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            <gco:CharacterString>Acid-Sensitive Lakes

Nine hundred and thirty-three lakes located in Saskatchewan, Alberta and the Northwest Territories were sampled to establish current acidification status. Of the 933 lakes, 244 (or 26%) are considered acid sensitive, almost always because of naturally low calcium and magnesium (or "base cation") concentrations. The most acid-sensitive lakes (i.e., those with extremely low base cation concentrations) are located on the Canadian Shield in both Alberta and Saskatchewan and east of the oils sands development area.

Fifty-one of the 244 acid-sensitive lakes were sampled twice annually (spring and fall) to identify chemical changes through trend analyses. Results revealed that 55% of these lakes had concentrations of some metals in excess of Canadian Council of Ministers of the Environment guidelines. Of the 291 samples taken in the 51 lakes, iron concentrations were greater than guidelines in 36% (105 samples), aluminum in 33% (97 samples), lead in 0.3% (1 sample) and copper in 0.3% (1 sample). The metals in these lakes occur naturally and are expected to be found in a wide range of concentrations given the geology and physiography of the Canadian Shield. It remains to establish the relationship between acid sensitivity, geology and high metal concentrations.</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#fra">Lacs sensibles aux acides

Neuf cent trente-trois lacs situés en Saskatchewan, en Alberta et dans les Territoires du Nord-Ouest ont été échantillonnés dans le but d’établir l’état d’acidification actuel. Des 933 lacs, 244 (ou 26 %) sont considérés comme sensibles aux acides, presque toujours en raison des faibles concentrations naturelles de calcium et de magnésium (ou « cation basique »). Les lacs les plus sensibles à l’acidité (c.-à-d. ceux qui présentent des concentrations en cations basiques extrêmement faibles) sont situés sur le Bouclier canadien en Alberta et en Saskatchewan, à l’est de la zone d’exploitation des sables bitumineux.

Cinquante et un des 244 lacs sensibles aux acides ont été échantillonnés deux fois par année (au printemps et à l’automne) afin de déterminer les changements chimiques au moyen d’analyses des tendances. Les résultats ont montré que 55 % de ces lacs avaient des concentrations de certains métaux supérieures aux recommandations du Conseil canadien des ministres de l’Environnement. Sur les 291 échantillons prélevés dans les 51 lacs, les concentrations de fer étaient supérieures aux recommandations dans 36 % des cas (105 échantillons), celles de l’aluminium dans 33 % (97 échantillons), du plomb dans 0,3 % (1 échantillon) et du cuivre dans 0,3 % (1 échantillon). Dans ces lacs les métaux sont tous d’origine naturelle, et il est donc normal que leur concentration soit extrêmement diversifiée en raison de la géologie et de la physiographie du Bouclier canadien. La relation entre la sensibilité à l’acidité, la géologie et les fortes concentrations en métaux reste à établir.</gmd:LocalisedCharacterString>
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The goal of the air deposition monitoring program is to provide the necessary data to address the following questions:

1. What is the direct atmospheric deposition of key contaminants to the surface of the Athabasca River and its tributaries?

2. What is the atmospheric deposition to the landscape and acid-sensitive lakes in the Lower Athabasca basin?

3. How does the atmospheric deposition affect water quality in the lakes, tributaries and mainstem?

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Canada-Alberta Oil Sands Environmental Monitoring</gco:CharacterString>
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3. Comment les dépôts atmosphériques nuisent-ils à la qualité de l’eau dans les lacs, les affluents et le tronçon principal?"

Soutien aux projets : 
Canada-Alberta sur la surveillance environnemental visant les sables bitumineux</gmd:LocalisedCharacterString>
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