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1 <br />ROCKY ]?I,ATS SOIL PLUTONILTM79290 SURVEYS FROM 1970 TO 1991 <br />r In order to visualize this data further, GIS Map 1 was produced displaying the median of the <br />entire record form 1970 to 1991. Map 1 uses four shades to display median values of the 1970 <br />to 1991 record for each sector: <br />0.000 to 0.1 pCl/gram, <br />' >0.1 to 0.5 pCi/gram <br />0.5 to 0.9 pCi/gram <br />>0.9 pCUgram <br />1 Colors are calibrated to each range. The color intensity corresponds to significant <br />increases in concentrations. The difference in the lowest to the highest concentrations is <br />roughly two magnitudes. The interval between the extremes is split into two equal <br />ranges. Each sector has been shaded according to the appropriate range to which it <br />belongs. <br />The ranges used to associate the values was selected roughly, but there is enough <br />distinction to illustrate the differences among medians for the sectors. The data for the <br />sectors lends itself fairly well to demonstrate the differences and similarities among the <br />sectors. <br />SE:ctor 2 is displayed prominently. Sector 2 is the only sector to stand out above the <br />standard. <br />SF:ctor 1 is the only sector to be within one multiple of the standard. <br />Sectors 4, 6 and 7 have elevated values, but are many multiples below the standard and <br />share a common shade. <br />Sectors 5, 8 through 13 are a magnitude below the standard and in general a magnitude <br />below the next closest range of sectors. <br />The graphs and map presentations produce similar results. Visually, they both provide a <br />compatible basis to consider segregating the area around Rocky Flats into four general <br />categories: <br />Category 1 An area of contamination in excess of the state plutonium standard of 0.9 <br />pCUgram of soil. This area includes Sector 2. <br />' <br /> 16 <br />gym .::........... .....:.:...:.. . <br /> <br />r <br />