LAS VEGAS (AP) — Drilling a third Las Vegas drinking water supply line to the Lake Mead reservoir has hit another snag, this time in a connector tunnel.

The Las Vegas Review-Journal reports that Southern Nevada Water Authority officials are blaming unpredictable geology for unexpected amounts of water seeping into the area where the half-mile-long tunnel is being drilled 480 feet underground,

The authority board on Thursday added almost $5 million to the tunnel cost, and pushed back the target completion date about seven months, to January.

But they say it shouldn’t further delay completion of the overall $800 million project, which is already running about 20 months behind schedule.

Las Vegas depends on the Colorado River reservoir for about 90 percent of its drinking water supply.

© Copyright 2012 The Associated Press. All Rights Reserved.
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