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Dames & Moore, 1999 - USDA Forest Service

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June 15, 1998<br />

Surface Water, May 1998, Holden Mine<br />

Page 4<br />

Manganese (0.04 ug/L) was detected in the method blank associated with the repreparation for<br />

total analysis of samples HC-4, HC-3, HC-1, RC-11, Big-1, and CC-1. As manganese was detected at the<br />

detection limit, results .reported in associated samples less than 5X the concentration in the blank are<br />

qualified as not detected and flagged "U" accordingly. Results between 5X and 10X the concentration<br />

detected in the method blank are qualified as estimated and flagged."JV accordingly. ' Results reported as<br />

not detected or greater .than 10X the concentration detected in the method blank do not require<br />

qualification.<br />

Manganese (0.05 uglL) was detected in the method blank assoc~ated with the dissolved analysis<br />

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,<br />

CC-2, and RC-6 and the total analysis of EB050298, EB050398, and EB050598. Manganese results were<br />

not detected or were greater than 1 OX the method blank concentration in all samples with the exception of<br />

BIG-1. The result was less than 5X the method blank concentration and qualified as not detected and<br />

flagged "U" accordingly. . .<br />

Analytes of concern were detected in the equipment blanks as noted below.<br />

Analyte Detection Limit EB050298 EB050398 EB050598<br />

Barium 0.04 0.04 0.05 0.1 2<br />

Copper 0.2 Not Detected Not Detected 0.4<br />

Lead 0.2 0.4 Not Detected , 0.3<br />

Sodium 50 50 50 Not Detected<br />

,. . .. .. .<br />

Each of the equipment blanks is associated to samples as follows: . ,<br />

EB050298 -Tubing used for filtration of portal, ventilator portal, and seep samples.<br />

EB050398 - Decon of nozzles and adaptors associated with surface water sampling. Note that the<br />

additional equipment used for surface water sampling is generally dedicated to each individual station.<br />

EB050598 - Ending decontamination blank for all sampling equipment used in the May 1998 sampling<br />

event.<br />

. Due to the low level detection of the metals shown, the p'roximity of the results to the detection<br />

limits of the method, and the associated samples for each equipment blank,. the data does not clearly<br />

show an additive effect related to the decontamination of equipment. Data were not qualified based on<br />

the equipment blank results.<br />

6. Internal'Standards (ICP MS analysis, only) - Acceptable<br />

7. . ICP Interference Check (ICP'analysis orily) - Acceptable<br />

8. Laboratory Control Sample - Acceptable<br />

9. Laboratory Duplicate Sample<br />

The laboratory duplicate performed on HC-3 (dissolved) was acceptable (within 20%) for all<br />

elements except lead. The lead results were not detected and 0.8 ug/L. As the difference is<br />

greater than the CRDL, associated sample results for lead reported greater than the detection<br />

limit are qualified as estimated and flagged "J". Associated samples include dissolved analysis .<br />

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,<br />

RC-10, RC-3, RC-2, EB050298, EB050398, and EB050598.

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