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EPA has reviewed the proposed addition of lithium chloride as a flow tracer. The use of <br />lithium chloride is often used as an effective tracer in surface streams to access mixing <br />characteristics of gaining and losing reaches of the stream. Our review indicates that the <br />Lithium chloride is not hazardous and does not represent a threat to USDWs as long as it is <br />handled, mixed and used properly. The Permit has been modified with a Minor Modification to <br />allow injection of the lithium chloride tracer in the six wells listed above. <br />Addendum to the Statement of Basis-EPA FINAL PERMIT C03858-00000 Page 2 of 2 <br />