.4 |
0.17 |
1.73 |
2.0 |
3 |
2500 |
|
|
W4 |
Avg. |
4 |
<0.01 |
0.05 |
1.38 |
0.2 |
0.06 |
1.33 |
1.6 |
<2 |
275 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.73 |
<0.1 |
<0.01 |
0.66 |
1.0 |
<2 |
<1 |
|
|
Max |
10 |
<0.01 |
0.10 |
1.78 |
0.5 |
0.34 |
1.73 |
2.1 |
<2 |
5200 |
|
|
W5 |
Avg. |
4 |
<0.01 |
0.05 |
1.38 |
0.3 |
0.04 |
1.32 |
1.6 |
<2 |
334 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.77 |
<0.1 |
<0.01 |
0.68 |
1.0 |
<2 |
<1 |
|
|
Max |
9 |
0.03 |
0.10 |
1.74 |
0.5 |
0.06 |
1.70 |
2.0 |
3 |
2700 |
|
|
W6 |
Avg. |
6 |
<0.01 |
0.05 |
1.41 |
0.2 |
0.05 |
1.36 |
1.6 |
<2 |
248 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.62 |
0.1 |
<0.01 |
0.57 |
0.9 |
<2 |
<1 |
|
|
Max |
14 |
<0.01 |
0.12 |
1.79 |
0.4 |
0.17 |
1.75 |
2.0 |
<2 |
4000 |
|
|
W7 |
Avg. |
5 |
<0.01 |
0.05 |
1.42 |
0.2 |
0.05 |
1.37 |
1.7 |
<2 |
274 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.73 |
0.1 |
<0.01 |
0.67 |
1.0 |
<2 |
<1 |
|
|
Max |
10 |
0.02 |
0.11 |
1.69 |
0.6 |
0.17 |
1.66 |
2.2 |
<2 |
4600 |
|
|
W8 |
Avg. |
5 |
<0.01 |
0.05 |
1.41 |
0.2 |
0.07 |
1.36 |
1.6 |
<2 |
419 |
|
Min. |
<2 |
<0.01 |
0.02 |
0.73 |
0.1 |
<0.01 |
0.67 |
1.0 |
<2 |
<1 |
|
|
Max |
11 |
<0.01 |
0.11 |
0.70 |
0.4 |
0.43 |
1.67 |
2.0 |
<2 |
5100 |
|
|
DB1 |
Avg. |
44 |
1.88 |
0.12 |
1.79 |
1.3 |
0.31 |
1.09 |
2.5 |
4 |
4792 |
|
Min. |
3 |
<0.01 |
0.01 |
0.58 |
0.2 |
0.05 |
0.51 |
1.0 |
<2 |
<1 |
|
|
Max |
160 |
3.77 |
0.24 |
4.47 |
5.5 |
0.90 |
1.92 |
6.2 |
6 |
4500 |
|
|
E24A |
Avg. |
33 |
1.91 |
0.12 |
1.84 |
1.3 |
0.31 |
1.09 |
2.5 |
4 |
3750 |
|
Min. |
2 |
<0.01 |
0.01 |
0.58 |
0.2 |
0.04 |
0.50 |
1.0 |
<2 |
<1 |
|
|
Max |
112 |
4.03 |
0.26 |
4.73 |
5.5 |
0.91 |
1.92 |
6.2 |
6 |
32000 |
|
|
E25 |
Avg. |
58 |
2.71 |
0.19 |
3.54 |
3.2 |
0.65 |
1.09 |
4.4 |
4 |
9906 |
|
Min. |
37 |
<0.01 |
0.15 |
1.31 |
0.5 |
0.34 |
0.38 |
1.9 |
3 |
370 |
|
|
Max |
116 |
5.05 |
0.25 |
5.60 |
5.1 |
1.20 |
1.91 |
5.8 |
7 |
37000 |
|
|
E26 |
Avg. |
62 |
2.50 |
0.19 |
3.51 |
3.2 |
0.66 |
1.08 |
4.4 |
4 |
10062 |
|
Min. |
35 |
<0.01 |
0.14 |
1.45 |
1.0 |
0.38 |
0.36 |
2.3 |
3 |
120 |
|
|
Max |
161 |
4.90 |
0.24 |
5.45 |
5.3 |
1.20 |
1.88 |
6.0 |
7 |
45000 |
|
|
E27A |
Avg. |
53 |
2.47 |
0.19 |
3.36 |
2.6 |
0.62 |
1.08 |
3.9 |
4 |
8402 |
|
Min. |
3 |
<0.01 |
0.15 |
1.26 |
0.5 |
0.30 |
0.35 |
1.4 |
2 |
16 |
|
|
Max |
103 |
4.92 |
0.24 |
5.50 |
5.3 |
1.20 |
1.91 |
6.0 |
7 |
36000 |
|
|
E28A |
Avg. |
62 |
2.47 |
0.19 |
3.42 |
3.1 |
0.67 |
1.07 |
4.3 |
4.5 |
12329 |
|
Min. |
32 |
<0.01 |
0.14 |
1.37 |
1.0 |
0.39 |
0.36 |
2.4 |
2.0 |
310 |
|
|
Max |
152 |
5.00 |
0.24 |
5.53 |
5.1 |
1.20 |
1.90 |
5.6 |
7.0 |
47000 |
|
|
KT1 |
Avg. |
68 |
2.37 |
0.19 |
3.43 |
3.3 |
0.66 |
1.08 |
4.4 |
4 |
10093 |
|
Min. |
35 |
<0.01 |
0.14 |
1.55 |
1.0 |
0.38 |
0.35 |
2.5 |
3 |
200 |
|
|
Max |
176 |
4.73 |
0.25 |
5.24 |
5.1 |
1.12 |
1.86 |
5.8 |
7 |
44000 |
|
|
SP1 |
Avg. |
53 |
2.59 |
0.18 |
3.40 |
3.2 |
0.67 |
1.06 |
4.4 |
4 |
13775 |
|
Min. |
34 |
<0.01 |
0.15 |
1.33 |
1.0 |
0.34 |
0.35 |
2.1 |
2 |
800 |
|
|
Max |
92 |
4.80 |
0.23 |
5.33 |
5.9 |
1.32 |
1.84 |
6.4 |
6 |
43000 |
|
3.7.1 Construction phase water quality monitoring is evaluated against Action and Limit Levels. The Action and Limit Levels (A/L levels) were set in accordance with the derivation criteria specified in the EM&A Manual as shown in Table 3-11. Based on the baseline water quality monitoring data collected between 24 June 2024 and 20 July 2024, the derived A/L levels for impact monitoring station during construction stage are presented in Table 3-12.
Table 3‑11 Derivation of Action and Limit Levels for Water Quality
|
Parameters |
Action Level |
Limit Level |
|
DO in mg/L (Surface, Middle & Bottom)2 (1m below surface)4 |
Surface & Middle 5%-ile of baseline data for surface and middle layer |
Surface & Middle 4 mg/L or 1%-ile of baseline data for surface and middle layer |
|
Bottom 5%-ile of baseline data for bottom layer |
Bottom 2 mg/L or 1%-ile of baseline data for bottom layer |
|
|
Mariculture Subzone of Deep Bay WCZ 5.1 mg/L or level at control station (whichever is lower) |
Mariculture Subzone of Deep Bay WCZ 5 mg/L or level at control station (whichever is lower) |
|
|
Suspended Solids in mg/L (depth-average 1)3 |
95 percentile of baseline data or 120% of upstream control station at the same tide of the same day |
99 percentile of baseline data or 130% of upstream control station at the same tide of the same day |
|
Turbidity in NTU (depth-average 1)3 |
95 percentile of baseline data or 120% of upstream control station at the same tide of the same day |
99 percentile of baseline data or 130% upstream control station at the same tide of the same day |
Remarks:
1. “Depth-averaged” is calculated by taking the arithmetic means of reading of all sampling depths.
2. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.
3. For SS and turbidity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.
4. For DO measurement in the Mariculture Subzone of the Deep Bay WCZ, samples should be taken 1m below surface.
Table 3‑12 Derived Action and Limit Levels for Water Quality during Construction Phase
|
Parameter |
Station M1 |
|
|
Action Level |
Limit Level |
|
|
DO in mg/L |
3.8 |
3.7 |
|
Turbidity in NTU |
17.2 OR 120% of upstream control station(s) at the same tide of the same day, whichever is higher |
17.7 OR 130% of upstream control station(s) at the same tide of the same day, whichever is higher |
|
SS in mg/L |
25 OR 120% of upstream control station(s) at the same tide of the same day, whichever is higher |
26 OR 130% of upstream control station(s) at the same tide of the same day, whichever is higher |
4.1.1 Baseline air quality monitoring was carried out between 24 June 2024 and 7 July 2024 at the 3 designated monitoring stations. During the baseline monitoring period, no major sources of TSP was observed near the designated monitoring stations.
4.1.2 The air quality monitoring results of 1-hr TSP were below the Limit Level set out in the EM&A Manual at all monitoring locations. The air quality A/L Levels at each location were derived from the baseline monitoring results and the derived A/L Levels will be used for the subsequent impact monitoring during construction stage.
4.1.3 The baseline water quality monitoring was conducted between 24 June 2024 and 20 July 2024 at 18 designated monitoring stations.
4.1.4 The Action and Limit Levels of the water quality monitoring at the designated impact station (i.e. M1) were derived from the baseline monitoring results and the derived A/L Levels will be used for the subsequent impact monitoring during construction stages.
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