Dames & Moore, 1999 - USDA Forest Service

I
June 15,1998
Field QC Samples, May 1998, Holden Mine
After data qualification, the following metals were detected in the filter blanks as noted below:
I Analvte Detection Limit Filter Blank #I Filter Blank #2
Aluminum
Barium
Cadmium
Manganese
4 U
0.04 ug/L
0.04 UQIL
0.04 ugk
Not Deteded
0.1 1 ug/L
Not Deteded
Not Deteded
The two filter blanks were collected from the same filter lot. Due to the proximity of the results to
the detection limit, the data does not clearly lndlcate an additive effect from the filters. In additlon, the
detection-limit reported for aluminum is below the project requirements. The filters were considered
acceptable for use during the May 1998 sampling event.
I 3. Laboratory Control Sample - Not Applicable
4. Laboratory Duplicate - Not Applicable
. ,.. A l'aboratory duplicate is not required fck fieldqualdy control samples.
I 5. Field Duplicate - Not Applicable
6; Matrix Spike - Not Applicable
. A inatrix spike is not required for field quality control samples.
7. Detedion Limits - Acceptable
8. Type of Review - Summary
9. Overall Assessment of Data
The usefulness of the data is based on EPA guidance documents listed above. Upon
conslderatlon of the information presented above, the data are acceptable except where flagged with
data qualifiers that modify the usefulness of the individual values
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.
R The sample results are rejected due to serious deficiencies in the ability to analyze the sample
and meet quality control criteria. The presence or absence of the analyte cannot be verified.