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Dames & Moore, 1999 - USDA Forest Service

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June 8,1998<br />

Equipment Blank, May 1998, Holden Mine<br />

Page 2<br />

accordingly. Results reported as not deteded or greater than 1OX the concentration detected in the<br />

method blank do not require qualification.<br />

The following metals were detected in the equipment blank (Ef3-05-PM): copper (0.4 ug/L), iron<br />

(30 ug/L), and zinc (6 ug/L). Aluminum (30 ugIL), barium (0.08 ug/L), calcium (70 ug/L), lead (0.3 uglL),<br />

and manganese (0.15 ug/L) were also detected in the equipment blank but qualified as not deteded<br />

based on the method blank resutts. The equipment blank is associated with the equipment used for<br />

collection of seep and portal samples during the May sampling event. Copper, iron, and zinc in seep and<br />

portal samples were not detected or detected at concentrations greater than 10X the equipment blank<br />

with the exception of dissolved copper (0.7 uglL) in sample VP-1. However, the total copper<br />

concentration for VP-1 (9.6 ugR) was greater than 1OX the equipment blank. The low-level detection of<br />

copper, iron, and zinc in the equipment blank combined with the high concentrations of these metals<br />

detected in associated samples indicate that the sampling equipment for the seepiportal samples did not<br />

measurably affect the data. Associated data were not qualified based on equipment blank results.<br />

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

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

8. . Laboratory Control Sample - Acceptable<br />

9. Laboratory Duplicate Sample - Not Applicable<br />

A laboratory duplicate is not required for equipment blanks.<br />

10. Field Duplicate,- Not Applicable<br />

11. Matrix Spike - Not Applicable<br />

A matrix spike is not required for equipment blanks.<br />

12. ICP Serial Dilution (ICP analysis only) - Acceptable<br />

13. '<br />

Detection Limits - Acceptable<br />

14. Type of Review - Summary<br />

15. Overall Assessment of Data<br />

The usefulness of the data is based on EPA guidance documents listed above. Upon<br />

consideration of the information presented above, the data are acceptable except where flagged with<br />

data qualifiers that modify the usefulness of the individual values.<br />

Data Qualifiers<br />

U The analyte.was analyzed for, but was not detected above the reported sample quantitation limit.<br />

J he analyte was positively identified; the associated numerical value is the approximate<br />

concentration of the analyte in the sample.

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