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Thesis-Anne-Vos-Masters-SBR-and-EU-Law-3

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from the U.S. experience that 6% of the wells leak. 51 However, it should be kept in mind that these<br />

risks could be managed <strong>and</strong> controlled: sites should carefully be selected, pipes <strong>and</strong> wells should<br />

be properly sealed <strong>and</strong> insulated from the geological formation, etc. But, this is not yet proven<br />

successfully <strong>and</strong> the risks or concerns should not be regarded as acceptable, only because they<br />

may be managed in the future. Then again, it should be mentioned here that those risks are not<br />

specific to shale gas extraction. However, those risks are magnified by the volume of the water<br />

used during the process. 52 This is the next concern regarding water.<br />

With regard to water there is next to the contamination fears, also the concern about the large<br />

amounts of water consumed. One well uses around 15,000 m3 of water during the (horizontal)<br />

drilling process <strong>and</strong> 11,000 m3 of water (as part of the mixture in the fracture fluids) during the<br />

hydraulic fracturing process. From the latter, 57-227 m3 of the fluid consists of chemical additives.<br />

Moreover (as stated), the fracturing fluid stays for circa 25-90% in the soil after injected. 53 This<br />

water will not take part anymore in the 'hydrologic cycle'. 54 Generally a shale gas-site is around 2-<br />

hectare which will accommodate 6-8 wells that all extract areas of around 1-2 km2. 55 Hence, the<br />

volume of water used is enormous, particularly compared to conventional resources. In North<br />

America, most of the operators used local water since the transport of water is very expensive. 56<br />

This volume of water used in the process, especially in areas where there is water scarcity, could<br />

"lower the water table, affect biodiversity <strong>and</strong> harm the local ecosystem. It can also reduce the<br />

availability of water for use by local communities <strong>and</strong> other productive activities, such as agriculture.<br />

And all more so if this takes place in areas where other energy sources are already drawing on the<br />

available water." 57<br />

Here, water management plans might help by mitigating, preventing <strong>and</strong> controlling those effects<br />

<strong>and</strong> ensure efficiency of the used water. 58 But again: still large amounts of water are needed.<br />

2.3.1.2 Air emissions<br />

During the process of the shale gas exploitation, but also due to the needed transport, fugitive<br />

methane emissions can arise which could lead to air pollution <strong>and</strong> greenhouse gas (GHG)<br />

emissions. This could have adverse effects for the local air quality <strong>and</strong> climate surrounding the site.<br />

In the US such emissions have been reported during shale gas extractions. The Commission notes<br />

that these emissions may be prevented <strong>and</strong> mitigated by good practices. 59 If not, the GHG<br />

emissions per electricity unit (generated by shale gas) would be 4-8% higher than per electricity<br />

unit generated by conventional resources. 60 This could be explained by two reasons. First, the<br />

techniques used for shale gas extraction require heavy diesel engines. 61 Second, together with the<br />

flow-back water arises the emission of 'encapsulated gas' of which methane is the main<br />

component. Methane is a more powerful GHG than carbon dioxide. This emission may however be<br />

mitigated or removed if separators are used at the wellhead. 62<br />

51<br />

Draft Opinion of the Committee of the Regions, Local <strong>and</strong> regional authorities perspective on shale/tight gas <strong>and</strong> oil<br />

(unconventional hydrocarbons), 103 rd plenary session, 7-9 October 2013, p. 7.<br />

52<br />

Buchan (2013), pp. 5-6; see also IEA Golden Rules Report (2012), p. 35.<br />

53<br />

Commission Communication (2014), p. 6.<br />

54<br />

Commission Staff Working Document Impact Assessment (2014), part 1/4, p. 26.<br />

55<br />

Legal Assessment (2012), p. 3.<br />

56<br />

Commission Staff Working Document Impact Assessment (2014), part 4/4, p. 8.<br />

57<br />

Commission Staff Working Document Impact Assessment (2014), part 1/4, p. 25; IEA Golden Rules Report (2012), pp.<br />

31-32.<br />

58<br />

Commission Communication (2014), p. 6.<br />

59<br />

Commission Communication (2014), pp. 6-7.<br />

60<br />

Commission Staff Working Document Impact Assessment (2014), part 1/4, p. 25.<br />

61<br />

Golden Rules Report (2012), p. 38.<br />

62<br />

Buchan (2013), p. 6.<br />

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