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In this 2008 photo provided by Temple University, Temple engineering ...

(AP) — Mon, 18 Jan 2010 04:36:27 GMT

(AP) - In this 2008 photo provided by Temple University, Temple engineering students dig one of numerous wells along the beach in Alaska. Over a total of six weeks during summers from 2007 to 2009, Michel C. Boufadel, chairman of the Department of Civil and Environmental Engineering, and his team dug about 70 pits between 3-feet and 5-feet deep on six beaches. An estimated 20,000 gallons of crude remain in Prince William Sound, even though oil remaining after the nearly 11-million-gallon Exxon Valdez oil spill had been expected to biodegrade and wash away within a few years. (AP Photo/Temple University) -- NO SALES --

Tugboats towing the oil tanker Exxon Valdez off Bligh Reef in ...

(AFP/File) — Sun, 17 Jan 2010 21:14:43 GMT

(AFP/File) - Tugboats towing the oil tanker Exxon Valdez off Bligh Reef in Prince William Sound for repair and salvage two weeks after the tanker ran aground in March 1989, spilling 11 million gallons of crude oil. Oil from the 1989 Exxon Valdez tanker spill that devastated Alaska's Prince William Sound still lies trapped beneath its beaches, continuing to pollute once pristine shores, scientists reported.(AFP/File/Chris Wilkins)

In this 2008 photo provided by Temple University, oi is seen ...

(AP) — Sun, 17 Jan 2010 20:06:02 GMT

(AP) - In this 2008 photo provided by Temple University, oi is seen in a well dug by Temple engineering students on a beach in Alaska. Over a total of six weeks during summers from 2007 to 2009, Michel C. Boufadel, chairman of the Department of Civil and Environmental Engineering, and his team dug aboaut 70 pits between 3-feet and 5-feet deep on six beaches. An estimated 20,000 gallons of crude remain in Prince William Sound, even though oil remaining after the nearly 11-million-gallon Exxon Valdez oil spill had been expected to biodegrade and wash away within a few years. (AP Photo/Courtesy of Temple University)

In this 2008 photo provided by Temple University, Michel C. ...

(AP) — Sun, 17 Jan 2010 20:01:08 GMT

(AP) - In this 2008 photo provided by Temple University, Michel C. Boufadel sets monitoring equipment along a beach in Prince William Sound, Alaska. An estimated 20,000 gallons of crude remain in Prince William Sound, even though oil remaining after the nearly 11-million-gallon Exxon Valdez oil spill had been expected to biodegrade and wash away within a few years. (AP Photo/Temple University)