Study finds acidic mud at Kidder Point

Local group calls for action   By Jordan Bailey | Jun 25, 2014

Photo by: Jordan Bailey
Friends of Penobscot Bay President Ron Huber points toward one of the areas where low pH was measured.
 Searsport — A study by Dr. Mark Green, environmental science professor at St. Joseph’s College in Standish and ocean acidification expert, found sediment along the shore on the western side of Kidder Point in Searsport to be “extremely acidic,” and a local group is calling for federal agencies to investigate the site.

At the request of Friends of Penobscot Bay, pH of mud was measured at 22 sites on the east side of Sears Island and the west side of Kidder Point. Green reported one location measuring a pH of 1.4 and the rest ranged from 4.55 to 7.15. The average of all the sample measurements was 6.03. Sediments with pH measurements in the 6’s and below, Green said in his April 9 report on the study, should be considered incapable of supporting any marine life. In a quick microscopic analysis of the sediments tested, he said he did not see evidence of any of the microscopic organisms that are usually ubiquitous in coastal mud.

The report concluded, “Results presented here clearly demonstrate a significant anthropogenic acid source and should merit concern for the well-being of local residents in contact with these sediments, recreation in the immediate area and wildlife.” Green also expressed the concern in a message sent with the report that metals that would normally be locked in sediment particles could be mobilized by the acidity of the environment.

At a meeting with The Journal April 18 for a previous article, GAC President David Colter and GAC’s environmental consultant John Pond of CES Inc. explained that GAC has a fully implemented Stormwater Pollution Prevention Plan by which stormwater is treated because of wastes present at the site from its historic uses.

“If GAC wasn’t here,” Pond said, “the stormwater would be running off  pollution into the bay.”

However, Green stated in his report, “Based on the proximity of these stations to the phosphogypsum waste area at Kidder Point there is little doubt that these deposits are being severely impacted by runoff at the adjacent shoreline.”


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