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kn KLEINFELDER <br /> 1 <br /> 5 REPORT OF FINDINGS <br /> t <br /> The findings of this study will be used in preparation of an HAR for <br /> submittal to the RWQCB and to monitor clean up operations related to SI <br /> ' closure. <br /> ' Analytical results of previously collected closure samples will be <br /> utilized to establish statistical distributions of background <br /> I concentrations for six metals of concern to DOHS. Background <br /> ' concentrations will be defined as the mean value of each metal plus two <br /> standard deviations, i.e. , background = x + 2S. Analytical results of <br /> ' these and future confirmation samples obtained (during closure activities) <br /> from soil below the pond will be compared to the background values. <br /> ' Excavation will cease when the concentration of metals in confirmation <br /> samples are equivalent to background concentrations. Rational judgement <br /> will be used by the DOHS, RWQCB, and Kleinfelder during this comparison to <br /> assess if high concentrations are statistical outliers or are a result of <br /> contamination above background levels. <br /> 1 . <br /> 1 <br />