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GLOSSARY OF TERMS Q2 2006 through Q2 2008 Annual Mercury Average Below is the average of four consecutive quarterly mercury tests conducted at Wheelabrator, North Andover between Apr-06 and Jul-08 These tests were coordinated with the Massachusetts Department of Environmental Protection. If you have any questions about the test results, please feel free to contact us at 978-688-9011 during normal business hours. Four Quarter Average Mercury Parameter Limit Results* Mercury (Hg) 0.028 milligrams per dry standard cubic meter (mg/dscm) corrected to 7% O2 for four consecutive quarters * All result's units are as specified in "Limits" column.

Wheelabrator North Andover 285 Holt Rd. North Andover, Massachusetts, U.S. 01845 Tel: 978.688.9011 Copyright © Wheelabrator North Andover