samples of soil of depth O — 3 cm were taken in the approximate area and 8 give values of 2900, 3550, c060, and 2290 dpm/g ; mean = 2700 dpm/e. profile data are available, so in order to calculate the total deposition we make the conservative 25sumption that no udditional 239Pu is below 3 cm. measured value of soil density in the area is 1.8 g/cm? v - deposition is 1.5 x 19 8 re apm/m” 0.052 dpm . m? No A Therefore, the and the resuspension factor is 2 m~ *T.5 x 109 dpm _ 3.x 10 -10 m Additional data were taken by REECo on the edge of the contaminated area during the period of February, 1971, to July, 1972, with a sample period of approximately 48 hours”. Measurements were made at four sites, but the site of most interest is the one in the prevailing direction of the strong winds. Here, 254 measurements were made of which 236 gave detectable results. Values range from 0.000077 to 1.4 dpn/m, with arithmetic and geometric means of 0.014 and 0.0018 dpm/m>, and a median of 0.0014 dpm/m>. Four soil activity values in the general vicinity are 128, 142, 172, and 202 dpm/g. The average ~~ deposition level, calculated as before is therefore 8.7 x 10° apm/m*, As most of the air activity samples were made over equal time periods, the arithmetic mean would be appropriate for deriving a resuspension factor: 2 Q.0lb 3 X em Bx 100 apm = -9 2x107/m The fact that the latter value is higher than the former may reflect one of the inherent difficulties in the resuspension factor approach; i.e., that no allowance is made of the geometrical configuration of the source and that higher ground activities are present at upwind locations.