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KLEINFELDER <br /> 12) Reasons why background was/as unattainable using BAT, <br /> MTBE does not occur naturally; therefore, background levels were not achieved. Although <br /> MTBE concentrations in the groundwater meet the water quality objective, residual <br /> concentrations are present in the groundwater. MTBE was detected at 1.7 uglL in MW-2 <br /> during the January 2005 monitoring event With time, residual MTBE should continue to <br /> naturally attenuate and degrade <br /> i <br />� 1 <br /> 1 <br /> M <br /> I <br /> I <br /> I <br /> 1 <br /> i <br /> 1 <br /> • <br /> I <br /> 49014-1/SAC5R423 Page 13 of 17 June 30, 2005 <br /> ' Copynght 2005 Kleinfelder,Inc <br />