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			Your profile says Austin TX, how close to any of the fossil fuel power plants you have around Texas are you?  Carbonic, nitric and sulfuric acids are a problem you may be facing and could be a cause of what you are seeing.
 Back in 2006 the Texas Energy Commission was already warning about acid rain due to coal power plants back then.
 
				__________________When life throws you curves, aim for the apex...
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