Section 3.10: Site Plans and Technical Data - Rick Neufeld Comments

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Northern Gateway Pipelines Inc. Section 3.10: Site Plans and Technical Data Table of Contents 3.5 Ice Data The waters of Douglas Channel are not subjected to freezing and remain open all year round. As such there are no ice load effects on the terminal structures other than the potential build-up of ice and snow on the deck and topside equipment due to freezing sea spray and snow fall. 3.6 Temperature Data 3.6.1 Atmospheric Temperature The closest temperature monitoring station is Kitimat 2 located near Kitimat Harbour approximately 10km to the north of the project site. The average daily air temperatures recorded at this station from 1966 to 2002 are as follows (Reference 11): • Recorded Extreme Maximum Temperature (August): 36.7 deg. C • July Daily Maximum Temperature: 21.5 deg. C • July Daily Average Temperature: 16.7 deg. C • January Daily Average Temperature: -2.4 deg. C • January Daily Minimum Temperature: -4.8 deg. C • Recorded Extreme Minimum Temperature (December): -26.0 deg. C 3.6.2 Water Temperature Surface temperature records near the project site are available from the Nanakwa Shoal Marine Buoy. These temperatures are measured in the “upper layer” of the water column. The records indicate the following annual (seasonal) water temperature variances (Reference 12): • Extreme Monthly Maximum (July): 22.3 deg. C • Maximum Monthly Average (August): 16.1 deg. C • Minimum Monthly Average (January): 5.2 deg. C • Extreme Monthly Minimum (February): -0.4 deg. C The vertical temperature profile in the water column directly corresponds with the vertical salinity distribution and occurs in three distinct layers in the vicinity of the project site: • A shallow upper layer approximately 3 metres to 7 metres deep characterized by low salinity due to freshwater discharges from the local mountain streams and rivers. It is also characterized by pronounced seasonal changes in salinity and temperature as given above; • A halocline or intermediate layer just below the upper layer approximately 40 to 90 metres deep characterized by a gradual increase in salinity and density. This layer has only small seasonal temperature changes with temperatures varying between 6 to 8 deg. C year round; and, Page 3-8 FINAL - Rev. 0 January 20, 2010
Northern Gateway Pipelines Inc. Section 3.10: Site Plans and Technical Data Table of Contents • A lower layer making up the balance of the water column where year round temperatures are fairly consistent at 7 deg. C or slightly lower. In certain years temperature minimums are observed where the temperatures are less than 6 deg. C. Recent water temperature surveys conducted between Sept. 2005 and Jan. 2006 (Reference 8) and between Jan. 2006 and April 2006 (Reference 9) are consistent with the historical data. Unfortunately, due to the lack of long-term temperature records, it is difficult to determine any longer term variations. However, considering there is a general correspondence between water temperature and atmospheric temperature, the historical atmospheric temperature trends in the area suggest the historical water temperature variations are relatively small. January 20, 2010 FINAL - Rev. 0 Page 3-9
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Section 3.10: Site Plans and Technical Data - Rick Neufeld Comments

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