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El CM, <br /> Stockton Scavenger Association Facility <br /> November, 1997 <br /> Page 8 <br /> Toluene, ethylbenzene, and xylenes concentrations were steady during operation of the pump and <br /> treat system between April 1994 and April 1996, however, large reductions also occurred between <br /> April 1996 and July 1997 Benzene is the only analysis parameter that exceeds the California <br />' Department of Health Services Primary Maximum Contaminant Level (MCL) <br />' 5.3 Projected Effectiveness <br /> Based on the latest groundwater monitoring results, continued operation of the groundwater pump <br /> and treat system would result in mass removal rates of less than 0 02 pounds per month TPHg and <br />' approximately 0 01 pounds per month benzene These calculations are included in Attachment C <br /> These projected mass removal rates are less than 0 2 and 0 4 percent of the total pounds of TPHg <br /> and benzene removed to date Based on this evaluation, the pump and treat system has reached a <br />' point of limited continued effectiveness <br /> 1 <br /> 5027002 ART <br />