But several other possibilities are being explored, including contamination or defect during manufacturing, flaws in the design or construction of the battery, and problems with battery charging.
President Obama and the White House Council on Environmental Quality are committed to clean water, and want to reduce contaminants in drinking water, including contamination from improperly disposed medications.
It said several thousand people had died in accidents in ship-breaking yards over the past 20 years - not including deaths from long-term contamination.
Gerdes pointed out many instances when contamination could have occurred, including one in which Mazzola did not change her gloves between collection of two samples.
She said trace contamination with other animals - including pig and horse - could take place at abattoirs and processing plants dealing with more than one species "even with thorough cleaning and good hygiene practice".
Local people, including business owners, who were affected by the contamination will be given the opportunity to give evidence to the inquiry at a public meeting being held in the Council Chamber in the council offices in Margate on Thursday 11 October.
Chinese police have questioned 78 people -- including dairy farmers and milk dealers -- about the contamination, a Chinese official told Xinhua earlier Saturday.
Secretary Chu announced earlier today that the Department of Energy has offered and Japan has accepted an aerial measuring system capability, including detectors and analytical equipment used to provide assessments of contamination on the ground.
The company will further investigate the possible spread of contamination and its potential impact in the ocean, including the existence of beta radiation that could contain harmful strontium, company spokesman Yoshikazu Nagai said.
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