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The 3.0 temblor was reported at 3:42 p.m. at a depth of 1.1 miles, according to the US Geological Survey.
The quake was centered two miles west southwest of Anderson Springs and five miles east southeast of The Geysers, the US Geological Survey reported.
Only two reports were made to the US Geological Survey by those who felt the quake – one in Guerneville, the other in San Carlos.
The US Geological Survey takes special note of earthquakes measuring 3.0 on the Richter Scale and above. The last quake above 3.0 to shake the county was a 4.1 on Feb. 23.
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Under the Safe Drinking Water Act, EPA includes on the draft Contaminant Candidate List (CCL) currently unregulated contaminants that are known or anticipated to occur in public water systems and which may require regulation.
This draft CCL, which is the third such listing, lists 93 chemical contaminants or groups and 11 microbes, and describes the process and basis for selecting these contaminants.
"EPA is casting a broader scientific net for potential regulation of chemicals and microbes in drinking water," said Assistant Administrator for Water Benjamin H. Grumbles. "EPA's proposed list of priority contaminants will advance sound science and public health by targeting research on certain chemicals and microbes and informing regulators on how best to reduce risk."
The CCL process was established by the 1996 Amendments to the Safe Drinking Water Act as a mechanism to determine if new regulations are needed to protect drinking water.
Under this process EPA conducts extensive research into the occurrence and health effects of the listed contaminants before issuing new regulations or standards.
In developing the draft CCL 3, the agency implemented a new approach for selecting contaminants which builds upon evaluations used for previous lists and is based on substantial expert input early in the process and recommendations from a larger number of different groups including stakeholders, the National Research Council and the National Drinking Water Advisory Council.
The draft list includes chemicals used in commerce, pesticides, biological toxins, disinfection byproducts, and waterborne pathogens.
The agency evaluated approximately 7,500 chemicals and microbes and selected 104 candidates for the final draft list based on their potential to pose health risks through drinking water exposure.
The comment period is open for 90 days beginning the day of publication in the Federal Register.
For information on the CCL 3 visit www.epa.gov/safewater/ccl/ccl3.html.
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