1. Environmental Noise Impact Assessment Brett Williams

2. Scope The measurement of the existing ambient noise (day and night time). A noise study of the future impact during construction and operation of the proposed desalination plant, taking into consideration sensitive receptors.

3. Methodology SANS 10103:2008 Version 6 - The measurement and rating of environmental noise with respect to annoyance and to speech communication. SANS 10328, Methods for environmental noise impact assessments. SANS 10357, The calculation of sound propagation by the Concawe method.

4. Sensitive Receptors Guano Site at Saltworks Shoreline immediately adjacent to plant Residents of Swakopmund Local fauna around plant

5. Guano Site Saltworks Swakopmund

6. Noise Sources - Construction Site remediation and earthworks. Building construction using mobile equipment, cranes, concrete mixing and pile driving equipment. Vehicle use and movement. Temporary jetty construction. Activities will include pile driving, drilling and blasting. Construction of the power line

7. Examples of Equipment Noise Levels TypeDescription Typical Sound Power Level (dB) Bus60 seater95 Passenger Vehicle Passenger vehicle or light delivery vehicle such as bakkies 85 Trucks10 ton capacity95 Cranes Overhead and mobile 109 Mobile Construction Vehicles Front end loaders100

8. Noise Sources - Operation Vehicles High pressure pumps and motors Energy recovery systems and turbines Compressors

9. Examples of Operation Noise Levels TypeDescription Typical Sound Power Level (dB) Passenger Vehicle Passenger vehicle or light delivery vehicle such as bakkies 85 Trucks 10 ton capacity95 Trucks 10 ton capacity95 Pumps High pressure pumps, motors and energy recovery turbines 96 Pumps Backwash92 Compressors Air compressors100

10. Location Start Time Wind Temp ( o Celsius) L Req.T dB(A) Comments Site 106:40Calm1847.88/8 th cloud cover Site 207:10Calm1846.2 Light rain for 5 minutes Site 307:45Calm1860.4 8 cars and 6 trucks passed the test site Site 114:30SSW2145.7 Site 214:55SSW2146.42/8 th cloud cover Site 315:20SSW2154.4 5 cars and 3 trucks passed the test site Site 121:50NNE2042.28/8 th cloud cover Site 222:15NNE2041.7 Site 322:35NNE2041.7No cars

11. Start Time Wind Temp ( o Celsius) L Req.T dB(A) Comments 16:05SSW2167.9 CAT 320D Excavator measured at approximately 50 m. 16:20SSW2169.6 Mobile crane on jetty measured at approximately 70 m 16:35SSW2172.6 Drilling rig / Pile Driver on jetty measured at approximately 70 m

12. Sound Power Levels used for Modelling Hertz63125250500100020004000 Sound Power 91908789878579

21. Description Typical Sound Power Level (dB) Overhead and mobile109 Front end loaders100 Excavators108 Bull Dozer111 Piling machine (mobile)115 Total117.7 Combining Different Construction Noise Sources

22. Distance from noise source (metres) Noise level dB(A) 1077 2071 4065 8059 16053 32047 64041 128035 Attenuation by Distance of 117 dB source

23. Conclusion The Southern and Northern Options will likely impact on the sensitive fauna at the coast line directly opposite the site if a NNE wind is blowing. The ambient noise levels during the night will be exceeded. The impact will however be dependent on the sea state, as any vigorous wave action will result in a higher ambient directly at the shoreline.

24. Conclusion It is not envisaged that there will be any impact on the guano site or the adjacent shoreline area during a SSW or a NNE wind during construction or operation as the sound level will be well below the ambient level at this point.

25. Conclusion There will be an impact on the immediate surrounding environment from the construction activities, especially the pile driving. The area surrounding the temporary jetty will be affected for approximately 320m in all directions.

26. Conclusion There will be no noise impact on the residents of Swakopmund. The increased vehicular traffic will have a minimal effect as the site is very close to the C34 and vehicles will travel away from the sensitive coastal areas. Blasting activities will most likely have an effect on the fauna in the immediate vicinity of the blast area. The operational noise will impact on the recreational fisherman during NNE winds.