Five acres of a salt-water harbor in British Columbia near a decommissioned oil processing site were monitored for groundwater seeps.   Three 2,000-meter cables were installed, spanning 300 meters of shoreline and extending 75 meters into the harbor.  The DTS investigation identified a number of key locations for further testing.   Four-meter tidal fluctuations created installation challenges, but the cyclical pressure dynamics associated with each tide cycle highlighted possible seeps.