4.2.2 Sound level meters and calibrators shall comply with the International Electrotechnical Commission (IEC) Publication 651:1979 (Type 1) and 804:1985 (Type 1) specification as referred to in the Technical Memorandum (TM) issued under the Noise Control Ordinance. The sound level meters shall be supplied and used with the manufacturer recommended weather shield as appropriate.

4.2.3 Sound level meters shall be calibrated using a portable calibrator prior to and following each noise measurement. The calibration levels shall be noted with the measurement results and where the difference between the calibration levels is greater than 1.0 dB(A), the measurement shall be repeated. Calibrated hand-held anemometers shall also be supplied for the measurement of wind speeds during noise monitoring periods.

4.2.4 The equipment shall be kept in a good state of repair in accordance with the manufacturer’s recommendations and maintained in proper working order with sufficient spare equipment available in the event of breakdown to maintain the planned monitoring programme.

4.2.5 Noise measurements will not be made in the presence of fog, rain, wind with a steady speed exceeding 5m/s or wind with gusts exceeding 10m/s. The wind speed shall be checked with the hand-held anemometers capable of measuring the wind speed in m/s.

4.2.6 The ET is responsible for provision of the monitoring equipment. He shall ensure that sufficient noise measuring equipment and associated instrumentation are available for carrying out the baseline monitoring, regular impact monitoring and ad hoc monitoring. All the equipment and associated instrumentation shall be clearly labelled.

4.3 Noise Monitoring Methodology

4.3.1 Weatherproof logging sound level meters shall be installed at the monitoring locations during baseline monitoring. Continuous baseline noise for the A-weighted levels L_eq, L₁₀ and L₉₀ shall be measured over a two week period, and sampling period of 5 minutes will be used throughout the monitoring. Average, by sound power, of six consecutive L_{eq (5 min)} reading is used to provide L_{eq (30 min)} for the non-restricted period and three consecutive L_{eq (5 min)} reading is used to provide L_{eq (15 min)} for the restricted period during the impact stage.

4.3.2 Regular visits, for a period of at least once every three to four days, shall be conducted by the ET to ensure the continuous operations of the sound level meter. Impact monitoring shall be conducted once a week. Information such as date of monitoring, weather condition, equipment used, measurement results and major noise sources will be recorded on the data record sheet. Examples of the record sheets are presented in Appendix 2.

4.4 Noise Monitoring Locations

4.4.1 Thirteen monitoring location as presented in Table 4.4.1 have been identified for noise monitoring within the Study Area. Their location is shown in Figures 4.6 to 4.9. The status and locations of noise sensitive receivers may change after the approval of the EIA Report. If such cases exist, the ET Leader shall propose updated monitoring locations and seek approval from ER and IEC.

Table 4.4.1 Noise Monitoring Locations

ID No.	Location	Nature of Uses
SSNV_M2	Village house next to a nallah in Tong Tai Po Tsuen (near DD118 1720 S.A)	Residential
SSNV_M3	Village house near a soybean sauce factory in Sung Shan New Village (near DD118 1712)	Residential
SSNV_M6	#43, Sung Shan New Village	Residential
TW_M2	#200, Cheung Po	Residential
TW_M3	Kai Yip Garden, #3H, Tai Wo	Residential
LFT_M1	#2G, Lin Fa Tei	Residential
LFT_M3	#125, Lin Fa Tei	Residential
LFT_M5	#156B, Lin Fa Tei	Residential
LFT_M7	Village house near the nullah (DD112 699 S.E)	Residential
LFT_M13	#290, Lin Fa Tei	Residential
HC_M3	Block F, Fu Hing Garden, #88 Sheung Che	Residential
HC_M4	#1C, Chuk Hang	Residential
HC_M6	The Arbutus House 12, #52, Shui Kan Shek	Residential

4.4.2 When alternative monitoring locations are proposed, the monitoring locations shall be chosen based on the following criteria:

(i) The locations shall be close to the site activities which are likely to have significant noise impacts;

(ii) The locations shall be close to the noise sensitive receivers (NSRs) (NB. For the purpose of this section, any domestic premises, hotel, hostel, temporary housing accommodation, hospital, medical clinic, educational institution, place of public worship, library, court of law, performing art centre shall be considered as NSR);

(iii) Care shall be taken to cause minimal disturbance to the occupants of sensitive receivers; and

(iv) The proposed alternative monitoring locations should be agreed by ER and IEC.

4.4.3 The monitoring location shall normally be at a point 1m from the exterior of the sensitive receivers building façade and 1.2m above the ground. If there is a problem with access to the normal monitoring position, an alternative position may be chosen, and a correction to the measurement made. For reference, a correction of +3dB(A) shall be made to free field measurements. The ET Leader shall agree with the IEC on the monitoring position and the corrections adopted. Once the positions for the monitoring stations are chosen, the baseline and impact monitoring shall be carried out at the same position.

4.5 Baseline Noise Monitoring

4.5.1 To obtain fully satisfactory baseline results, weatherproof logging sound level meter shall be used. Continuous baseline noise for the A-weighted levels L_eq, L₁₀ and L₉₀ shall be measured over a period of two consecutive weeks and sampling period of 5 minutes will be used throughout the monitoring. Average, by sound power, of six consecutive L_{eq (5 min)} reading is used to provide L_{eq (30 min)} for the non-restricted period and three consecutive L_{eq (5 min)} reading is used to provide L_{eq (15 min)} for the restricted period. The monitoring period shall be selected prior to the commencement of any construction activities and so as to avoid other typical noise sources. Measurements shall be recorded to the nearest 0.1 dB. Major noise sources observed, both on-site and off-site, at each location will be recorded. A schedule on the baseline monitoring shall be submitted to the IEC for approval before the monitoring.

4.5.2 In exceptional cases, when insufficient baseline monitoring data or questionable results are obtained, the ET Leader and Contractor shall liaise with the IEC to agree on an appropriate set of data to be used as a baseline reference and submit to the IEC for approval.

4.6 Impact Noise Monitoring

4.6.1 Provided that the construction works will be in small scale, noise monitoring shall be undertaken at each designated monitoring stations when there are construction works nearby (within 100m of the monitoring stations). The following is an initial guide on the regular monitoring frequency for each station on a per week basis when construction activities are undertaken:

(i) one set of L_{eq (30 min)} noise level as six consecutive L_{eq (5 min)} between 07:00-19:00 hours on normal weekdays

4.6.2 Major noise sources observed, both on-site and off-site, at each location shall be recorded.

4.6.3 In the case of non-compliance with the construction noise criteria, more frequent monitoring as specified in the Event and Action Plan in Table 4.4.3 shall be carried out. This additional monitoring shall be continued until the exceedance is rectified or proved to be from a source other than the construction activities.

4.7 Event and Action Plan

4.7.1 The Action and Limit levels for construction noise are shown in Table 4.4.2. All NSRs identified in the Project are classified with an Area Sensitivity Rating (ASR) A in accordance with the Technical Memorandum on Noise from Construction Work Other Than Percussive Piling. Should non-compliance of the noise criteria occurs, action in accordance with the Event / Action Plans in Table 4.4.3 shall be carried out.

Table 4.4.2 Action and Limit Levels for Construction Noise

Time Period	Action	Limit
07:00-19:00 hours on normal weekdays;	When one or more documented complaints are received	75dB(A)*
07:00-23:00 hours on holidays; and 19:00-23:00 hours on all other days		45⁽¹⁾ dB(A)
23:00-07:00 hours of the next day		30⁽¹⁾ dB(A)

Note: • Between 07:00-19:00 hours, construction noise limit for school during normal term time is 70dB(A) and 65dB(A) during examination period.

ASR = “A” which is a rural area that are not affected by the IF.

(1) - As stipulated In the Technical Memorandum on Noise from Construction Work in Designated Areas.

Table 4.4.3 Event / Action Plan for Construction Noise

Event	ET	IEC	ER	CONTRACTOR
Action Level	1. Notify ER, IEC and Contractor; 2. Carry out investigation; 3. Report the results of investigation to the IEC, ER and Contractor; 4. Discuss with the IEC and contractor and formulate remedial measures; and 5. Increase monitoring frequency to check the effectiveness of mitigation measures.	1. Review the investigation results submitted by the ET; 2. Review the proposed remedial measures by the Contractor and advise the ER accordingly; and 3. Advise the ER on the effectiveness of the proposed remedial measures.	1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. In consolidation with the IEC, agree with the Contractor on the remedial measures to be implemented; and 4. Supervise the implementation of remedial measures.	1. Submit noise mitigation proposals to IEC and ER; and 2. Implement noise mitigation proposals.
Limit Level	1. Notify IEC, ER, EPD & Contractor; 2. Identify source and investigate the cause of exceedance; 3. Repeat measurement to confirm findings; 4. Increase monitoring frequency; 5. Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented; 6. Discuss with the IEC, Contractor and ER on remedial measures required; 7. Assess the effectiveness of Contractor’s remedial actions and keep IEC, EPD and ER informed of the results; and 8. If exceedance stops, cease additional monitoring.	1. Discuss amongst ER, ER and Contractor on the potential remedial actions; and 2. Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly.	1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. In consolidation with the EIC, agree with the Contractor on the remedial measures to be implemented; 4. Supervise the implementation of remedial measures; and 5. If exceedance continues, consider stopping the Contractor to continue working on that portion of work which causes the exceedance until the exceedance is abated.	1. Take immediate action to avoid further exceedance; 2. Submit proposals for remedial actions to IEC and ER within 3 working days of notification; 3. Implement the agreed proposals; 4. Submit further proposal if problem still not under control; and 5. Stop the relevant portion of works as determined by ER, until the exceedance is abated.

Event

IEC

CONTRACTOR

Action Level

1. Notify ER, IEC and Contractor;

2. Carry out investigation;

3. Report the results of investigation to the IEC, ER and Contractor;

4. Discuss with the IEC and contractor and formulate remedial measures; and

5. Increase monitoring frequency to check the effectiveness of mitigation measures.

1. Review the investigation results submitted by the ET;

2. Review the proposed remedial measures by the Contractor and advise the ER accordingly; and

3. Advise the ER on the effectiveness of the proposed remedial measures.

1. Confirm receipt of notification of failure in writing;

2. Notify Contractor;

3. In consolidation with the IEC, agree with the Contractor on the remedial measures to be implemented; and

4. Supervise the implementation of remedial measures.

1. Submit noise mitigation proposals to IEC and ER; and

2. Implement noise mitigation proposals.

Limit Level

1. Notify IEC, ER, EPD & Contractor;

2. Identify source and investigate the cause of exceedance;

3. Repeat measurement to confirm findings;

4. Increase monitoring frequency;

5. Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented;

6. Discuss with the IEC, Contractor and ER on remedial measures required;

7. Assess the effectiveness of Contractor’s remedial actions and keep IEC, EPD and ER informed of the results; and

8. If exceedance stops, cease additional monitoring.

1. Discuss amongst ER, ER and Contractor on the potential remedial actions; and

2. Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly.

1. Confirm receipt of notification of failure in writing;

2. Notify Contractor;

3. In consolidation with the EIC, agree with the Contractor on the remedial measures to be implemented;

4. Supervise the implementation of remedial measures; and

5. If exceedance continues, consider stopping the Contractor to continue working on that portion of work which causes the exceedance until the exceedance is abated.

1. Take immediate action to avoid further exceedance;

2. Submit proposals for remedial actions to IEC and ER within 3 working days of notification;

3. Implement the agreed proposals;

4. Submit further proposal if problem still not under control; and

5. Stop the relevant portion of works as determined by ER, until the exceedance is abated.

4. noise

4.1 Introduction

4.1.1 In this section, the requirements, methodology, equipment, monitoring locations, criteria and protocols for the monitoring and audit of noise impacts during the construction phase of the Project are presented. The identified noise sensitive receivers are shown in Figures 4.1 to 4.5.

4.2 Monitoring Requirements and Equipment

Noise Parameters

Noise Monitoring Equipment / Calibration