Dames & Moore, 1999 - USDA Forest Service

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Dccember 8, 1998
Background Soil Data, Fall 1998, Holdcn Mine
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recovery (52.6%) in the SRM associated with samples DMBG-11, DMBG-12, DMBG-13, DMBG-14,
DMBG-15, DMBG-16, DMBG-17, DMBG-18, and DMBG-19 was below the typical LCS control limits of
80 to 120%. However, the recovery was within the advisory range published by the supplier. Uranium
was inadvertently omitted from SRM or LCS analysis.
Data qualifiers were not assigned to aluminum or calcium results as the recoveries from the
SRM were within published advisory ranges. Uranium results were not qualified as the associated matrix
1 spike results were acceptable.
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9. Laboratory Duplicate Sample
A laboratory duplicate was performed on sample DMBG-10. The relative percent difference for
chromium was 26.6 %, above the method criteria of 20%. Chromium results reported above the
detection limit in associated samples are qualified as estimated and flagged "J" accordingly.
Results reported as not detected do not require qualification. Associated samples include DMBG-1,
DMBG-2, DMBG-3, DMBG-4, DMBG-5, DMBG-6, DMBG-7, DMBG-8, DMBG-9, DMBG-10, and
DMBG-1 OX.
1 A laboratory duplicate was performed'on sample DMBG-16. The relative percent difference for
I manganese was 20.8%, slightly above the method criteria of 20%. Manganese results reported above
the detection limit in associated samples are qualified as estimated and flagged 'J" accordingly. Results
1 reported as not detected do not require qualification. Associated samples include DMBG-11, DMBG-12,
DMBG-13, DMBG-14, DMBG-15, DMBG-16, DMBG-17, DMBG-18, and DMBG-19.
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1 @ 10- Field Duplicate - Acceptable
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1 .#*..
1 ' ,
11. Matrix Spike
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A field duplicate .for DMBG-10 was submitted and labeled DMBG-1OX. Duplicate results were
comparable to the original sample results.
A matrix spike was performed on sample DMBG-10. The recovery for iron (47.4%) was outside
of the control limits (75-125%). The concentration of iron (10,400 mglkg) in the sample exceeded the
spiking concentration by greater than 4X. Data qualification was not required.
A matrix spike was performed on sample DMBG-16. The recovery for aluminum (199%), iron
(181%), and manganese (137%) were outside of the method control limits (75-125%). The concentration
of aluminum (11,200 mglkg), iron (10,500 mglkg), and manganese (1,160 mglkg) in the sample
exceeded the spiking concentration by greater than 4X. Data qualification was not required.
I 12. Graphite Furnace Atomic Absorption QC - Acceptable
13. ICP Serial Dilution (ICP analysis only) - Acceptable
1 14. Detection Limits - Acceptable
15. Type of Review - Summary
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16. Overall Assessment of Data
The usefulness of the data is based on EPA guidance documents listed above. Upon
consideration of the information presented above, the data are acceptable except where flagged with
data qualifiers that modify the usefulness of the individual values.
I g:/holden/l998/datavallvalY962.doc DAMES & MOORE