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J. H. KLEINFELDER & ASSOCIATES <br /> 1 <br /> 5 REPORT OF FINDINGS <br /> The findings of this study will be used in preparation of an HAR for <br /> submittal to the RWQCB and to establish clean up levels for SI closure. <br /> ' The "closure sample" analytical results will be utilized to establish <br /> statistical distributions of background concentrations for six metals of <br /> concern to DOHS. Background concentrations will be defined as the mean <br /> value of each metal plus two standard deviations, i.e. , background = x + <br /> ' 2S. Analytical results of confirmation samples obtained (during closure <br /> activities) from soil below the pond will be compared to these background <br /> ' values. Excavation will cease when the concentration of metals in <br /> confirmation samples are equivalent to background concentrations. <br /> ' Rational judgement will be used by the DOHS, RWQCB, and Kleinfelder during <br /> this comparison to assess if high concentrations are statistical outliers <br /> or are a result of contamination above background levels. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> ' 51-87-413 10 <br />