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15,,V Dewberry <br /> R <br /> MEMORANDUM <br /> results . If engineered fill concentrations are less than the native soil concentrations , the engineered fill <br /> soil is uncompromised and no further sampling will be required . If this engineered fill sample is above <br /> native soil concentrations , then the corresponding backup intermediate sample will be analyzed . <br /> Closure Plan with Decision Tree <br /> RWQCB requested a sequence approach , based on site findings once the liner is removed from the <br /> impoundments . <br /> j <br /> i <br /> Clean Closure <br /> i <br /> ' i <br /> No Visual Impact Yes <br /> _ p _ <br /> Observed ? <br /> I % <br /> l <br /> I ` Sample <br /> Collection and r . Target <br /> Lab Analysis Excavation <br /> i <br /> i <br /> I <br /> i <br /> j <br /> No Fill Exceeds yes ' Intermediate Define Additional <br /> Y <br /> B Results <br /> Background ,,� � ,� SoAnalysis <br /> l m sle � � Sampling <br /> � g P <br /> Requirements <br /> Ir <br /> l <br /> I <br /> I <br /> I <br /> i <br /> r / I j <br /> 'I <br /> i <br /> No Fill Exceeds Yes <br /> Background <br /> Results ? rrZ <br /> � Impoundmentsh <br /> Clean Closed <br /> Figure - Iterative Closure Plan with Decision Tree <br />