PRESENTATION TO MACKENZIE VALLEY LAND AND WATER BOARD 16 May 2017, Yellowknife NWT By Dr. R. A. (Drew) Bodaly
Mercury in lake trout from Nonacho Lake Total mercury in lake trout muscle. Nonacho Lake Raw means; data from Cambria Gordon, AEMP, and Total mercury in lake trout muscle. Nonacho Lake 1.2 Carter family 1 1 Mean mercury concentration in muscle (µg/g 0.9 Total mercury µg/g ww. Median values; data from Ecofish 2016 and 0.8 0.8 Carter family - Values for 1975 to 2013 taken 0.7 from Fig. 4 of Ecofish 2016 0.6 0.6 0.5 w.w.) 0.4 0.4 0.3 0.2 0.2 0.1 0 0 1975 1986 2003 2004 2010 2013 2014 1975 1986 2003 2004 2010 2013 2014
K'aldh& 1s, l>epanmont of Health and SaaaJ. n'lia elm& ""'8a gb4r 111d1-u, ,eden mercury hlllye bey hut, sl, t'anOt'e ts'eldel xadolwOe si, ,ey, ,amlt'e bey<! hu.lj h6u T'a luezain >elk'eto na d i!nela ebMh tadnkh al : 1ellc'etona denela cheth (?et'adyf SO lu shf shuq SJOO hets'ed1 Tl'Qw t'a seku1 Chfheda t6 beyas yeuh'ti helt'li si, 71lagh za k'e M .... t't ICJldal,e begh4ye ts'11Jlaghadhel beghay ts'tn ,,!agh za k'e ,µagh-u tanls ,psaze lu sbf shuq s;ina hets'ed1 t'a cMnediD sl, ?Ji'gh beghay Ls'J d1 begMt Ls'~n si, ,~agh za k'e ,,1agh ,,az lu shf shdt) sana hets'ed, ... Bena dene n.idE' si. 1Jlagh zii k'e n.:i ?~~z lu gha shUly1 S3nti hCts'edJ 7jllgb deneghalchu r'anilt'e = 75g =?J/agh xal ,eta thela r'aoldath l)epartmentoflfeallltandSodlllSen4ces has found that la19e lake trout from Nonacho Lake contain levels of mercury above lheHealth Cinada recommendations for average consumpttan. For,_ traut grute r th an 60 cm In total length: Women who are pn,gnantorbreastreedlng mothers should eat no more than 2 servings of fish per month. ChlldNn ..._, and 11 ,ears age can eat up to 1 ~ 58r(ings per month. 5 pf 'lbung childn,n between one and four,ears of age should eat no more than 1 serving per month. General populatfon should eat no more than 2 servings per week. 1 Serving 75 g 1 pad( of cards :,iliallet11asServices sodaux du GTNO a constate que la c~centrat1on de mercure dans les touladis de grande taille du lac Nonac:ho est ~ aux recommandattons de Sant~ ~nada pour uneconsommatton moyenne. Na consomm ez pas le toul ad l d' une longu eur da plus• eoon : fenvnesenceintes ou qui allaitent ne devraient pas consommer plus de deux portions de potsson par mo,s. Les portion par mois. Lesenfants ~ de clnq a onze ans peuvent consommer 1usqu'a 1 ~ unes enfants ,ages entre un an et quatre an s ne devraient pas consommer plusd'uneponton par mois. Les Je consomme.r plus de deux portions par semalne. Le reste de la population ne devran pa s Une portion correspond a 75 g, S01t la ta1lle d'un paquet de cartes. Bemis xade, Depanment of Health and Socral ServlCm Bets'1 computer ye! beham hvt1 si, 1eycr nfh,: or all others. follow the advice on the Department of Healt and Sacral Services website: Pour les autres sortes de polssons. su1vez les recommandations du site Web du minis1~re de la Sant~ et des Services soclaux .. Sign posted near the shore of Nonacho Lake, 2015
Examples of eroding shorelines on Nonacho Lake Upper photo: M. Carter, 2016 Lower photo: NorthWest Hydraulic Consultants, 2016, Figure 2-2
Water levels - Nonacho Lake – differences after vs before development MV2011L4-0002 Nonacho Lake control dam Tronka Chua Gap
In 1968, the Northern Canada Power Commission completed a rockfill dam at the outlet to this lake on the Taltson River system in conjunction with the Taltson River Hydro Project. The lake became part of the reservoir for the 21 MW Twin Gorges hydroelectric generating station which provided power to Pine Point and now serves Fort Smith, Hay River, Enterprise, and Fort Resolution. Gray (see above) and Hjalmar (see INLAND WATERBODIES--Hjalmar Lake) lakes also became part of the reservoir. Impoundment of the water raised the lake level between 0.3 and 1.8 m above historical levels, with the highest water levels being in the fall and the lowest in early spring following winter draw-down. This is opposite to the natural sequence of water levels and results in summer flooding of the lowlands. There is also spillage of water from the lake overland to Tronka Chua Lake (see INLAND WATERBODIES-- Tronka Chua Lake) when the lake level exceeds an elevation of 344.5 m (1050 feet). (Envirocon Limited et al. 1975)
DFO sampled burbot, lake cisco, lake trout, lake and round whitefish, longnose and white sucker, and northern pike from the lake in 1967. Lake trout and lake whitefish from Nonacho Lake were also sampled in 1968, 1973 and 1986, and longnose sucker in 1968. In 1972, DFO conducted a limnological survey of the lake. Data were collected on the water chemistry, phytoplankton, zooplankton, and zoobenthos of the lake.
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From: Shannon Allerston To: Permits Subject: FW: NTPC v Carters: Taltson Compensation Re-hearing - Presentations Date: Friday, May 12, 2017 8:46:47 AM Attachments: Dean Carter presentation.pdf Dr. Bodaly presentation.pdf MV2011L4-0002 – Cartert Presentations for Compensation Claim Re-Hearing From: Jessica Buhler [mailto:File@mltaikins.com] Sent: May-11-17 4:34 PM To: Shannon Allerston Cc: Amanda Gauthier; sparker@mross.com; devanchuk@mross.com; sheldon@dragontoner.ca; caroline@dragontoner.ca; eolszewski@mltaikins.com Subject: NTPC v Carters: Taltson Compensation Re-hearing - Presentations Good afternoon Shannon, Please find below the link to access the Carters' presentations. Please note that the link will expire June 22, 2017. Please let me know if you have any questions or concerns. Regards, Jessica Buhler Lawyer P: (780) 969-3525 | C: (306) 381-5081 F: (780) 969-3549 | E: jbuhler@mltaikins.com MLT Aikins LLP
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