Dames & Moore, 1999 - USDA Forest Service

June 15, 1998
Surface Water, May 1998, Holden Mine
Page 4
Manganese (0.04 ug/L) was detected in the method blank associated with the repreparation for
total analysis of samples HC-4, HC-3, HC-1, RC-11, Big-1, and CC-1. As manganese was detected at the
detection limit, results .reported in associated samples less than 5X the concentration in the blank are
qualified as not detected and flagged "U" accordingly. Results between 5X and 10X the concentration
detected in the method blank are qualified as estimated and flagged."JV accordingly. ' Results reported as
not detected or greater .than 10X the concentration detected in the method blank do not require
qualification.
Manganese (0.05 uglL) was detected in the method blank assoc~ated with the dissolved analysis
of RC-1, RC-4, RC-4X, RC-7, RC-5, RC-10, RC-3, RC-2, HC-4, HC-3, HC-2, HC-1, RC-11, BIG-1, CC-1,
CC-2, and RC-6 and the total analysis of EB050298, EB050398, and EB050598. Manganese results were
not detected or were greater than 1 OX the method blank concentration in all samples with the exception of
BIG-1. The result was less than 5X the method blank concentration and qualified as not detected and
flagged "U" accordingly. . .
Analytes of concern were detected in the equipment blanks as noted below.
Analyte Detection Limit EB050298 EB050398 EB050598
Barium 0.04 0.04 0.05 0.1 2
Copper 0.2 Not Detected Not Detected 0.4
Lead 0.2 0.4 Not Detected , 0.3
Sodium 50 50 50 Not Detected
,. . .. .. .
Each of the equipment blanks is associated to samples as follows: . ,
EB050298 -Tubing used for filtration of portal, ventilator portal, and seep samples.
EB050398 - Decon of nozzles and adaptors associated with surface water sampling. Note that the
additional equipment used for surface water sampling is generally dedicated to each individual station.
EB050598 - Ending decontamination blank for all sampling equipment used in the May 1998 sampling
event.
. Due to the low level detection of the metals shown, the p'roximity of the results to the detection
limits of the method, and the associated samples for each equipment blank,. the data does not clearly
show an additive effect related to the decontamination of equipment. Data were not qualified based on
the equipment blank results.
6. Internal'Standards (ICP MS analysis, only) - Acceptable
7. . ICP Interference Check (ICP'analysis orily) - Acceptable
8. Laboratory Control Sample - Acceptable
9. Laboratory Duplicate Sample
The laboratory duplicate performed on HC-3 (dissolved) was acceptable (within 20%) for all
elements except lead. The lead results were not detected and 0.8 ug/L. As the difference is
greater than the CRDL, associated sample results for lead reported greater than the detection
limit are qualified as estimated and flagged "J". Associated samples include dissolved analysis .
of HC-4, HC-3, HC-2, HC-1, RC-11, BIG-1, CC-1, CC-2, RC-6, RC-1, RC-4, RC-4X, RC-7, RC-5,
RC-10, RC-3, RC-2, EB050298, EB050398, and EB050598.