Dames & Moore, 1999 - USDA Forest Service

June 25, 1998
Ventilator Portal, June 1998, Holden Mine
Page 2
concentration in the blank.are qualified as not detected and flagged "U" accordingly. Results between 5X
and 10X the concentrations detected in the method blank are qualified as estimated and flagged "J" ,
accordingly. Results reported as not detected or greater than 10X the concentration detected in the
method blank do not require qualification.
6. Internal Standards (ICP MS analysis only) - Acceptable
7. ICP Interference Check (ICP analysis only) -Acceptable
8. Laboratory Control Sample - Acceptable
9. Laboratory Duplicate Sample - Not Applicable
A laboratory duplicate was not performed due to the limited number of samples.
10. Field Duplicate - Not Applicable
1 1. Matrix Spike - Not Applicable
A matrix spike was not performed due to the limited number of samples.
12. . ICP Serial Dilution (ICP analysis only) - Acceptable
13. Detection Liniits - Acceptable
14. Type of Review - Summary
15. 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.
The result for dissolved zinc is reported as 41 1 ugIL; however, the zinc concentration reported for
the total fraction is 4 ug1L. The ICP raw data was reviewed for calculations and no errors were identified.
The laboratory analyzed a serial dilution on the dissolved fraction, reanalyzed dissolved fraction directly
from the original sample container, and reviewed calculations. No errors were identified and the
reanalyses of the dilutions and additional sample resulted in concentrations similar to 411 ugIL. This
result appears to be an anomaly and should be considered as such during data evaluation and use.
Data Qualifiers
. U The analyte was analyzed for, but was not detected above the reported sample quantitation limit.
J The analyte. was positively identified; the associated numerical value is the approximate
concentration of the analyte in the sample. '
UJ The analyte was not detected above the reported sample quantitation limit. However, the
reported quantitation limit is approximate and may or may not represent the actual limit of
quantitation necessary to accurately and precisely measure the analyte in the sample.