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Technical Memorandum12-21-2011 DEPcomm

Technical Memorandum12-21-2011 DEPcomm

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v Assessment of the Effects of Microseismicity A ssociated with Horizontal Drilling and HVHF on Existing Water Supply Tunnels # The vibrations from individual and multiple microseismic events generated due to routine HVHF activities are not likely to damage the tunnels.

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