10 TTT TTT - TT TTT TTT TTT GT TTY @ Duplicates overlap within2 o: © Duplicates fail to overlap within2 o 1.0E- q J O ~- ao > S a oO gf < 8 2 = < 0.1-- v. ~y 1 z :4 one ft p Co & 4 oO 4 Cr / ° 0.01 Ea y/ a — | 7 — / / 7 7 se 43 5 a 4 7 — 4 7 0.00171 0.001 sp iil 0.01 Let tii l 0.1 bet pail 1.0 tet tail 10 bop 100 Aliquot B (pCi/g) Figure A2. Acceptable quality contro! results for duplicate pairs analyzed for 90Sr in soil by Environmental Analysis Laboratory. Results depicted are for concentrations between { x 10°3 and 10 pCi/g. Broken line represents perfect agreement and is not a fit to the data. 30