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Fuller Mobile Home Park <br />' 365 E. Louise Ave. <br /> Lathrop, California <br /> 1 <br />' Mass Balance Volume Calculations and Uncertainty Analysis <br /> sis <br /> 1.0 Volume Calculations <br />' The volume of soil was calculated by defining the contamination plume using the <br /> contamination cross-sections presented in the report (Figures 11 & 12) The areas of the <br /> cross-sections were calculated from the plots shown in Appendix Attachment E 1 The <br />' diameter of these cross-sections were rotated 360 degrees to produce a three dimensional <br /> image The areas of the rotated cross-sections were then calculated by Hd2/4, the area of <br /> a circle, where d = diameter The shapes of these plumes are long and flat (Appendix <br /> tAttachment E 2 & E 3), therefore an approximation of the average depth can be calculated <br /> by dividing the non-rotated area by the total length of the plumes cross-section <br />'. The volumes were calculated using the rotated areas and the average depths The <br /> volumes were assumed to be cylindrical shaped and the formula used was (ride/4)*average <br /> depth The volumes for the two contamination plume cross-sections were then averaged <br /> together to produce one average volume, which was used in the mass balance calculations <br />' 2.0 Uncertainty Analysis <br /> Since these are irregular shapes, the values given are only mathematical approximations <br /> As with any mathematical approximation, there is uncertainty, or error, inherent in the <br /> model result Error is introduced into this calculation due to limited data and through the <br /> modeler's assumptions Given that the concentrations of most of the contaminates are <br /> low, the error introduced would amount to insignificant changes in the mass of the <br /> contaminates <br /> I <br /> f <br />