7                    AUDIT RESULTS

7.1              Air Quality

7.1.1        For 1-hour TSP monitoring, a total of 54 sets of measurement were carried out at ASR1, ASR2 and ASR3 during the reporting period and the results of all measurements taken were below the A/L Levels. 

7.1.2        For 24-hour TSP monitoring, a total of 18 sets of measurement were carried out at ASR1, ASR2 and ASR3 during the reporting period and the results of all measurements taken were below the A/L Levels. 

7.2              Noise

7.2.1        A total of 12 sets of Leq(30min) measurement were taken in the daytime (i.e. 0700 to 1900 hours on normal weekdays) at three monitoring stations (NSR1, NSR2 and NSR3) during the reporting period and no exceedances were recorded.

7.2.2        A total of 12 sets of 6 x Leq(5min) measurements were taken in the evening-time (i.e. 1900 to 2300 hours) at all three monitoring stations during the reporting period and no exceedances were recorded.

7.2.3        A total of 12 sets of 4 x Leq(5min) measurements were taken in the night-time (i.e. 2300 to 0700 next day) at all three monitoring stations during the reporting period and no exceedances were recorded.

7.2.4        A total of 9 sets of 6 x Leq(5min) measurements were taken in public holidays (i.e. 0700 to 1900 hours during holidays) at all three monitoring stations and no exceedances were recorded.

7.3              Water Quality

7.3.1        A total of 3 Effluent Discharge Licenses were granted by EPD.  In accordance with the conditions of the licenses, water sampling at designated discharge points shall be carried out on a monthly basis for area P1-SA1 (Part 1) (Grid 1 to 9) and on a quarterly basis for areas P1-SA1 (Part 2) (Grid 10 to 27, Container Port Road E/B), P1-SA6, P1-SA8 and P1-SA11.

7.3.2        Nine water samples were taken for the whole construction site on 27th July 2006 by CHEC.  The water samples were subsequently tested by a HOKLAS accredited laboratory and the results indicated that they have fully complied with the Specific Condition as stipulated in the approved license. In addition, pH and COD were also analyzed and the results also complied with the limits stipulated in the approved licenses.  The next sampling is scheduled for August 2006 for area P1-SA1 (Part 1) (Grid 1 to 9). 

7.4              Waste Management

7.4.1        Waste generated from the Phase 1 Contract included construction and demolition (C&D) materials and chemical waste. CHEC’s handling and disposal of waste has followed the recommended procedures stipulated in the Waste Management Plan (WMP) which was approved by EPD (EPD ref. (45) in EP2/N3/A/28 VII dated 10th September 2002).

7.4.2        A revised WMP (Rev. 17) was submitted to EPD for information on 11th May 2006 with the latest information including the most up to date estimation of inert C&D materials and non-inert C&D materials.

7.4.3        With effect from 6th February 2005, all inert C&D material had been disposed of at Tuen Mun Fill Bank. The trip ticket system has been implemented effectively during the reporting period.

7.4.4        On 7th December 2005, approval was granted by PFC, CEDD to import a maximum of 3,000m3 of soft material from “HY2002/26 – Stonecutters Bridge” for re-usage purposes.  A total of 2,004 m3 of soft material were delivered from HY2002/26 to Phase 1 Contract since December 2005.

7.4.5        Based on the information provided by CHEC with respect to relevant handling records and trip tickets of the Phase 1 Contract, the quantities of materials reused, recycled and disposed of are summarized in Table 7.1.

Table 7.1 Summary of Waste Disposal during the Reporting Period

Material Type

Quantity Produced in the reporting period

Handling Method

 

Handling Quantities in the reporting month

Temporary Storage Locations On-site

(if applicable)

C&D materials

 

(Public Fill)

180 no. of Trucks

 

Tuen Mun Fill Bank

(Tuen Mun Area 38)

1,080m3

 

N/A

(C&D Waste)

N/A

To be recycled (paper)

N/A

P1-SA9

N/A

To be recycled (aluminum can)

N/A

P1-SA9

N/A

To be recycled (plastic bottle)

N/A

P1-SA9

N/A

To be reused

N/A

P1-SA6

N/A

To be returned to supplier

N/A

P1-SA6

114 tones (SENT)

Collected by licensed collector for disposal to SENT and WENT landfills

114 tones

N/A

Chemical waste

N/A

Collected by licensed chemical waste collector

944 litres of spent lube oil

P1-SA6

 

7.5              Site Audits / Inspections

7.5.1        Scheduled site audits were carried out by the ET and IEC on a regular basis in accordance with the EM&A Manual.  Sections below provide a detail summary of the findings identified during these audits and their corresponding implemented corrective and preventive measures.  Photographs of implemented measures are presented in Appendix Q.

Environmental Team Site Inspections

7.5.2        Weekly site inspections were conducted by the ET during the reporting period and the major findings are summarized as follows:

i.              The chemical enhance treatment plant (CETP) at P1-SA6 (STP) was found full of silt.  In addition, silt and standing water was accumulated in the u-channels at areas P1-SA1 (Part 1) and P1-SA6 (Bus depot). 

Corrective and Preventive Actions – The mentioned CETPs and u-channels had been cleared immediately after the site inspections.  In addition, all temporary drainage and runoff control systems have been maintained properly on a weekly basis.  Completed and closed.  (Please refer to Appendix Q, Photo 01 to 04).

ii.            Mosquito larvae were found in stagnant water accumulated on uneven ground of segment storage area at P1-SA1 (Part 1) and within the steelwork at P1-SA6 (Bus Depot, near Sol Data's office). 

Corrective and Preventive Actions - Stagnant water was cleared by CHEC immediately after the site audit.  For P1-SA1 (Part 1), sump pits and water pumps have been deployed to divert stagnant water to treatment facilities prior to discharge.  (Please refer Appendix Q Photo 05 & 06). 

In addition, larvicidal oil / temephos had been applied to places where they were not easily assessable at least twice a week to reduce the risk of mosquito breeding on site. (Please refer Appendix Q Photo 07). The situation will be monitored by RSS and ET continuously.  

iii.          Water pondings were found at areas P1-SA1 (Part 1, along the railway of gantry and near Grid 7 & 8), P1-SA1 (Part 2, near Gird 18), P1-SA6 (near Grid 28 and Sol Data's office).  In addition, standing water was found accumulated within steelworks at areas P1-SA1 (Part 1), P1-SA1 (Part 2 near Kinko's and Well's offices) and P1-SA6 (near Sol Data's office). 

Corrective and Preventive Actions - Leveling of uneven ground and removal of water pondings / stagnant water has been carried out by CHEC wherever possible.  All stagnant water accumulated within steelworks had been removed after the site inspections.  Regular inspection has been carried out by CHEC to ensure proper anti-mosquito measures have been adopted on site.  (Please refer Appendix Q Photo 08 to 12).  The situation will be monitored by RSS and ET continuously.  

iv.          Silty water was observed discharging into storm drains via sedimentation tank no.7 at P1-SA1 (Part 1) and CETP at area P1-SA1 (Part 2, near Grid 11).  The CETP at Grid 11 was found malfunctioned at the time of inspection. 

Corrective and Preventive Actions - For P1-SA1 (Part 1, sedimentation tank no. 7), sandbag barriers had been placed in the u-channels and coagulants have been deployed to enhance the de-silting efficiency.  (Please refer Appendix Q Photo 13).  The mentioned CETP had been repaired and return to normal operation condition.   Completed and closed.  

Independent Environmental Checker (IEC) Site Audit

7.5.3        The monthly IEC audit was carried out on 21st July 2006, 4 observations were recorded and are presented below. 

Observation(s)

i.                A significant amount of silt and grit was accumulated in the chemical enhance treatment plant (CETP) at P1-SA6 (STP).

Corrective and Preventive Actions – All silt and grit had been removed from the CETP after the site audit.  Completed and closed. (Please refer to Appendix Q, Photo 01).

ii.               Silt, grout and cables were found accumulating at the u-channel and ditch next to the CETP at P1-SA6 (STP). 

Corrective and Preventive Actions – The u-channel and ditch had been cleared after the site audit.  In addition, all temporary drainage systems have been maintained properly at least once a weekly.  Completed and closed. (Please refer to Appendix Q, Photo 04).

iii.             Standing water and deposited silt was accumulated in the u-channels at P1-SA6 (Bus Depot). 

Corrective and Preventive Actions – The mentioned u-channels had been cleaned immediately after the site audit. Completed and closed.  (Please refer to Appendix Q, Photo 02).

iv.             Mosquito larvae were found in stagnant water accumulated on uneven ground next to the gantry at P1-SA1 (Part 1). 

Corrective and Preventive Actions – Stagnant water was cleared by CHEC immediately after the site audit.  Sump pits and water pumps have been deployed to divert stagnant water to treatment facilities prior to discharge.  Completed and closed.  (Please refer Appendix Q Photo 05).   In addition, larvicidal oil / temephos had been applied to places where they were not easily assessable at least twice a week to reduce the risk of mosquito breeding on site.  (Please refer Appendix Q Photo 07). The situation will be monitored by ET and RSS continuously.

Environmental Protection Department (EPD) Site Inspections

7.5.4        A joint site inspection was carried out with EPD on 3rd July 2006.  It was noted that appropriate environmental mitigation measures have been implemented by CHEC on site and the performance of such environmental measures was satisfactory.  However, further improvements could be adopted to enhance the current site conditions as advised by the EPD and they are highlighted as follows:

i.           For area P1-SA1 (Part 2), all open stockpiles of dusty material shall be covered entirely by impervious sheeting or sprayed with sufficient water to maintain the entire surface moist. 

Corrective and Preventive Actions – All idle open stockpiles (not in operation) have been covered by impervious sheeting and the remaining stockpile should be covered by impervious sheeting after operation or sprayed with sufficient water to maintain the entire surface moist.  Completed and closed.  (Please refer to Appendix Q, Photo 14 & 15).

ii.          Part of the sandbag barrier along the u-channel adjacent to CT8 at area P1-SA1 (Part 2) was damaged.  CHEC was reminded to replace the damaged sandbags to avoid washout from loose construction materials into existing storm drains. 

Corrective and Preventive Actions – All damaged sandbags had been replaced immediately after the joint site inspection.  In addition, the drainage systems including sandbag barriers have been regularly maintained by CHEC on a weekly basis. Completed and closed. (Please refer to Appendix Q, Photo 16).