Table 2. EPA Plutonium-239 Soil Sampling Results at Rocky Flats, Colorado, Special Samples Sampling Depth Mass/Area Site (cm) (g/cm*)a Concentration per Unit Area Individual Standard |Coeff. of |Concentration Results Mean Deviation} Variation (£Ci/g)b I -2l~a b c d e 0 tol " " " " 0.63 0.50 0.55 0.60 0.56 42 29 56 52 69 I -l-a b c d e 0 to 5 " " " " 4. 36 4.74 5.13 4.46 5.35 20 + <6, 9** 18 + 37 + 6.1 + GO to 5 " " " 6.69 2.15 5. 36 5.06 <7, 2k* 32 + 13. + 22 + III -14~a b c d e " 3.93 2 + 17 + 8x* +14 + 14 + 18 (nCi/m2)b (nCi/m?) (nCi/m) C 0.26 0.15 0.31 0.31 0.39 0.28 0.09 0.31 5 9 4.1 0.87 <0. 33 0.92 1.65 0.33 0.82 0.54 0.66 7 6 6 <0. 48 0.69 0. 70 1.11 0.69 0.26 | 0.37 5 + 4 0.47 DEPTH PROFILE SAMPLES I -16 -20 5 to 10 5 to 10 III -16 5 to 10 II 5.29 4,09 6 + <6.1 5 to 10 4.96 90 IV -16 5 to 10 IV Composite] 5 to 10 4.14 4.35 20 450 5.24 5**k + 12% 0. 32 0.25 4.44 6.14 5.3** 0.32 £ c + 40°** | | 0.83 ! Discounted a. Mass of material less than No. b. Error term for the fCi/g values is based on the 2-sigma coumting error term. An error term is not given for the unit area concentrations, but it would include the counting error, 10 mesh, divided by the sampled area. any error associated with the mass per area, and other errors mentioned in the text. c. Appears to be cross-contaminated in sampling, preparation, or analysis. * Average of two duplicates; error term is the counting error for the individual results. *k =Recounted for confirmation of results. 654